Description
Standard version of CAM A/B includes
- Alpha Channel with 2” dia ZnS(Ag) scintillation detector mounted on 2” dia PMT, Air Sampling System with electronic flow meter, Easy-to- Replace Filter Paper Holder Arrangement, 100 LPM independent air sampling pumps.
- Beta Channel with 20 mm dia End Window GM tube, Air Sampling System with electronic flow meter, Easy-to- Replace Filter Paper Holder Arrangement, 100 LPM separate air sampling pump.
- Common Electronic Microcontroller unit with independent HV supplies, Pulse Processing Circuits, Counters, Flow Measurement and Display of Air Flow, CPM and Bq/M3 for each channel. 6 digit LED display for CPM and 4 x 20 Char LCD for menu, Bq/M3, Flow and other menus
- Low and High Level Count Rate Alarms, 4-20mA output, Potential Free Relay Contact outputs, Green, Red Tower Lamps with Flasher and Audio Alarms for each channel.
- Calibrate Mode to calibrate the activity in Bq using reference sources, Flow in LPM using standard Flow Meter.
Electronic Readout Unit uses 2 LED displays for CPM indication. 4 x 20 Character LCD is used for various menus, Bq/M3 and flow reading. 6 Keys pad enables user to set up the parameters and also calibrate the instrument for Flow and Activity measurement. Keylock is provided to prevent unauthorized tampering of the set up.
2” dia ZnS(Ag) Scintillator based Alpha Detector is mounted on 2” dia PMT. Voltage Divider and Preamplifier are also housed in the detector assembly. This detector gives better than 25% efficiency. Beta detection is done by 25mm dia GM tube type 72314 from LND USA. GM tube is covered by 25 mm thick lead shield to reduce the gamma background. Beta efficiency is around 10 ~12.
Electronic Flow sensors are employed for measurement of air flow in LPM. The flow totalizer gives the integrated value of air volume that has passed through the filter paper in the given time. This gives accurate estimates of Bq/M3.
These flow sensors are calibrated against standard turbine type flow meter for the range 20 to 100 LPM.
Two independent air sampling pumps with 117 LPM (free air) capacity are used for Alpha and Beta Channels. Use of separate pumps removes any interaction of air flow between Alpha and Beta channels.
Since Air Flow measurement is carried out by electronic flow meter, conventional Rotameters are not required in the air line. Air flow is adjusted by the vent valves provided at the inlet side of the pump(s).
Elegant yet simple, design of CAM enables user to change the filter paper(s) without disturbing the detector mounting arrangement. Air Sampling Pumps are rated for continuous operation. Rotameter flow measurement is also possible as an alternative to electronic flow measurement. CAM is also available in only Alpha, only Beta or both Alpha and Beta versions.
| CAM A / B | ||
| Parameter | CAM A | CAM B |
|---|---|---|
| No. of Channels | Alpha (1) | Beta (1) |
| Detector(s) | 2” dia ZnS(Ag) Scintillator on 2” dia PMT | 20 mm dia End Mica Window GM tube with 25 mm thick lead shield |
| Filter Paper Arrangement | 2” dia filter paper mounting, with easy-to-replace filter holder in sampling system for Alpha Channel | 2” dia filter paper mounting, with easy-to-replace filter holder in sampling system for Beta Channel |
| Flow Measurement | Electronic or by Rotameter (0 to 100 LPM Range) | Electronic or by Rotameter (0 to 100 LPM Range) |
| Air Sampling | Continuous rated air sampling pump (100 LPM) for Alpha channel | Continuous rated air sampling pump (100 LPM) for Beta channel |
| HV Supply | 0 to 1000V preset for alpha channel | 0 to 1000V preset for beta channel |
| Display | 6 digit LED for CPM 4 × 20 Char large LCD for Bq/M³, Flow, Alarm Levels |
6 digit LED for CPM 4 × 20 Char large LCD for Bq/M³, Flow, Alarm Levels |
| Ranges | 50, 500, 5000 or 50000 CPM settable | 50, 500, 5000 or 50000 CPM settable |
| Calibration | Air Flow and Counting Efficiency | Air Flow and Counting Efficiency |
| Alarms | Green / Red Tower Lamps with audio alarm | Green / Red Tower Lamps with audio alarm |
| Alarm Setting | Warning and High CPM Alarm Low and High for Air Flow |
Warning and High CPM Alarm Low and High for Air Flow |
| Outputs | Potential free Relay contacts, 4–20mA Output, RS-485 (Modbus)/RS-232 | Potential free Relay contacts, 4–20mA Output, RS-485 (Modbus)/RS-232 |
| Air Flow Pump | Independent pump 126 LPM open flow with silencer | Independent pump 126 LPM open flow with silencer |
| Flow Control | By Vent Valve with inlet air filter | By Vent Valve with inlet air filter |
| Mechanical Enclosure | Powder coated MS Trolley on caster wheels | Powder coated MS Trolley on caster wheels |
| Power | 230V / 50 Hz AC Mains | 230V / 50 Hz AC Mains |
Due to continuous R&D, specifications are likely to change without notice
