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Detectable gases, Outputs, Data logging capability – Det-Tronics PIRECL Infrared Carbon Dioxide Gas Detector PointWatch Eclipse User Manual

Page 4: Optional third party addressable modules

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2

95-8676

2.1

DeTeCTable GaSeS
The model PIRECL detector is capable of detecting

CO

2

(Carbon Dioxide).

oUTpUTS
Standard
The standard version provides an isolated/non-isolated

4-20 mA current loop for connection to analog input

devices.

optional relays
An optional relay output board providing two

programmable alarm relay outputs and one fault

relay output can be factory installed with the standard

version. All relays are sealed and provide form C (NO/

NC) contacts. The high and low alarm relay settings

are programmable and can be set for latching or non-

latching operation. The low alarm cannot be set above

the high alarm threshold. Alarm configuration can be

done with the HART or MODBUS interface.

The onboard tri-color LED indicates a LOW alarm

condition via a flashing red color, and a HIGH alarm

condition via a steady red color. The Eclipse internal

magnetic switch or HART Field Communicator can be

used to reset latched alarms. A short-duration magnetic

switch activation of 1 second will reset latched alarms.

Holding the magnetic switch closed for 2 seconds will

start the calibration sequence. The external calibration

line will not reset latched alarm relays.

When the optional relay output board is specified, the

PIRECL’s approval rating is Ex d only.

NoTe

Refer to “Alarm Relays” in the Specifications
section of this manual for important information
regarding alarm relays.

DaTa loGGInG CapabIlITy
Non-volatile memory is provided to save the 10 most

recent calibrations, alarm/fault events, and minimum/

maximum operating temperature history. An hour meter

(running operational hours since startup) is provided to

record operating service time and to give an indication

of the relative time between events. This information is

accessible using HART or MODBUS communication.

opTIonal ThIrD parTy aDDreSSable MoDUleS
The PIRECL is electrically compatible with third party

addressable modules, provided the module fits within

the PIRECL wiring compartment. Whenever a third party

addressable module is installed, the PIRECL’s Ex e rating

is void, and only the Ex d rating is valid. Installation of

a third party addressable module requires a specially

labeled PIRECL model to ensure valid product approvals.

SIGNAL PROCESSING

ELECTRONICS

GAS

CONCENTRATION

(%/Volume or PPM)

IR SOURCE

IR TRANSPARENT

WINDOW

OPTICAL

BEAM SPLITTER

MEASUREMENT

SIGNAL DETECTOR

REFERENCE

SIGNAL DETECTOR

OPTICAL

FILTERS

PERMEABLE

GAS CELL

SAPPHIRE

MIRROR

figure 1—Measurement Scheme for Infrared Gas Detector