AMC SIR Series Руководство по эксплуатации - Страница 16
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Печатать страницуAMC-SIR Refrigerant Gas Sensor/Transmitter
DIGITAL
MULTIMETER
(DC CURRENT MODE)
mA
DC
mA Com
REMOTE
CALIBRATION
LEAD
INSERT PLUG
INTO CAL JACK
Caution:
The AMC-SIR Refrigerant Gas sensor/transmitter must be in operation for 60 minutes
before calibration can be performed! Unless otherwise specified for the application, it
is recommended that the sensors be tested a minimum of twice a year and calibrated
when necessary.
5.2.1 ZERO VERIFICATION
The zero point should be checked with zero gas. Gas should be applied at 0.5lpm using the
AMC-FL1 calibration adapter, as shown in Figure 5-1.Once the sensor has been completely
purged, the output measured at the cal jack should be between 3.9 - 4.1mA. If the measured
value is:
Within this expected range proceed to Span Verification.
Greater than 4.8mA or less than 3.2mA, then an on site calibration will be required with
Armstrong Monitoring to recalibrate the sensor.
Slight zero deviations on the other hand can be re-adjusted using the Zero Recalibration
Procedure below.
Caution:
Only use pure zero gas consisting of nitrogen or air.
TRANSMITTER HOUSING REMOVED FOR CLARITY
JP2
JP3
STATUS LEDs 1-3
TB1
TO
TRANSMITTER
J1
LED1
POWER
CALIBRATION
ADAPTER
Figure 5-1 Cal Meter Setup
TP1
V+
TP2
SIG
TB2
TO MONITOR
CHG
RS-
RS+
V+
SigV
Ret
GND
TP3
GND
14
REGULATOR
CALIBRATION
GAS
CYLINDER