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DAR 7 / DAR 25 / DAR 40 / DAR 60 / DAR 120
Pressure transmitter in stainless steel construction
14114422.05 01/2017
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Features
Dimensions
 Universal pressure transmitters for measuring pressure in liquid and
gaseous media in refrigeration systems
 Conversion of pressure into standardised electrical current signal
4...20 mA
 Following designs for different measurement ranges
DAR 7
-0,5...7 bar = 4...20 mA
DAR 25
0...25 bar = 4...20 mA
DAR 40
0...40 bar = 4...20 mA
DAR 60
0...60 bar = 4...20 mA
DAR 120
0...120 bar = 4...20 mA
 Compact design with integrated signal amplifier
 Polarity-safe, plug-in connection via two-wire pre-assembled
connecting cable (3.5m) with M12 connector plugs
 All welded metal measuring cell with high overload safety
 No mechanical ageing, high temperature resistance
 Media compatibility with all standard refrigerants including
propane / R290, propene / R1270, ammonia / R717 and
carbon dioxide / R744
 Thread standardised for refrigeration equipment
(7/16"-20UNF-2A or 1/4"-NPT)
3.5 m cable with connector plug
Dimensions
3.5 m cable with connector plug
Characteristic curves
Current
I / mA
4
5
6
7
8
9
10
11
DAR 7
p / bar
-0,50
-0,03
0,44
0,91
1,38
1,84
2,31
2,78
DAR 25
p / bar
0,00
1,60
3,10
4,70
6,30
7,80
9,40
10,90
DAR 40
p / bar
0,00
2,50
5,00
7,50
10,00
12,50
15,00
17,50
DAR 60
p / bar
0,00
3,80
7,50
11,30
15,00
18,80
22,50
26,30
DAR 120
p / bar
0,00
7,50
15,00
22,50
30,00
37,50
45,00
52,50
Current
I / mA
12
13
14
15
16
17
18
19
20
DAR 7
p / bar
3,25
3,72
4,19
4,66
5,13
5,59
6,06
6,53
7,00
DAR 25
p / bar
12,50
14,10
15,60
17,20
18,80
20,30
21,90
23,40
25,00
DAR 40
p / bar
20,00
22,50
25,00
27,50
30,00
32,50
35,00
37,50
40,00
DAR 60
p / bar
30,00
33,80
37,50
41,30
45,00
48,80
52,50
56,30
60,00
DAR 120
p / bar
60,00
67,50
75,00
82,50
90,00
97,50
105,00
112,50
120,00
DAR 7 / DAR 25 / DAR 40 / DAR 60
DAR 120
DARxxx_2017-01_EN
Subject to technical changes
Page 1 of 2
DAR 7 / DAR 25 / DAR 40 / DAR 60 / DAR 120
Pressure transmitter in stainless steel construction
14114422.05 01/2017
Installation and safety instructions
Technical data
Please make sure before installation, commissioning and operation that the appropriate pressure
transmitter has been selected in terms of measuring range, design and wetted materials
(corrosion) that must be qualified for the specific measuring conditions.
Furthermore the corresponding national safety regulations (e.g. VDE 0100) have to be observed!
Non-observance can result in serious injury and/or damage to the equipment.
For hazardous media such as oxygen, acetylene, flammable or toxic gases or liquids, and
refrigeration plants, compressors, etc., in addition to all standard regulations the appropriate
existing codes or regulations must also be followed. Residual media in dismounted pressure
transmitters can result in a risk to persons, the environment and equipment. Take sufficient
precautionary measures.
Supply voltage
(output signal contact voltage UB)
Electrical connection via
preassembled cable (3.5m)
and M12 connector plug
Output
Any operation other than the one described is regarded as improper and must be avoided. If
faults cannot be eliminated shut down the device immediately and secure it from being put back
into operation inadvertently. Repairs must only be carried out by the manufacturer. Interferences
or changes at the equipment are inadmissible.
Open the connections only after the system has been depressurised.
Installation and maintenance works of pressure transducers may be carried out only by skilled
personnel authorized by the plant operator. Do not exceed the overload limit of the corresponding measurement range or pressure transmitter!
The pressure transmitters are connected to the refrigerant circuit via the standard thread.
Installation requires a 24mm open-end wrench, which is to be operated with the maximum
tightening torque of 20Nm.
To avoid condensation on the housing and
thus possible penetration of moisture inside
the sensor, care mus be taken that the pressure
transmitter housing always has a temperature
above the current dew point. The thermal
influence on the pressure transmitter via the
pipelines mus be kept as low as possible.
Pipeline section
without insulation
for thermal
adaptation to
ambient
temperature
Insulated
pipeline
section
It is therefore not permitted, for example, to install the pressure transmitter directly to suction
headers or other lines with large pipe cross sections. The connection should always be effected
via a non-insulated line with a minimum Øinside of 4mm and a minimum length of 200 mm.
Electrical cable connection is made via a presassembled cable with a standardised M12 connector plug. Damage to the cable insulation can result in leaking and thus water penetration and
false measurement results.
DARxxx_2017-01_EN
Fluid temperature:
Ambient temperature:
Measurement range (in bar):
Overload limit (in bar):
Allowable max. load:
Settling time (10…90%):
Accuracy:
at 25°C →
at 0°C →
at -20°C →
BFSL →
stability acc. to DIN61298-2:1995
Short-circuit strength:
Inverse-polarity protection:
Overvoltage protection:
Insulationvoltage:
Protection class:
DAR 7 / DAR 25
DAR 40 / DAR 60 / DAR 120
Weight:
Thread:
DAR 7 / DAR 25 / DAR 40 / DAR 60
DAR 120
CE conformity
7 - 30 VDC
brown (BW) supply voltage + (7...30VDC) - PIN 1
white (WH) measurement signal (4...20mA) - PIN 3
4...20mA two-wire, reverse-polarity-proof
(load-independent current in power supply)
-40...+100°C
-30...+85°C
DAR 7
DAR 25
DAR 40
DAR 60
-0,5...7
0...25
0...40
0...60
DAR 7
DAR 25
DAR 40
DAR 60
20 bar
50 bar
80 bar
120 bar
RA <= (UB- 7V) / 0,02 A
<= 5 ms
DAR 7
DAR 25
DAR 40
DAR 60
±0,8%,
±0,8%,
±0,8%,
±0,8%,
±1,0%,
±1,3%,
±1,0%,
±1,0%,
±1,2%
±1,8%
±1,2%
±1,2%
±0,4%
±0,4%
±0,4%
±0,4%
±0,2%
±0,2%
±0,2%
±0,2%
Total of linearity, hysteresis and repeatability
S+ about 0V
UB about 0V
Max. DC 36V
DC 500V
DAR 120
0...120
DAR 120
3 20 bar
DAR 120
±0,8%,
±1,0%,
±1,2%
±0,4%
±0,2%
IP65 (in plugged-in condition)
IP67 (in plugged-in condition)
approx. 80 g
7/16"-20UNF-2A, length 15 mm
1/4"-NPT, length 13 mm
EMC directive 2014/30/EU, Emissions EN 61326
(group 1; class B) and resistance to interference
(industrial sector)
Please also observe the technical documentation of the measurement or control electronics used.
The document will automatically become invalid when superseded by a new technical description
of the devices.
Subject to technical changes
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