Dräger PIR 7000 Technical Handbook

7
Design
Design
The Dräger PIR 7000 is an infrared gas transmitter for the detection of flammable
hydrocarbons in the ambient air or in other suitable atmospheres.
The Dräger PIR 7200 is used for detecting carbon dioxide (CO
2
) in the ambient air or in other
suitable atmospheres.
The optical 4-beam technology ensures utmost signal stability for all models over long periods.
The gas transmitter is available with an M25 or a 3/4 inch NPT thread.
The Dräger PIR 7000 type 334 model provides comparable sensitivity in the measuring
range of the Lower Explosion Limit (LEL) for many gases and vapours containing
hydrocarbons such as methane, propane and ethylene.
The Dräger PIR 7000 type 340 model offers a high sensitivity for propane and alcanes of
greater length such as octane and nonane. This allows for more sensitive measurements and
alarm thresholds in the ppm range. Methane and ethylene are more weakly detectable with
this model (see “Cross-Sensitivities Dräger PIR 7000 Type 340” on page 76).
The Dräger PIR 7200 model is used to detect carbon dioxide (CO
2
) in a recommended
measuring range from 0 to 30 % vol. Lower concentrations are sensitively detected so that
even here a measuring range and corresponding alarm thresholds in the ppm range are
possible.
The gas transmitters are designed for use under the most adverse conditions (e. g. offshore).
A robust stainless steel housing protects the electronic and the optical components. Thus
only non-corrosive materials are subjected to the environment.
Due to the extensive range of accessories, the device
can be adapted to almost any application.
Status indicator, flowcell and bump test adapter display different device statuses: normal
operation is indicated by a continuous green light and faults are indicated by a continuous
yellow light.
The device offers a fast and simple possibility for calibration of zero-point and sensitivity
(span). The magnetic wand is used to carry out corresponding calibration functions. The lights
support the calibration procedure with simple blink patterns.
Optionally the Dräger PIR 7000 is available with a HART
®
interface.
The Dräger PIR 7200 is equipped with the HART
®
interface in every version.
All models have a 4 to 20 mA current output (current source or current sink, automatically
detected) and a serial "one-wire" interface for the configuration via Dräger CC-Vision GDS
software.

Dräger PIR 7000 Specifications

General

Detection Principle	Infrared (IR)
Pressure Range	700 to 1300 hPa
Ingress Protection	IP66/67
Gases Detected	Hydrocarbons
Measurement Range	0 - 100 %LEL (Lower Explosive Limit) or 0 - 100 vol.%
Operating Temperature	-40 to +65 °C
Output Signal	4-20 mA
Housing Material	Stainless steel
Certifications	ATEX, IECEx, UL, CSA
Response Time	t90 ≤ 4 s