Enmet EX-5130 Manual do Utilizador descarregar pdf (Página 10)

EX-5130-IS ENMET Corporation

5.2 Calibration of the EX-5130-IS

Calibration is the process of setting the instrument up to read accurately when exposed to a target gas. The Zero

function sets the clean air reference point and the Span function sets the sensitivity of the instrument.

Initial Calibration: Wait 24 hours after initially supplying power to the EX-5130-IS sensor/transmitter (S/T) before

initial calibration. The S/T 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 magnets from outside the enclosure through the

and

SELECT

switches. Do Not open the S/T unless the area is de-classified.

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 EX-5130-IS transmitters.

Calibration equipment is available from ENMET Corporation to calibrate the EX-5130-IS sensor/transmitters. A

calibration adapter will have a fitting for the gas cylinder on one side, and a cover to go over the sensor housing on the

other.

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

Another cylinder is used to provide the Span reference point for calibration. Depending on the instrument calibration,

the Span gas may be the same gas that the instrument is calibrated to display, or it may be another gas, which ENMET

has found to have a similar response.

Figure 4: Calibration Adapter EX-5130-IS Sensor/Transmitter

Table 2: Examples of Calibration Gas

Gas Range Alarm 1* Alarm 2* Alarm 3*

Carbon Monoxide 0 – 500 PPM 35 PPM 50 PPM 200 PPM

Chlorine 0 – 10 PPM 0.5 PPM 1 PPM 5 PPM

Bromine 0 – 10 PPM 1 PPM 2 PPM 3 PPM

Hydrogen Sulfide 0 – 100 PPM 10 PPM 20 PPM 50 PPM

Oxygen 0 – 30% by Vol 17% by Vol 19.5% by Vol 23.5% by Vol

OTE

: These internal sensor/transmitter alarms are independent of the 4-20mA Controller alarm point settings.

Regulator

Gas Cylinder

Select

Output, for Gas

Input, for Calibration

or Optional Gas Sampling

Calibration Cover

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