ECA 450
Calibration
Instruction 0024-9400
55
Procedure:
1.
Enter Calibration List screen; then choose HC per Section 3.3 to display
the CALIBRATE HC screen. A
t the conclusion of this step the pump
should be running.
2.
Using the Gas Fixture shown in Figure 3-1, attach a CH
4
calibration gas
cylinder to the analyzer’s GAS inlet port.
3.
Adjust regulator of calibration fixture for a flow meter indication of
approximately 2 SCFH.
4.
Wait until Measured reading on screen stabilizes (approximately
3 minutes). Then use the
∧∨
and < > keys to enter an Applied value that
equals the concentration stamped on the CH
4
gas cylinder.
The calibration range is from 1 to 3%. An applied value that is outside
this range will cause the message “Bad Calibration Entry” to appear.
Typical Calibrate HC Screen During Calibration:
««««CALIBRATE HC««««
Measured 1.93 %
Applied 2.50 %
5.
Press
ENTER
to calibrate the analyzer’s Measured value to that of the
Applied value; after which the message “Good Calibration” should appear
along with the Calibration List screen being redisplayed.
If the message “Sensor Output Low” or “Sensor Not Calibrated” appears,
refer Section “5.4 Troubleshooting Guide.”
6.
Turn off regulator; then remove gas cylinder from calibration fixture.
3.8 Calibrate CO-LO Sensor
This screen is used to span the Carbon Monoxide Low channel (0 – 4,000 ppm
CO) to a known gas level. This procedure also includes H
2
compensation.
Material Required:
• Calibration Gas Fixture (Section 3.2)
• Gas Cylinder: 500 ppm CO in air (refer to Section 6.2)
• Gas Cylinder: 1000 ppm CO & 1000 ppm H
2
in Nitrogen
(refer to Section 6.2)
Procedure:
1.
Enter Calibration List screen; then choose CO-LO per Section 3.3 to
display the CALIBRATE CO-LO screen. A
t the conclusion of this step the
pump should be running.
2.
Using the Gas Fixture shown in Figure 3-1, attach a CO-only calibration
gas cylinder to the analyzer’s GAS inlet port.