Det-Tronics U9500 Infiniti Gas Transmitter User Manual

Page 17

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10.1

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 programmed calibration gas concentration is also

displayed and adjustable. This known concentration

(typically one half of the instrument’s full scale detection

range) of the actual gas or vapor that is expected to be

detected should be used to calibrate the system.

Det-Tronics calibration gas should be used to ensure

proper system calibration performance and accuracy.

iMPOrTanT

The calibration gas concentration setting typically
matches the concentration of the gas used to
perform the calibration (printed on label of
calibration gas cylinder). Refer to the “Calibration”
section of this manual for details.

Latching or Non-latching Relays
The Low, Auxiliary and High 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.

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.

Automatic or Manual Calibration
Manual calibration requires that the operator use the Cal

magnet to activate the CAL/RESET switch, signaling an

acceptance of the present calibration reading. Auto Cal

is described in the “Calibration” section of this manual.

External Calibration
Calibration procedures are normally initiated and

executed using the Cal Magnet to activate the CAL/

RESET switch. Choose “YES EXT CAL” during the setup

procedure to allow the additional use of the external reset

input terminal for initiating and executing a calibration

procedure. See Figure 9 for switch wiring.

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

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

recalibration is required. A current meter must be placed

in the loop to perform this function.

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 SENSOR COMPATIBILITY
Refer to Table 6 for a list of acceptable sensor inputs to

the Infiniti by model.

INFINITI OUTPUTS
Refer to Table 7 for a description of Infiniti standard 4 to

20 mA outputs and relay output programming options.

mODES OF OPERATION

Refer to Table 8 for a description of Infiniti modes of

operation.