Intended Use; Limitations On The Intended Use; Installation And Commissioning; Sensing Head Assembly - Dräger Messkopf Polytron SE Ex PR M1 DQ Instructions For Use Manual

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Installation and commissioning

Name Housing
type
Polytron SE Ex PR M1 M1
DQ
Polytron SE Ex PR M2 M2
DQ
Polytron SE Ex HT M DQ HT
Remote Sensor DQ NPT NPT
Alu
Remote Sensor DQ NPT NPT
Steel
Polytron SE Ex LC M1 DD M1
Polytron SE Ex LC M2 DD M2
1) Temperature range up to 150 °C
3.2

Intended use

The Polytron SE Ex PR M1/2 DQ and SE Ex HT M DQ und SE Ex LC M1/2 DD
as well as Remote Sensor DQ NPT Alu/Steel, SE Ex HT M DQ and SE Ex LC
M1/2 DD sensing heads are intended for fixed-location continuous monitoring of
combustible gas/air and vapour/air mixtures under the Lower Explosive Limit
(LEL) or below 10% of the LEL in atmospheric conditions.
All sensing heads contain sensors with the pressure-resistant enclosure with
"db" type of protection, or housing with "tb" type of protection.
The DrägerSensor PR M DD, HT M DD and PR NPT DD sensors will be
replaced by the DrägerSensor PR M DQ, HT M DQ and PR NPT DQ (S)
sensors. The DD sensors can still be used with the sensing heads.
30
DrägerSen- Measuring
sor range
PR M DQ 0–100 %LEL
PR M DQ 0–100 %LEL
HT M DQ 1)
0–100 %LEL
PR NPT DQ 0–100 %LEL
PR NPT DQ S 0–100 %LEL
LC M 0–10 %LEL
LC M 0–10 %LEL
3.3

Limitations on the intended use

The sensing heads are not approved for use in environments with an increased
oxygen content (>21 Vol% O ). None of the sensing heads and sensors given in
2
this document is certified and approved for operation in oxygen enriched
atmospheres.
4 Installation and commissioning
4.1

Sensing head assembly

4.1.1

Assembling the sensing head

Comply with regulations on electrical equipment in explosion-hazard areas and
with approval conditions!
The approval marking is located either on the lid or the side of the sensing
head housing. During assembly, ensure that the lid and bottom section remain
allocated to one another.
Orientation
Although the Polytron SE Ex PR M1/2 DQ and Remote Sensor DQ NPT
Alu/Steel as well as SE Ex HT M DQ sensing heads can be positioned as
desired during operation, they should preferably be mounted with the sensor's
gas inlet area pointing downwards. For installation in the cover area, mounting
brackets should therefore be used. The Polytron SE Ex LC M1/2 DD sensing
heads should always be fitted with the gas inlet area of the sensor pointing
downwards.
– Install the sensing head at a location with minimal vibration and maximum
temperature stability (no direct sunlight) in the vicinity of a possible leak.
– Consider the full scope of environmental conditions affecting the sensing
head. Avoid external influences such as splashing water, oil, corrosive
aerosols (salt mist), etc. and the possibility of mechanical damage.
– The gas inlet area of the sensor must be protected against water, dust and
mechanical damage, and kept free of contamination at all times. In
particular, paint must not be allowed to seal up the gas inlet opening during
painting work.
– If the sensing head is being used to detect combustible vapours, the ground
clearance should be kept as low as possible, whilst still providing access for
calibration work. Where appropriate, the sensing head should be installed in
a removable position.
Instructions for use |