Det-Tronics MOS H2S Gas Sensor User Manual

Page 13

95-8532

1.4

Setpoints
The Infiniti Transmitter has three independent alarm

outputs (low, high and auxiliary), with field selectable

setpoints. For both relay and non-relay models, these

setpoints correspond to the HI, AUX, and LO ALARM

indicators on the display.

Calibration Gas Concentration
The calibration gas concentration is displayed but is not

adjustable. The Det-Tronics 40 ppm Ampoule Calibration

Kit should be used to ensure proper calibration.

IMPORTANT

40 ppm H

S in air must be used for calibrating the

MOS H

S sensor. Compressed H

S gas cylinders

are not recommended.

Latching or Non-latching Relays
The Low and Auxiliary alarm relays are programmable

as a group for either latching or non-latching operation.

“LATCH” indicates that they will latch upon alarm and the

unit must be reset to clear. “nonLATCH” indicates that

they will automatically clear when the alarm clears. The

High alarm relay is always latching.

alarm Relays Normally Energized or Normally
De-Energized
The three alarm relays (High, Low and Auxiliary) are

programmed as a group. “DE-ENERG” indicates that

the three alarm relays will be normally de-energized and

will energize upon alarm. “ENERG” indicates that the

three alarm relays will be normally energized and will de-

energize upon alarm.

External Calibration
Calibration procedures are normally initiated and

executed using the Cal Magnet to activate the CAL/

RESET switch. Choose “EXTCAL YES” during the setup

procedure to allow the additional use of the external reset

input terminal for initiating and executing a calibration

procedure.

4-20 Milliampere Calibration
The 4 to 20 ma current loop is factory calibrated. Perform

the “4-20 CAL YES” function in the Setup procedure if a

current loop output other than 4 to 20 ma is required. The

calibrated 4 to 20 ma output remains linear.

Calibration Current
The current output during Calibration and while in the

Setup mode is factory set for 2 ma. Perform the “SET

CAL CURRENT” function in the Setup procedure if an

output current other than 2 ma is required.

Refer to the “Setup Procedure” section for complete

instructions.

INfINITI OUTpUTS
Refer to Table 3 for a description of Infiniti standard 4 to

20 ma outputs and relay output programming options.

MODES OF OPERATION

Refer to Table 4 for a description of Infiniti modes of

operation.