High Sensitivity Tritium in Air Monitor
Model 611C-27N2.7M
Applications
611C-27N2.7M – Sensetecz Engineering Tritium in Air Monitoring System (hereinafter referred as 611C) is a cabinet monitoring instrument. A Remote Industrial Panel PC is connected to 611C via an Ethernet Modbus. All the operation, including instrument operation, display, parameters setting, etc. can be accomplished either by 611C control system, or the remote panel PC.
611C is designed to monitor either total tritium, including HTO/HT together, or HTO-tritium water in air and elemental tritium in air separately. 611C uses quadruple cylindrical ion chamber design to achieve higher grade of gamma and noble gas compensation. An advanced electrometer circuit is used to measure the tritium in air from 27nci/m³ to 2.7mCi/m³ reliably in nuclear power plants and labs, also a gamma survey meter (a separated GM tube and counting circuit) is built into the unit. 611C monitors tritium and gamma at the same time.
Advantages
- Quadruple cylindrical ion chamber design:
4 machined stainless cylinders, 2 for measuring, 2 for compensation, to obtain the best volume uniformity and symmetrical orientation, therefore a higher grade of gamma and noble gas compensation is realized.
- No range switching required, full range noble gas compensation, full range HTO & T2O measurement
Ultra precision/stable electrometer circuit with 24-bit ADC convertor can achieve high & reliable sensitivity of 27nci/m³ and measuring range from 27nci/m³ to 2.7mci/m³ without range switching. This fixes the saturation problem in high range noble gas compensation – With an external drier 651, noble gas compensation for full measuring range can be achieved. Further make 611 achieve HTO/T2O and elemental 3H2 in air discrimination within the whole measurement range.
Software integrates all devices together
- Drier Monitoring by a humidity sensor
A drier fault will be generated when the humidity of compensation chamber is higher than the setting, this ensures the safer noble gas compensation.
- Measuring/Compensation chamber’s pressure is monitored.
Since there is pressure drop on the air flow path, the computer will compensate the pressure difference between Measuring and Compensation chamber to improve the noble gas compensation.
- Data logging
All the readings are Time-stamped and logged into 512kbytes EEPROM.
Industrial Panel PC with Tri-net software
- An industrial panel PC with Tri-net software operates, controls 611C, shows all the data, diagrams, trends and provides alarms simultaneously with 611C itself.
Performance enhancement
- High precision and stable current measurement circuit has been used to measure as low as 0.05fA current. Lab gas calibration and temperature stability test shows better than 1% accuracy of tritium measurement from temperature 0ºC to 40ºC.
- Measuring/Compensation chamber’s pressure are monitored. Since there is pressure drop on the air flow path, the computer will compensate the pressure difference between Measuring and Compensation chamber to improve the noble gas compensation.
- Built-in ion trap into each ion chamber with high electrical field to reduce charged particle interference.
- Fast response, < 90S from 0 to 10µCi/m3 and < 30S for 10µCi/m3
- Radon compensation by electronic circuit and software filter.
- Environmental gamma reading by optional GM tube.
- Ion Chamber Decontamination by cartridge heater.
- LEDs and LCD background to indicate the alarm and warning states.
- Ultra-low power consumption free-scale MKL25 microcontroller is used for the control/display.
- Data logging – all the readings are Time-stamped and logged into 512kbytes EEPROM.
- Remote control and display with an industrial panel