ENMET EX-6175 - Manual (Page 10)

EX-6175 ENMET Corporation
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3.8 Initial Gas Testing
EX-6175 units are factory calibrated as detailed on the calibration certificate supplied with the instrument. However, it is
always advisable after installation to confirm that the instrument reads zero with no gas present and responds accurately when
presented with an appropriate concentration of the target gas.
The EX-6175 display becomes operational within 60 seconds however; the sensor should be allowed to stabilize for the period
of five to ten minutes before attempting to check the zero setting and gas response.
Refer to Figure 9 showing the arrangement for applying the test gas to the EX-6175 .
1. Before application of the test gas, check that the EX-6175 reads zero with no known gas present in the atmosphere. If
necessary, carry out adjustment of the zero setting as described in section 5.1.1
2. Apply the test gas and allow a sufficient time for the sample to reach the gas detector and for the sensor response to
stabilize.
Carrying out the above procedure, and comparing the results with previous readings, reference the certificate of calibration, will
confirm that the
EX-6175 is functioning correctly, both physically and electrically. There is therefore no requirement for any
further maintenance other than to clean the display window as required.
In the unlikely event that the response has changed from the previous readings, recalibrate the unit. See Section 5.1.1 and 5.1.2.
Figure 9: Appling Test Gas to EX-6175
3.8.1 Suggested calibration Test gas levels.
Oxygen:
Zero 100% N2
Span 20.9% O2
Toxic:
Zero Air (20.9% O2, balance N2) contaminant free.
Span 200ppm CO, 20ppm H2S, 50ppm NH3, 5ppm NO2, 25ppm NO
Certified Test Gas
Cylinder
Sampling Tube
Flow Regulator
Weatherguard, part number 04546-012
Comes with quick release fitting for
connecting to calibration cylinder
regulator assembly.
Calibration Adapter,
part number 03700-057