Calibration of BW Gas Point can be executed at any time during normal operation except the selft tes period (from 10 minutes before the selft test until the selft test is complete) BW technologies recomends a premium grade calibration gas, Gases with NIST (National Institute of standards and Technology)
Start Calibration:
1. Press and hold the external button down while the LCD displays the alarm setpoints, continue to hold the button until the display reads CAL (approx 5 seconds) and then release the button.
- The 4-20 mA output will be 3 mA throughout calibration. Calibration the Gas Point will not cause false alarms at the controller
- on this step: first LCD monitor will display low and high alarm (approx 8 sec), next the CAL icon lights for 3 sec, gas type is constantly displayed and backlight is activated.
Auto Zero
2. The Gas Point will then take a zero level reading, combustible and toxid sensors; if background gas is present, apply zero the sensor, restart the calibration sequence will take 30 to 60 seconds.
- On display, numeric display will read 00, auto zero advice flashes, gas monitor constantly displayed.
Auto Span
3. Insert cal cap and apply gas to sensor for approx 2 minutes (ammonia 5 minutes)
4. When the countdown (300 to 00) begins, spen is complete, disconnect the gas
- If span fails: check calibration gas cylinder used and concentration expected. Replace the cylinder and/or change the cal gas expected value, if required, recalibrate
- Oxygen sensor, use pure air calibration gas (20.9% O2) in case of deficient to enriched atmosphere.
- on display : numeric display will show calibration gas value expected, gas cylinder icon flashes, span advice lights, gas type is constantly displayed, after a succesful calibration, gas point automatically returns to normal operation and displays the current reading (ppm or %) present
terimakasih untuk infonya.
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