Ohio Care Plus Series 3000 / 4000 Operation and Maintenance Manual Rev ZAB

User Responsibility This Product will perform in conformity with the description thereof contained in this operating manual and accompanying labels and/or inserts, when assembled, operated, maintained and repaired in accordance with the instructions provided. This Product must be checked periodically. A defective Product should not be used. Parts that are broken, missing, plainly worn, distorted or contaminated should be replaced immediately. Should such repair or replacement become necessary, Ohmeda recommends that a telephone or written request for service advice be made to the nearest Ohmeda Regional Service Center. This Product or any of its parts should not be repaired other than in accordance with written instructions provided by Ohmeda and by Ohmeda trained personnel. The Product must not be altered without the prior written approval of Ohmeda’s Quality Assurance Department. The user of this Product shall have the sole responsibility for any malfunction which results from improper use, faulty maintenance, improper repair, damage, or alteration by anyone other than Ohmeda. Important

This manual is subject to periodic review. Customers are cautioned to obtain and consult the latest manual revision. Suggestions are also invited from customers for consideration by Ohmeda in connection with these periodic reviews. Customers may contact product service at 1-800-345-2755 or by writing to Ohmeda at P.O. Box 7550, Madison, WI 53707.

CAUTION

U.S. Federal and Canadian law restrict this device to sale by or on the order of a licensed medical practitioner.

ii ii

Table of Contents General Precautions Warnings ... iv Cautions ... iv

1/Introduction Introducing the Ohio® Care Plus® Incubator... 1-1 The Elevating Base accessory... 1-2 Adding a rail system or storage module... 1-2 How to use this manual... 1-3

2/Getting Started Unpacking ... 2-1 Mounting the Care Plus on the Elevating Base ... 2-2 Mounting the Care Plus on the cabinet ... 2-3 Mounting the rail system on the cabinet ... 2-4 Mounting the basic rails ... 2-4 Mounting the overhead shelf ... 2-5

3/General Information Operating modes ... 3-1 The air control (manual) mode ... 3-1 The patient control (servo) mode ... 3-2 Controls and displays ... 3-4 Alarms ... 3-6 Cable connections and mechanical controls ...3-10

4/Preoperative Checkout Procedure Mechanical checks ... 4-1 Accessory checks ... 4-3 Controller checks ... 4-3 Operational checks ... 4-6 Elevating Base and Stationary Pedestal Checkout Procedure... 4-6 Operating the Elevating Base... 4-8

5/Using the Incubator Basic operating procedure ... 5-2 Responding to alarms ... 5-5 Air circulation alarm ... 5-6 Control temperature alarm ... 5-6 High air temperature alarm ... 5-6 Patient temperature alarm ... 5-7 Probe failure alarm ... 5-7 Power failure alarm ... 5-8 System failure alarm ... 5-8 Additional operating procedures ... 5-8 Accessing the patient ... 5-8 i i

Table of Contents Raising and lowering the hood ...5-10 Trendelenburg and Reverse Trendelenburg positioning – tilt handle models...5-11 Trendelenburg and Reverse Trendelenburg positioning – continuous tilt models ...5-12 Administering oxygen ...5-12 Using the humidifier ...5-14 ThermaLink Option ...5-15 Using the Serial Data interface ...5-16 Using the Nurse Call System interface ...5-16

6/Maintaining the Incubator Cleaning schedule ... 6-1 Disassembling the incubator for a complete cleaning ... 6-2 Cleaning and disinfecting individual components ... 6-5 Humidifier ... 6-6 Patient Probe ... 6-6 Controller assembly ... 6-7 Portholes ... 6-8 Compartment Temperature Probe... 6-8 Other Clear plastic parts ... 6-8 Lower unit (mattress, mattress tray, base platform cover, etc.)... 6-8 Oxygen inlet ... 6-8 Cabinet ... 6-8

7/Service Procedures Repair policy ... 7-1 Maintenance schedule... 7-1 Operator maintenance... 7-1 Service maintenance... 7-2 Troubleshooting incubator problems ... 7-2

8/Maintenance Parts and Accessories Base platform and cover assembly ... 8-1 Accessories ... 8-2

Appendix Care Plus specifications ...A-1 Electrical specifications ...A-1 Performance specifications ...A-2 Safety specifications ...A-4 Environmental specifications ...A-4 Electromagnetic Compatibility (EMC) Specifications ...A-4 Mechanical specifications ...A-5 Optional Elevating Base pecifications...A-5 ThermaLink Option Specifications ...A-6 A. Hewlett Packard CMS Monitor (Vuelink)...A-6 B. SpaceLabs Monitor (Flexport)...A-6 C. RS-232 Serial Data ...A-6 D. Nurse Call ...A-9 Additional Safety Information ... A-11 Glossary ... A-12

Warranty ii ii

Table of Precautions General Contents Warnings Before using the incubator, read through this entire manual. As with all medical equipment, attempting to use this device without a thorough understanding of its operation may result in patient or user injury. This device should only be operated by personnel trained in its operation under the direction of qualified medical personnel familiar with the risks and benefits of this type of device. Additional precautions specific to certain procedures are found in the text of this manual. Complete the “Pre-operative Checkout Procedures” section of this manual before putting the unit into operation. If the incubator fails any portion of the checkout procedure it must be removed from use and repaired. Do not use the Care Plus or the Elevating Base in the presence of flammable anesthetics; an explosion hazard exists under these conditions. Always disconnect the power before performing service or maintenance procedures detailed in this manual. Apply power only if you are specifically instructed to do so as part of the procedure. Thoroughly air dry the incubator after cleaning it with flammable agents. Small amounts of flammable agents, such as ether, alcohol or similar cleaning solvents left in the incubator can cause a fire.

Cautions Only competent individuals trained in the repair of this equipment should attempt to service it as detailed in the Service Manual (Stock Number 6600-0017-000). Detailed information for more extensive repairs is included in the service manual solely for the convenience of users having proper knowledge, tools and test equipment, and for service representatives trained by Ohmeda.

iii iii

Table of Contents Notes

iv iv

1/Introduction In this section Introducing the Ohio® Care Plus® Incubator... 1-1 The Elevating Base accessory... 1-2 Adding a rail system or storage module... 1-2 How to use this manual... 1-3

Introducing the Ohio Care Plus Incubator Thank you for selecting the Ohio Care Plus Incubator. The Care Plus adapts to your patient’s needs with: servo and manual operating modes; a built-in passive humidifier; an oxygen inlet; removable inner walls; a model with three or six degree bed positions or a continous tilt model with bed positions from zero to twelve degrees. The Care Plus Access Incubator provides a larger hood for greater patient access and two additional tubing access ports. The Optional ThermaLink feature simplifies charting and monitoring. RS-232 serial data is provided for use with customized research software or compatible vital signs monitors. The Nurse Call connection lets you integrate the Care Plus into your current or future remote alarm system. From its comprehensive series of alarms and quiet operation, to unique oval portholes for greater lateral access, the Care Plus offers both security and convenience. Its familiar styling integrates into the existing nursery environment with a rail mounting system that accommodates most Ohmeda rail mount accessories. Options, such as single or double walls, an adjustable height stand with or without storage units and a servocontrolled humidifier, let you select the system best suited to your needs.

CI.07.038

Ohio® Care Plus® Incubator is a registered trademark of Ohmeda.

Figure 1-1 The Ohio Care Plus Incubator 1-1 1-1

1/Introduction Care Plus technology The Care Plus combines microprocessor technology, a unique hood design with front to back air flow, and an integral humidifier to stabilize patient temperature: • The microprocessor responds immediately to temperature changes, minimizing the temperature fluctuations of older, analog incubators. • Heated air circulated along the hood wall, or between the optional double walled hood, warms the surfaces surrounding the infant, reducing radiant heat loss. • Limiting air movement around the infant reduces convective and evaporative heat loss. Humidifying the air further reduces evaporative heat loss. WARNING

Before using the Ohio Care Plus Incubator, read through this entire manual. As with all medical equipment, attempting to use this device without a thorough understanding of its operation may result in patient or user injury.

The Elevating Base accessory

CI.07.003

The Elevating Base lets you adjust the Care Plus Incubator to the height that is most comfortable for you. The mattress can be as low as 85 cm (34 inches) or as high as 107 cm (42 inches) above the ground. The foot pedal controls leave your hands free to care for the patient.

Figure 1-2 Different elevations

Adding a rail system or storage module Optional storage units and rail systems provide convenient storage for the Elevating Base and keep accessories nearby. Rail systems are also available for cabinet mounted incubators. Each of the Care Plus configurations accommodates Ohmeda’s dove-tail rail systems. Rail systems expand with your needs to support a full range of patient care accessories.

1-2 1-2

1/Introduction How to use this manual This manual serves both as a guide to learn how to operate the Care Plus and as reference once you are familiar with the Care Plus. If you are setting up the system for the first time, read all the sections starting with Chapter 2, “Getting Started,” which contains unpacking, assembly, and accessory mounting information. If the Care Plus is already in place and this is the first time you have used it, start with Chapter 3, “General Information.” If you have used the Care Plus previously, complete the step-by-step checkout procedure in Chapter 4, which is required before using the incubator. Then turn to Chapter 5 “Using the Incubator.” This manual includes instructions for a new continuous bed tilt model, so even if you have used the Care Plus before, you should acquaint yourself with new operation and check procedures concerning this new model. Before cleaning the Care Plus, read Chapter 6, “Maintaining the Incubator,” carefully. In addition to explaining how to disassemble and clean the incubator, it contains specific cautions about cleaning methods that can damage incubator components. Chapter 7, “Service procedures,” helps you solve problems that may occur with the incubator. For example, what do you do if the temperature switches (M and ?) don’t work? (Press the Enable switch to activate them.) Chapter 8, “Maintenance Parts and Accessories,” tells you how to order replacement parts and accessories. The Appendix contains additional reference material: incubator specifications and a glossary of the terms used in this manual. What warnings and cautions mean No matter what part of this manual you are using, you should always be familiar with the cautions and warnings that appear throughout this manual. Warnings alert you to conditions and actions that can cause injury. Cautions point out conditions or actions that may damage the incubator. Please also take a moment to review the User Responsibility Statement on the inside of the front cover; it describes what is expected of you to maintain the Care Plus Incubator. Also read the Warranty on the back cover; it outlines Ohmeda’s responsibility in case of a functional defect. Symbols used in this manual An attention symbol in the left hand column alerts you to a warning or a caution in the text. The attention symbol looks like this:

Just as on the controller panel, we use arrow heads to represent the temperature switches: M Increase the control temperature ? Decrease the control temperature

1-3 1-3

1/Introduction Notes

1-4 1-4

2/Getting Started The Care Plus mounts on several different devices, the cabinet, elevating or non-elevating Base. Follow the installation instructions supplied with your system. WARNINGS

Safely mounting or dismounting the Care Plus Incubator or the Elevating Base rail system requires two people. Remove the controller unit before mounting or dismounting the incubator. Do not place the incubator in direct light. Exposing the infant or the incubator to direct radiation from the sun or incandescent lighting may cause the infant to overheat. Items not covered in this chapter If your system uses any accessories or external monitoring devices (phototherapy light, blender, etc.), follow the mounting instructions in the operation and maintenance manual for the device.

In this section Unpacking... 2-1 Mounting the Care Plus on the Elevating Base... 2-2 Mounting the Care Plus on the cabinet ... 2-3 Mounting the rail system on the cabinet... 2-4 Mounting the basic rails... 2-4 Mounting the overhead shelf... 2-5

Unpacking Inspect the Care Plus for any signs of shipping damage immediately after unpacking. If the Care Plus or its accessories appear to have been damaged in shipment, file a damage claim with the shipping carrier within 15 days of receipt. Keep all packaging materials until the claim is resolved. Also check the packing slip against the shipment to verify that all accessory devices are present. If you are not mounting the incubator on a Care Plus cabinet, elevating or non-elevating base, to install the controller perform only steps 4 and 5 of either Mounting the Care Plus on the Elevating Base or Mounting the Care Plus on the cabinet.

2-1 2-1

2/Getting Started Mounting the Care Plus on the Elevating or Non-elevating Base WARNING

Safely mounting or dismounting the Care Plus Incubator or the Elevating Base rail system requires two people. 1.

Verify that O-rings or foam gaskets are installed in the depression around each of the incubator mounting holes in the incubator platform.

2.

Lift the Care Plus Incubator onto the Base. Make sure that the front of the Elevating Base (foot pedals) faces the same direction as the front of the incubator. Refer to Figure 2-1.

3.

Install the four mounting screws.

WARNING

If mounting hardware is not securely fastened, the incubator could tip off the stand.

CAUTION

When handling the controller, avoid bumping the fan or the heater. If these items are knocked out of alignment, the fan can grate against the heater or the base. 4.

Install the controller. Lift the levers on the controller and slide it into the incubator as shown in Figure 2-1. Push the levers down to lock the controller in place.

5.

Refer to section 4 in this manual to perform preoperative checkout procedures.

Controller Lever (Lift to Remove Controller)

Incubator Platform

Foot Pedal Controls

CI.07.049

Mounting Screw

Figure 2-1 Mounting the Care Plus Incubator 2-2 2-2

2/Getting Started Mounting the Care Plus on the cabinet WARNING:

Safely mounting or dismounting the Care Plus Incubator or the Elevating Base rail system requires two people. 1.

Verify that O-rings or foam gaskets are installed in the depression around each of the incubator mounting holes in the cabinet top.

2.

Lift the Care Plus Incubator onto the cabinet. Make sure that the cabinet doors face the same direction as the incubator’s front door. Refer to Figure 2-2.

3.

Install the four mounting knobs.

WARNING

If mounting hardware is not securely fastened, the incubator could tip off the stand.

CAUTION

When handling the controller, avoid bumping the fan or the heater. If these items are knocked out of alignment, the fan can grate against the heater or the base. 4.

Install the controller. Lift the levers on the controller and slide it into the incubator as shown in Figure 2-2. Push the levers down to lock the controller in place.

5.

Refer to section 4 in this manual to perform preoperative checkout procedures.

Controller Lever

CI.02.189

Controller

Mounting Knob

Figure 2-2 Mounting the Care Plus Incubator 2-3 2-3

2/Getting Started Mounting the rail system on the cabinet Note: This section applies to cabinets with threaded mounting holes. If your cabinet does not have four threaded mounting holes on each corner, refer to the rail mounting instructions in the Service Manual. CAUTION

The maximum load on cabinet rail systems must not exceed 23 kg (50 lbs). This includes the weight of items placed on rail mount or overhead shelves.

Mounting the basic rails The short rails, long rails, single rails, and the overhead shelf use the same basic assembly procedure.

Dovetail Rail

Threaded Mounting Hole

Lockwasher Screw

CI.02.188

Tape

Tape Stiffener Plate

Figure 2-3 Mounting the basic rail system

Note: The rail kits include extra hardware to adapt them for the earlier cabinets. You will have eight, rectangular plates, 16 internal tooth lockwashers, and 16, #10 x 5/8 inch truss head screws left over. 1.

Make sure that you have the correct rail. The rails are not symmetrical. Markings on each rail tell you which side of the cabinet to put it on (Right Front/Left Rear or Left Front/Right Rear).

2-4 2-4

2/Getting Started 2.

Remove the four screws and lockwashers from the corner of the cabinet where you intend to mount the rail.

3.

Align a stiffener plate with the threaded mounting holes on the cabinet. Use the tape on the stiffener to hold it in place. Refer to Figure 2-3.

4.

Place the rail over the stiffener plate and align the holes in the rail with those in the stiffener plate. Use the tape on the stiffener to hold the rail in place.

CAUTION

The tape on the stiffener plate will not support any weight. The only reason for the tape is to help you line the parts up. 5.

Put split ring lockwashers on four, #10 x 3/4 inch socket head screws, and install the screws from the outside of the cabinet. Note: Verify that all four screws are tight before mounting any accessories on the rail.

6.

Repeat steps 1 through 5 for the second rail, if applicable.

Mounting the overhead shelf 1.

Mount the basic rails.

2.

Align the holes in the shelf with the holes at the top of the rails (four on each rail). Secure the shelf with eight, 1/4 inch screws and lockwashers.

Overhead Shelf Screw Lockwasher

CI.02.040

Endcap

Figure 2-4 Mounting the overhead shelf 2-5 2-5

3/General Information In this section Operating modes... 3-1 The air control (manual) mode... 3-1 The patient control (servo) mode... 3-2 Controls and displays... 3-4 Alarms... 3-6 Cable connections and mechanical controls...3-10

Operating modes The Care Plus has two operating modes: the air control (or manual) mode, which adjusts heater output to achieve a target air temperature; and the patient control (or servo) mode, which adjusts the incubator temperature to achieve a target infant skin temperature. In both modes, the target temperature appears in the Control Temperature display on the front of the controller and can be adjusted using the temperature switches (? and M). To distinguish between control temperatures in the different modes, this manual uses the term “air control temperature” for the control temperature in the air control mode and the term “patient control temperature” for the control temperature in the patient control mode. Note: This section briefly mentions displays, controls, and alarms that play a significant role in the air control and patient control modes. For further information, refer to the appropriate section “Controls and displays” or “Alarms.”

The air control (manual) mode The air control mode compares the air temperature to the air control temperature to determine if the heater should be switched on or off. If the air temperature is too high, the heater switches off. If the air temperature is too low, the heater switches on. Air control temperature The air control mode lets you enter air control range temperatures from 20 to 37°C (68.0 to 98.6°F) using the temperature switches (? and M). Pressing the Override switch when the air control temperature is 37°C (98.6°F) lets you increase the air control temperature to 39.0°C (102.2°F). Control temperature alarm The control temperature alarm triggers if the air temperature exceeds a normal range air control temperature by more than 1.5°C (2.7°F) or if the air temperature falls more than 3.0°C (5.4°F) below the air control temperature. For air control temperatures above 37°C, the control temperature alarm triggers if the air temperature exceeds the air control temperature by more than 1.0°C (1.8°F). To avoid unnecessary alarms, the control temperature alarm does not trigger during the first 30 minutes after power is switched on and for 15 minutes after you change the air control temperature or enter the air control mode from the patient control mode. During this period, normal incubator alarm routines verify proper operation and switch off the heater if the air temperature exceeds certain default safety limits: 38°C (100.4°F) for control temperatures below 37°C (98.6°F) and 40°C (104.0°F) for control temperatures above 37°C.

3-1 3-1

3/General Information Patient probe In the air control mode, the patient probe has no affect on incubator operation; connecting the probe simply displays the patient temperature for your information.

The patient control (servo) mode In the patient control mode, the control temperature (patient control temperature) corresponds to the desired patient skin temperature. To reach an incubator temperature that will maintain the desired skin temperature the incubator control system loops through the program shown in Figure 3-1. This program compares the patient control temperature setting to the actual patient temperature and raises or lowers the incubator temperature depending on whether the infant is hot or cold. The incubator temperature that maintains the desired skin temperature is referred to as the DET (Desired Environmental Temperature). The maximum DET that the incubator will maintain is 39.0°C (102.2°F). You can reduce the time required to reach the DET by preheating the incubator in the air control mode before entering the patient control mode. The closer the air temperature gets to the actual air temperature required to maintain the desired infant skin temperature, the sooner the incubator will stabilize the infant’s temperature in the patient control mode. When you switch to the patient control mode, the previous air control temperature becomes the initial DET. The incubator automatically adjusts the DET using the three stage patient control mode program, shown in Figure 3-1. The first stage of the loop checks to make sure that the patient probe is reporting a reasonable patient temperature before making any adjustments. If the patient temperature is less than 30°C (86.0°F) or above 42°C (107.6°F), the incubator assumes that the patient probe has detached from the infant, the patient temperature alarm triggers, the heater shuts off, and the DET remains unchanged. The second stage of the loop calculates the PTG (Patient Temperature Gradient), the difference between the actual patient temperature and the selected patient control temperature, to determine if the infant is hot or cold. If the infant is too cold (PTG < -0.5°C), the heater switches On. If the infant is too hot (PTG > 0.5°C), the heater shuts down. The patient temperature continues to be checked every three seconds. The third stage calculates the change in the patient temperature over the previous ten minute period. If the infant temperature differs from the patient control temperature setting by 0.2°C or more, and this difference has not decreased by at least 0.2°C during the last ten minute period, the DET will be adjusted. To prevent large incubator temperature swings and to allow time for the patient to respond to changes in the incubator temperature, the magnitude of the change in the DET depends on the PTG. Patient control temperature range The patient control mode lets you enter air control temperatures from 35.0 to 37.0°C (95.0 to 98.6°F) using the temperature switches (? and M). An internal adjustment lets you increase the patient control temperature to 37.5°C (99.5°F). Patient temperature alarm Patient temperature alarm monitoring runs concurrently with the control loop. A patient temperature alarm triggers if the patient temperature differs from the patient control temperature by more than 1.0°C (1.8°F), or 0.5°C (0.9°F) with an internal adjustment. Additional alarm routines verify proper operation and switch off the heater if the air temperature exceeds 40.0°C (104.0°F).

3-2 3-2

3/General Information

Repeat first stage Start

No

Is the PT <30°C?

Stage 1

PT = Patient Temperature PCT = Patient Control Temperat PTG = PT-PCT DPT = Current PT - PT 10 min. previous

Yes 1) Switch heater off 2) Activate alarm Assume probe 3) Keep DET constant is dislodged

Yes Have 10 min passed? Start third stage

No No Is the PT >42°C?

Yes

Yes Infant is cold

Supply maximum heat

No

Is the PTG > 0.5°C?

Infant is hot

Assume probe is dislodged Is the DPT³ 0.2°C?

Is the PTG <-0.5°C?

Yes

Is the PTG³0°C?

Infant is cold

No

Stage 2

Stage 3

Yes Infant is hot

Yes

DET change = 0

Yes

Is the DPT£ -0.2°C?

No PTG -0.5°C -0.4°C -0.3°C -0.2°C -0.1°C -0.0°C

No DET Change 0.3°C 0.3°C 0.2°C 0.1°C 0.0°C 0.0°C

PTG 0.5°C 0.4°C 0.3°C 0.2°C 0.1°C 0.0°C

DE Chang -0.3°C -0.3°C -0.2°C -0.1°C -0.0°C -0.0°C

Supply no heat

Calculate new DET No

CI.02.068

New DET = Old DET + Change

Figure 3-1 Patient control mode logic diagram 3-3 3-3

3/General Information Controls and displays Patient Temperature

Air Temperature

Mode

Control Temperatur

Air

Control

Patient Control

Air Circulation

Patient Temp Probe Failure Control Temp System Failure High Air Temp Power Failure

Heater 100% 75% 50% 25%

Controls

Air

Control

Air Override > 37° C

Patient Control

°F / °C

Enable

CI.02.181

Alarms

Figure 3-2 Controls and displays

Patient temperature During normal operation, the patient temperature display shows the temperature sensed at the patient probe tip, in Celsius or Fahrenheit. The patient probe must be properly connected to the incubator and the infant for an accurate patient temperature measurement. Temperatures between 22.0 and 42.0°C (71.6 and 107.6°F) are displayed to the nearest 0.1°C or °F. Temperatures above this range result in a HHHH temperature display. Temperatures below this range cause LLLL to be displayed. Depressing the Enable switch for more than five seconds tests the temperature monitoring system. If the monitoring system is functioning correctly, 25.05°C ±0.2°C replaces the patient temperature during the test. Air temperature During normal operation, the air temperature display shows the internal incubator temperature. Air temperatures between 5 and 50.0°C (41 and 122°F) are displayed to the nearest 0.1°C or °F. Depressing the Enable switch for more than five seconds tests the temperature monitoring system. If the monitoring system is functioning correctly, 37.95°C ±0.2°C replaces the air temperature during the test.

3-4 3-4

3/General Information Control temperature During normal operation, the control temperature display shows the control temperature (air or patient) selected by the operator. When you first power up the unit or if you enter the patient control mode, the control temperature flashes and a prompt tone sounds until you enter a control temperature. In the air control mode, the control temperature range is 20 to 39.0°C (68 to 102.2°F). Air control temperatures above 37.0°C (98.6°F) require the use of the Override switch. In the patient control mode, the control temperature range is 35 to 37°C (95.0 to 98.6°F). Note: Qualified service personnel can configure maximum patient temperature to 37.5°C. During a system failure alarm, the appropriate error code appears in the control temperature display. Depressing the Enable switch for more than five seconds replaces the control temperature with the percentage of the rated line voltage supplied by the power outlet. Heater 100% 75% 50% 25%

Four LED displays illuminate to show the average heater power over the last minute as a percentage of the maximum output (100%, 75%, 50% and 25%). In the example, the average heater power is 75% of the maximum power. The alarm silence switch has two functions. Pressing the switch silences all audible alarms except for the system failure and power failure alarms. The length of the alarm silence period depends on the alarm condition as detailed in the “Alarms” section. The alarm silence indicators (next to the switch) illuminates for the duration of the alarm silence period. Depressing alarm silence switch for five seconds or longer illuminates all control panel LEDs and causes “188.88” to appear in the temperature displays. The alternating, two tone alarm also activates.

°F / °C

Enable

Air

Control

The °F/°C switch changes the temperature displays from degrees Celsius to degrees Fahrenheit and vice versa. Pressing the Enable switch activates the temperature switches (? and M), the mode switches, and the Override switch for approximately 12 seconds. The enable indicator illuminates when these switches are active. If the indicator goes out, you must press the Enable switch again to reactivate these switches. Pressing the Air Control switch selects the air control mode of

Air operation and illuminates the Air Control indicator (next to Control Override > 37° C Temperature display). To prevent accidental mode changes, you must

press the Enable switch to activate the Air Control switch. The audible alarm sounds briefly when the mode of operation is changed. Note: The incubator defaults to the air control mode when power is first applied.

3-5 3-5