PT495 Series Detector
(Ultra1000)
Rev 5.11
5
Overview
PT495 series single point fixed detector and transmitter for the detection of toxic and
flammable gases in ambient air. Detector is designed and built suitable to be used in
hazardous area. The detector is approved for use in Class I Division 1 & 2 classified areas
(North America) or Zone 1 and 2 (International).
The transmitter features a display and three programmable relays for controlling external
devices like alarms, sirens, switches and solenoid valves. The transmitter provides
an industry standard 3-wire, 4-20mA (source) output for connection to a gas detection
system or a PLC.
Table I lists the target gases and the detection ranges. The unit displays the gas concentration
and transmits a linear 4-20mA analog output signal proportional to the gas concentration
displayed. The unit is also equipped with 3 forms “C” type alarm relay contacts. Two (2)
alarm relays are fully programmable as Low and High alarms and 1 for sensor Fault or
Malfunction.
The detector also features a non-intrusive calibration. Calibration is performed by activating an
internal magnetic switch. Calibration is an easy automated procedure that does not require
any manual adjustment to the unit. All calibration and alarm configuration data is retained in a
non-volatile memory.
Field Cable Entry (x2)
¾” NPT
One Entry with Ex Plug
Stainless Steel (316)
Sensor Head Assembly
Transmitter assembly
Mounting Holes (X2)
Earth Ground Lug
Figure 1. PT495 Series Detector
