Front view, Side view, Figure 7: calibration adapter – ENMET AM-5175 User Manual

Page 13

AM-5175

ENMET Corporation

5.2 Calibration of the AM-5175

Calibration is the process of setting the instrument up to read accurately when exposed to the target gas. The Zero function sets
the clean air reference point and the Span function sets the sensitivity of the instrument.

Initial Calibration:

Wait at least 3 – 4 hours after initially supplying power to the

AM-5175

instrument before initial

calibration, overnight is preferred. The

AM-5175

has been pre-calibrated at the factory, and initial field calibration should

result in only fine-tuning to circuit, as well as a way to check that installation is successful. It is not necessary to open the
enclosure to make adjustment. The calibration functions are operated with pushbuttons from outside the enclosure through the

MENU

and

SELECT

switches.

Calibration Zero and Span functions are two separate procedures. They operate independently of each other. It is
recommended that the Zero procedure be done prior to the Span procedure.

ENMET

Corporation recommends at least quarterly calibration of the

AM-5175

instrument.

Calibration equipment is available from

ENMET

Corporation to calibrate the

AM-5175

instrument.

• Calibration adapter, a length of tubing with a regulator for the gas cylinder on one end, and a calibration cup to connect to

the sensor of the

AM-5175

on the other.

• Gas cylinder, Zero gas 20.9% oxygen or Span gas, factory determined, varies by intent.

Generally, a cylinder of 20.9% Oxygen is used to provide a Zero point or fresh air reference for the calibration.

OTE

Software revision may cause variations of display output.

Select

Front View,

Attaching Calibration Cup

Side View,

Attaching Calibration Cup

Select

Front View

with Cal Cup attached

Side View

with calibration Adapter

Figure 7: Calibration Adapter

Sensor

Gas Cylinder

Regulator

Calibration Cup

To Attach Calibration Cup:

Slide Down over the
retaining posts

To Remove Calibration Cup:

Slide Cup Up off the
retaining posts

Retaining Posts

2 places

Retaining Posts

2 places