D12
EX-IR
Gas Transmitter with IR Smart Sensor
Dec 2019 ( 85-0004 Rev A)
44
Sensor Span Calibration
Span calibration* requires a bottled “span-gas” with a 500 cc/min regulator, calibration adapter, and a
convenient length of ¼” tubing. The gas type and concentration used depends on the type of sensor
installed. Check with the factory if you are uncertain about which gas to use.
Referring to Figure 41, slip the calibration adapter
onto the exposed end of the sensor and connect one
end of the tubing (1), connect the other end of tubing
to the cylinder’s regulator (2). Do not open the gas
valve until instructed below.
* Perform the Zero calibration prior to the Span
calibration
.
Figure 41 Sensor Span Cal. Setup
Select the Span method from the Sensor
Calibration menu, as shown in Figure 42
15
.
This will clear and inhibit alarms at the
transmitter, and hold the current loop output at
4mAfor up to 30 minutes of no key activity.
Figure 42. Sensor Span Cal. Menus
If a target gas, like ethane, uses a propane k-
factor, you will have the option of spanning to
either the target gas or to propane. In this case,
propane is considered to be a “surrogate” gas.
Figure 43 Span to Surrogate Gas.
15
The span method is also directly accessible from the main menu.
%LEL
Methane
►span
…Calibration>Span
0
Calibration
Zero History
►
Span
Temp= 21.1°C
…Setup >Sensor>Calibration
%LEL
Ethane
►span surrogt
…Calibration>Span
0
Select Gas
Ethane
►
Propane
…Span>Select Gas
