- ページ 13
計測機器 Armstrong Monitoring AMC-1040のPDF 据付・取扱説明書をオンラインで閲覧またはダウンロードできます。Armstrong Monitoring AMC-1040 17 ページ。 Gas monitor with integral electrochemical sensor
ページを印刷する4) For accurate calibration, ensure that the sensor is in clean air and allow a few
minutes before adjusting the zero setting. Place the calibration adapter onto the
sensor. Open the valve by turning it fully counter-clockwise to start the flow of gas
and proceed with calibration. When this procedure is successfully completed, shut off
the valve by turning it fully clockwise to stop the flow of gas. Adjust the Zero trimmer
for a stabilized reading of 0.00 VDC measured at the test points (see Figure 6).
5) Apply a Span gas sample. The Span gas sample need not be of the full-scale
concentration but may be a fraction of this. Since the monitor output range is 0 to 1
VDC, a full-scale concentration gas should read 1.00 VDC after a few moments of
sensor exposure. Similarly, a half scale concentration gas should read 0.50 VDC.
If required, calibration kits are available from AMC. Each kit consists of the following items (as
shown in Figure 6):
1. Carrying case for the control value regulator, hose, adapter, two gas cylinders (not
included) and the instruction manual.
2. Control valve regulator with 0.5 LPM rate.
3. Calibration adapter with hose.
To order calibration gas cylinders, specify the gas concentration required. Each cylinder
contains the proper mixture to calibrate for the gas being detected. Each cylinder contains
approximately 15 liters of gas at 240 PSI, which lasts approximately 30 minutes.
5.2.3 ALARM ADJUSTMENTS
Alarms are set at the factory and do not need to be adjusted unless a change in alarms is
required.
Low alarm adjust is used to establish the low alarm trip point. This is done by adjusting the
voltage to the appropriate fraction of full scale at test points COM and LOW TP (see Figure 7).
Example:
Full scale = 100 ppm
Low alarm trip = 35 ppm
35/100 x 1 VDC
= 0.35 VD
High alarm adjustment is done in the same manner as above, using the high alarm adjust and
measuring between COM and HI TP.
AMC-1040 Monitor
8