Introduction - Prosense PQ Series Installation And User Manual

Introduction

The Prosense comprises a gas detector body and a choice of sensors heads for detecting
flammable gases, toxic gases and oxygen. The construction of Prosense PQ Series detectors
allows it to be used in hazardous area locations; it may also be used in other areas not
classified as hazardous.
Prosense PQ Series detectors can be configured with a wide range of different sensors may be
used to detect a broader range of target gases. The detector can be configured with optional
relay board features three programmable relays for controlling external equipment e.g.
alarms, sirens, valves or switches. The detector provides an industry standard 3-wire, 4-20mA
output for connection to a dedicated gas detection control system or PLC. It can also provide
RS485 serial communication with integrated onboard devices.
PQ Series detectors are available as PQN and PQD names. PQD and PQN are uses same
electronics, sensors, sensor heads and firmware. PQD has an integrated screen on detector
itself and the cover has window made from glass while PQN has aluminium cover without
window as it does not have screen.
PQ Series gas detectors for monitoring a very wide range of toxic and flammable gases and
oxygen. PQ series are available as Flameproof (Ex db) detectors suitable for use in Zone 1 or 2
hazardous areas. Please refer to the certification label on the detector junction box to identify
the type of certification that relates to the product supplied. Hazardous area definitions are
shown in the Hazardous area classifications section on page 6.
Note: if no certification label is fitted to the junction box, the detector is not certified for use
in hazardous areas.
PQ Series detector labels are provided in Diagram-1. Prosense PQ series gas detectors may be
installed in hazardous area with flammable gases, vapours, and mist, group II, category 2G,
maximum superficial permissible temperature 70°C.
Device category 2G, Identification II 2G
Ex db IIC T6 Gb (Tamb = -40 °C ÷+70 °C) – For explosion protection
(Tamb = -20 °C ÷+60 °C) – For performance
It means: (European Community logo for ATEX applications) – group II (potentially
explosive atmospheres – surface application – OTHER than mines)
Category 2G ( G => Gas ) – Zone 1 and Zone 2
Ex db => protection mode: explosion proof enclosure
IIC => define kind of gases
T6 => Temperature class -- Maximum allowable surface temperature.
IP 65 => Mechanical protection degree – protection against solid, dust and liquid.
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