LB 147 User and Service Manual V 1.28 May 2014

LB 147

Contents

1

INTRODUCTION ... 1

2

DEVICE DESCRIPTION ... 4

3

GETTING STARTED... 8 3.1 Components ... 8 3.2 Pin Assignment ... 8 3.3 Connecting the Power Supply ... 11 3.4 Connecting the Probes ... 11 3.5 Digital Inputs... 11 3.6 Connecting the External Signal Lights... 11 3.7 Serial Ports ... 14 3.7.1 RS232/RS484 Port ... 16 3.7.2 USB Port ... 17 3.7.3 Ethernet Port... 20 3.7.4 Card Reader/Transponder Port ... 32

4

PROGRAM DESCRIPTION ... 33 4.1 Structure of the Software ... 33 4.2 Operation ... 33 4.2.1 Display with Touch Panel... 33 4.2.2 Key Overview... 33 4.2.3 Input Menu ... 35 4.3 Login with Password Entry ... 36 4.4 Menu Navigation ... 37 4.4.1 Structure ... 37 4.4.2 Keys ... 41 4.4.3 System ... 41 4.4.4 Parameters ... 46 4.4.5 Measure ... 48 4.4.6 Memory ... 48 4.4.7 Nuclides ... 49 4.4.8 Service ... 50 4.5 Measurements... 56 4.5.1 Background Measurement ... 56 4.5.2 Calibration... 58 4.5.3 System Test ... 59 4.5.4 Contamination Measurement with Clothing Probe without Data Storage 59 4.5.5 Person Contamination Measurement with Data Storage (if enabled) ... 60 4.5.6 Background Check ... 64 4.5.7 Status of the Measured Values ... 65 4.6 Data Communication ... 66 4.6.1 Protocol Structure ... 66 4.6.2 Error Messages ... 69 4.7 Software Update... 69

5

APPENDIX ... 77 5.1 Calibration Factors and Efficiencies according ISO 7503-1 ... 77 5.2 Calibration Factors and Efficiencies according A-100 ... 81 5.3 Printer Settings ... 86 5.4 Calculation Formulas... 87 5.5 Technical Data ... 91

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Contents

LB 147

5.5.1 Detectors ... 91 5.5.2 Microprocessor Module BE0100 ... 91 5.5.3 Display / Touch Panel ... 92 5.5.4 Probe Connections ... 92 5.5.5 Digital Inputs ... 93 5.5.6 Relay Outputs for External Signal Lights and Gate Control ... 94 5.5.7 Magnetic Card Reader and Transponder System... 97 5.5.8 Analog Outputs for High Voltage Control ... 98 5.5.9 Power Supply of the Measuring Electronics ... 98 5.5.10 Housing Dimensions ... 98 5.5.11 Ambient Temperature ... 98 5.5.12 Relative Humidity ... 98

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LB 147

Introduction

1 Introduction The LB 147 Hand-Foot-Clothing Monitor is a contamination monitor that can be employed for all kinds of applications in the entire field of radiation protection to measure contamination caused by Alpha and Beta/Gamma radiation. The contamination on clothes is measured using the removable right hand probe. If configured, at the end of a contamination measurement you will automatically be prompted to carry out a back of the hand measurement. Other options can be integrated, for example a dose rate probe for measurements in the stomach area and a NaI probe for iodine activity measurement in the thyroid. Persons are identified prior to the measurement with the aid of a magnetic card reader or transponder (optional). Low maintenance thin-layer ZnS (Ag) scintillators are used as detectors. The menus are very clearly structured and easy to operate. You can easily change between different nuclides. The LB 147 is operated by means of a touch panel on the graphical display. Parameter input is protected by double password hierarchy. Two optional external signal lights indicate the operating state and/or exceeding of an alarm threshold. If requested, a gate can be released if no contamination is detected. Up to 1750 measured data can be stored and transferred to an external computer via a serial port. Alternatively, the USB or Ethernet port may be used. A comprehensive communication protocol permits the integration into a measuring network. Up to 32 devices can be connected in a network at the same time to one RS485 data bus having a length of up to 1200 m using the integrated RS485 hardware. The built-in power supply automatically adjusts to the various alternating voltage supplies.

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Introduction

LB 147

Brief overview of the special features of the device:             

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Compact device for laboratory use Suitable for Alpha and Beta/Gamma contamination measurements Low maintenance ZnS (Ag) scintillators Removable hand probe for clothing measurement Connection of two additional probes for stomach and thyroid measurements, or connection of a fifth contamination probe in the abdominal area Wide range input of power supply; 85 to 264 VAC Data transfer and communication in local measuring networks Very easy to read graphical LCD display with touch panel External light signals and exit gate control Locking of the measuring parameters via double password hierarchy Personal identification and presence control via magnetic card reader and transponder Integrated service functions for testing and quality control USB, Ethernet, RS232 and RS485 interface

LB 147

Introduction

Presently, the following probes can be attached for contamination measurements: 

Hand probe (clothing probe) with ZnS (Ag) scintillator Measurement area: 150 x 230 mm, effectively: 345 cm² (80% transmission) Measuring range: Alpha: 0 - 5 000 cps, Beta: 0 – 50 000 cps Radiation: Alpha, Beta, Gamma Background: approx. 0.1 cps (α) approx. 15 cps (βγ), depending on the operating point



Foot probe with ZnS (Ag) scintillator Measurement area: 150 x 370 mm, effectively: 555 cm² (72% transmission) Measuring range: Alpha: 0 - 5 000 cps, Beta: 0 – 50 000 cps Radiation: Alpha, Beta, Gamma Background: approx. 0.2 cps (α) approx. 40 cps (βγ), depending on the operating point



Low dose rate probe LB 1236 with a proportional counter tube as a stomach probe Measuring range: 50 nSv/h – 10 mSv/h Energy range: 30 keV – 1.3 MeV Calibration factor: 0.214 µSv/h/cps Sensitivity: 4.67 cps/µSv/h Intrinsic background: 0.5 cps



1” x 1” NaI probe LB 1234 as a thyroid probe Energy range: 25 keV – 2 MeV Background: approx. 30 cps at 100 nSv/h γ-ambient dose rate

Other probes can be connected, provided they have an internal high voltage supply and a pre-amplifier which supplies positive standard pulses, power supply = 5 V DC.

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Device Description

LB 147

2 Device Description The measuring device consists of a compact and rugged steel housing with a stainless steel foot plate. The entire electronic system consists of a printed circuit board with plugged-on microprocessor unit, plugged-on touch display and a very small power supply module. The electronics is accommodated below the head part of the monitor. The two hand detectors are also housed in the head part; the right hand probe can be removed and used as clothing probe. An infrared sensor is located next to the detectors to detect the hand positions. An optional magnetic card reader is mounted above the display, an optional transponder on the front of the head part. While the stomach probe in front of the device is mounted so that it can be adjusted manually, the thyroid probe is mounted on a movable stand above the head part.

The plug-in connections are passed outside towards the back of the head part, also the power supply, fuse, on-off switch and connector for external signals and gate. The foot detectors are installed below the stainless steel step plate. They may be covered by a very thin protective foil to avoid that the detector foil gets dirty. The step plate is held by two springs in the rear area about 3 mm above the floor tray. When you step onto the step plate, a micro switch is triggered by the downward movement and the measurement starts. The optional external signal tower is typically fitted with a green (ready to measure) and red lamp (contaminated). The following figure shows an overall view of the device. On the next page you see a block diagram showing the functions of the device.

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LB 147

Device Description

Figure 1: Hand-Foot-Clothing Monitor

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Device Description

LB 147

Figure 2: Block diagram of the device functions

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LB 147

Device Description

All parameters of the device are permanently stored in a Flash memory, only the real-timer clock requires an external lithium cell for power supply; normally, lithium cells have a lifespan of more than 5 years. A device software update can be carried out via serial port 1 or the USB port. All external inputs and outputs are pluggable. The relay changers for the two external signals are lead through via a 7-pin socket, those for the gate via a 4-pin socket. The device can be supplied with different external supply voltages. The AC voltage covers a range from 85 to 264 VAC, at 47 or 65 Hz. The power consumption is about 7 W. The power supply of the probes is +5 VDC, the current consumption is about 40 mA for the hand detectors and about 80 mA for the foot detectors.

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Getting Started

LB 147

3 Getting Started 3.1

Components The following components must be available for start-up:         

Monitor LB 147 including measuring electronics with 2 hand and 2 foot probes optionally, a stomach and/or thyroid probe optionally a magnetic card reader or transponder (external supply) optionally a signal tower with 2 signal generators and cables optionally a connection cable to the external door control optionally an RS-232/USB or Ethernet connection cable to the PC 110/230 VAC cable connection User manual

The Monitor LB 147 should be set up inside an enclosed building. The serial cable (null modem cable) for the RS232 interface should be shielded and not exceed 20 m. With RS485, a shielded twisted data cable with a maximum length of 1200 m should be used.

3.2

Pin Assignment

Figure 3: Pin assignment

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LB 147

Getting Started

Pin assignment Hand detectors: 9-pin Sub-D connector Pin Meaning 1 Alpha pulse, standard signal 2 Beta pulse, standard signal 3 HV-Ctrl voltage 4 not used 5 not used 6 Ground 7 +5VDC Foot detectors: 25-pin Sub-D connector Pin Meaning 1 Alpha pulse, standard signal 2 Ground 3 HV-Ctrl voltage-1 14 Beta pulse, standard signal 15 +5VDC 16 HV-Ctrl voltage-2 18 Ground Microswitch (internal ST10A) Pin Meaning 1 Ground 2 Clothing probe 3 Ground 4 Foot grid IR sensors for hand positions (internal ST10B) Pin Meaning 1 +12V supply sensor 2 Ground 3 Hand right switching signal 6 +12V supply sensor 7 Ground 8 Hand left switching signal Optional (thyroid and stomach dose rate probe) Pin Meaning 1 Stomach counting signal 2 Thyroid counting signal 3 HV-Ctrl for stomach probe 4 HV-Ctrl for thyroid probe 6 Ground 7 +5V supply 8 Ground

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Getting Started

LB 147

1st serial RS232/RS485 interface for data communication Pin Meaning RS type 1 not used 2 RxD RS232 3 TxD 7 RTS 8 CTS 5 Ground 6 electrically isolated mass 4 A RS485 9 B 2nd serial RS232 interface for magnetic card/transponder Pin Meaning RS type 1 not used 2 RxD RS232 3 TxD 7 RTS 8 CTS 5 Ground Cable connector "Alarm, Signals" for external signal lights 7-pin Pin Meaning Relay 1 Contact open when turned off Relay 1: Ready for 2 Changer relay 1 operation 3 Contact closed when turned off 4 Contact open when turned off Relay 2: 5 Changer relay 2 Contaminated 6 Contact closed when turned off Cable connector "Gate" for external gate 4-pins Pin Meaning Relay 1 Contact open when turned off Relay 3: 2 Changer relay 3 Gate 3 Contact closed when turned off

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LB 147

Getting Started

3.3

Connecting the Power Supply The LB 147 can be supplied with different external supply voltages. The wide input range goes from 85 to 264 VAC and the frequency range lies between 47 and 65 Hz. Manual switchover is not necessary. The connection is made via an IEC connector.

3.4

Connecting the Probes Presently, up to 6 probes can be connected to the device. The power supply for the probe is +5 VDC, the control voltage for controlling the high voltage of the probe is in the range 0 to 4.095 VDC with a resolution of 12 bits. The current consumption of the probes is approx. 40 or 80 mA. The control voltage is set in the main menu (see section 4.4.4: Menu Control Voltages). The probes deliver a standard pulse as counting signal (width: >0.8 µs, amplitude: 4 to 6 V). The probes may be connected only while the device is turned off. The shielding of the probe cables must be connected to the connector housing of the cables.

3.5

Digital Inputs The measurement is controlled via the digital inputs. Two of the four digital inputs are connected to the infrared sensors which detect the correct positioning of the hands. The third digital input detects if someone has stepped onto the monitor, and the fourth finally signals that the hand probe has been taken off.

3.6

Connecting the External Signal Lights The device has three built-in relays with one changeover contact each for DC or AC voltage up to 250 V, 5 A. Thus, up to two sensors and an exit gate can be connected. The relay contacts are supplied with the voltages necessary for the signal lights from the outside. The following figure shows a typical wiring with two optical signal lights with continuous light. The green signal indicates the intact operating state of the device (no probe failure), the red signal lights up when a person is contaminated. This signal can be reset via the touch panel with or without password, depending on the configuration. Figure 4a shows the typical connection of the external signal lights. The exit gate control is similar and must be adapted to the gate hardware (see Figure 4b)

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Getting Started

LB 147

Male connector 6 pol. (alarm)

Female connector 6 pol.

Light beacon (red,green) ye

Rel 2

6 4 5

6

PE

5

6

4

5

Rel 1

3

2

bn L

4

3 1

PE

pk

2

3

1

2

gy

4 3 2

gn

1

1

bl

0

Male connector 6 pol. (alarm)

Female connector 6 pol.

Light beacon (red,green,horn)

Rel 2

6

ye

4 5

6

PE

5

6

4

5

3 Rel 1

N

3 1

2

2

1

PE bn L

4 gy

3 2 1

pk gn

4 3 2 1

bl

0

N

Figure 4a: Connecting external signal lights

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Pin 2 1 3

Meaning Contact open when turned off Changer relay 1 Contact closed when turned off

5 4 6

Contact open when turned off Changer relay 2 Contact closed when turned off

Relay Relay 1: Ready for operation (green) Relay 2: Contaminated (red or red/horn)

LB 147

Getting Started

Relay contacts are led outside (Cable connector „Gate“)

Relay door control LB 147

Figure 4b: Connecting the door control Pin 1

Meaning Contact open

1 2 3 3

Contact closed Changer relay 3 Contact open Contact closed

Relay If the door is triggered or device is turned off Relay 3: If the door is not triggered Gate If the door is not triggered If the door is triggered or device is turned off

If the door control is used the gate function has to be activated in the menu via SystemGate. Also a time has to be defined during which the gate is open. The signal lights are available for 230 VAC and 24 VDC. When connecting other external loads to the relay contacts, attention should be paid to the fact that these are non-inductive for noise immunity (e.g. no motors). During operation, all relays are activated in the normal condition, i.e. if no failure or contamination is present.

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Getting Started

3.7

LB 147

Serial Ports Depending on the choice of the serial port used, the following settings must be taken into account for the configuration: Slide switch ST17: If the RS485, the Ethernet port or USB port is used, the slide switch ST17 must be set to USB as shown in Figure 5 and 6. However, if the RS232 port is used, the switch must be set to RS232. Switch ST17

Figure 5: ST17 switch setting to switch between different ports Jumper J2: In addition to the switch position ST17, the appropriate allocation of jumper J2 (see Figure 6) also has to be observed.

USB Ethernet RS232 RS485

Switch ST17

Jumper J2

to USB to USB to RS232 to USB

no matter 2+3 2+3 1+2

Figure 6: Switch and jumper assignment of LB 147 interfaces

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LB 147

Getting Started

Jumper J2 1 2

3

Current position of jumper J2: 2+3

Figure 7: Jumper assignment jumper J2 of the LB 147

Software: In addition to changing the allocation of jumper J2 and the switch setting ST17, the interface also has to be configured in the software under Menu  System  Serial Ports  Transfer Mode.

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Getting Started

LB 147

3.7.1 RS232/RS484 Port The device has one configurable serial port (RS232 or RS485). The serial ports are located on the rear panel (see Figure 5); port 1 is labeled RS232 and port 2 is labeled Card reader. Both RS232 ports work with hardware handshaking. The RS485 port is electrically isolated from the chassis ground and works without hardware handshaking. All inputs and outputs are very well protected against electromagnetic interference. If one device, in the case of the RS485, is at the end of the line (twisted, shielded cable pair), the cable should always be terminated with 120 Ohms. Serial port 1 is used to connect a printer (print settings, see Appendix), an external computer, a modem or measurement network (via RS485, Ethernet or USB). The baud rate (2400 - 38400 baud) can be set by software. The other parameters are fixed: 8 data bits, 1 start bit, 1 stop bit, no parity, hardware handshake (no handshake at RS485). With RS232, the cable lengths are not to exceed 20 30 m. In case of RS485, up to 32 devices can be attached to a twisted pair cable up to a length of 1200 m. The highest data transmission rate also depends on the length of the cable and may have to be adjusted. The shield of the cable should be placed onto electrically isolated ground.

RS type Voltage level Cable lengths

RS232 negative: -6V to –12V positive: +6V to +12V < 30m

Cable type

shielded 5-wire cable

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RS485 Difference signal according to standard < 1200m, max. 32 devices per bus cable shielded, twisted-pair cable (data cable), Impedance: 120 Ohm

LB 147

Getting Started

3.7.2 USB Port The USB port is designed as a SLAVE, and is only used to communicate with a PC; a printer cannot be connected. USB Driver Installation If the device and the PC are connected via USB, the PC signals „New hardware found“ and prompts you to install the drivers. These are located on the CD supplied in the directory USB, both for Windows 2000, XP and Vista, and for Windows 7 (32 and 64 bit). This directory also contains the driver manufacturer's installation instructions for different operating systems (www.ftdichip.com). You have to install a VCP driver (Virtual COM Port) for the FT232BM chip. In the instructions for Windows 2000, XP and Vista, the installation of the VCP driver is described in section "Installing CDM Drivers ..." (Common Driver Model).

Preparation of data communication between LB 147 and PC (using the Windows 7 operating system as an example) If the device is connected to the PC for the first time, the required USB drivers have to be installed; they are located on the CD in the directory USB. Insert CD into the drive and start the application INSTALL OS_Detect.exe as administrator and follow the instructions. After correct installation, an additional COM port named USB Serial Port appears on the Connections tab of the Device Manager. This port can only be accessed for use in a terminal program. (Note: The additional COM port is available only as long as the device is connected to the PC).

Viewing the assigned COM port under Windows (Windows 7 operating system) Open the Device Manager via Start  Control Panel  Device Manager. Click on Ports (COM & LPT) in the list to view COM port that has been assigned to the USB port.

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