Intended Use - Prosense PQ Series Installation And User Manual

Intended Use

The PQ series detectors are intended to be used for stationary, continuous monitoring for
combustible gas/air or vapour/air mixtures below the Lower Explosion Limit (LEL) and toxic
gas/air mixtures in particule per million (PPM) units. The detectors are marked by the device
categories II 2G that can be operated in hazardous areas with potentially explosive
atmospheres of zones 1 and 2. The type of protection for gas explosion protection according
to device category 2 (zones 1 or 2) is flameproof enclosure and increased safety, "db". The
enclosure protection is IP 65.
According to the ATEX Directive 2014/34/EU the detector is an assembly consisting of three
components (Sensor Head, enclosure and cable gland), where all these three components are
type approved according to ATEX Directive 2014/34/EU and marked by the device category II
2G. Thus this detector is suitable to be operated in hazardous areas with potentially explosive
atmospheres of zone 1 and zone 2. The PQ series detector comprises a gas sensor type Ex-
proof (protection type flameproof enclosure db type). PQ Series detector for flammable gases
performs % 0 to % 100 LEL measurement range; for toxic gases the measurement range would
be vary. The measurement range and environmental conditions are written on each detector
label.
Hazardous area classifications:
Zone 0: An area classified as Zone 0 will have ignitable concentrations of flammable gases,
vapours or liquids either continuously present or present for long periods of time under
normal operating conditions
Zone 1: An area classified as Zone 1 is likely to have ignitable concentrations of flammable
gases, vapours or liquids present under normal operating conditions. Flameproof (Ex db)
detectors are suitable for use in Zone 1.
Zone 2: An area classified as Zone 2 is not likely to have ignitable concentrations of flammable
gases, vapours or liquids present under normal operating conditions. Flameproof (Ex db)
detectors are suitable for use in Zone 2.
Not to be used in oxygen enriched atmospheres.
PQ series with pelistör sensor for flammable gas detectors are designed to detect gases or
vapours in air and not inert or oxygen deficient atmospheres. PQ oxygen detectors can
measure in oxygen deficient atmospheres.
In conjunction with the central controllers Prosense detectors with preadjusted alarm
thresholds audible and visible alarm devices or automatic countermeasures can be activated
before the detected gases or vapours can form dangerous flammable or toxic mixtures with
air. Please be alerted in following special conditions may have impact on measuring function
due to the nature of measuring method:
PRS-UM-PQ-EN-Rev.05-18.06.2020 6