halstrup-walcher PS 18 User manual

Instruction Manual
PS 18 Differential
Pressure
Transducer
halstrup-walcher GmbH
Stegener Straße 10
D-79199 Kirchzarten
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]om
Internet: www.halstrup-walcher.com
Document 7100.003814 Version 1.1 02/2010

PS18 Instruction Manual
2
Table of Contents
1 Safety precautions ..................................................................................................................4
1.1 Appropriate use .................................................................................................................4
1.2 Shipping, assembly, electrical connections and start-up...................................................4
1.3 Troubleshooting, maintenance, repairs, disposal ..............................................................4
1.4 Symbols.............................................................................................................................5
2 Instrument description.............................................................................................................6
3 Start-up ...................................................................................................................................6
3.1 Features.............................................................................................................................6
3.2 Instrument connections:.....................................................................................................7
4 Calibrating the zero point........................................................................................................8
5 Troubleshooting ......................................................................................................................8
6 Technical data.........................................................................................................................9
7 Dimension drawings................................................................................................................11

PS18 Instruction Manual
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Purpose of instruction manual
This instruction manual describes the features of the PS18 differential pressure
transducer and provides guidelines for its use.
Improper use of this instrument or failure to follow these instructions may cause injury
or equipment damage. All individuals responsible for operating this instrument must
therefore be properly trained and aware of the hazards, and must carefully follow
these operating instructions and the safety precautions detailed within. Contact the
manufacturer if you do not understand any part of this instruction manual.
Handle this manual with care:
It must be readily available throughout the lifecycle of the instrument.
It must be provided to any individuals who assume responsibility for operating the
instrument at a later date.
It must include any supplementary materials provided by the manufacturer.
The manufacturer reserves the right to continue developing this instrument model
without documenting such development in each individual case. The manufacturer
will be happy to determine whether this manual is up-to-date.
Conformity
This instrument corresponds to the state of the art and meets all legal requirements
set forth in EC directives as evidenced by the CE label.
© 2005
The manufacturer owns the copyright to this instruction manual. This manual contains
data, instructions and drawings pertaining to the features and usage of this
instrument; copying this manual in part or in full or distributing it to third parties is
prohibited.

PS18 Instruction Manual
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1 Safety precautions
1.1 Appropriate use
In addition to differential pressure data, the PS18 differential pressure transducer also
records positive and negative overpressures.
Always observe the operating requirements—particularly the permissible supply
voltage—indicated on the rating plate and in the ”Technical data” section of this
manual.
The instrument may only be handled as indicated in this manual. Modifications to the
instrument are prohibited. The manufacturer is not liable for damages caused by
improper use or failure to follow these instructions. Violations of this type render all
warranty claims null and void.
1.2 Shipping, assembly, electrical connections and start-up
Do not close the pressure input ports when shipping, as changes in barometric
pressure could damage instruments with low measuring ranges.
Only technical personnel who are appropriately trained and authorized by the
operator of the facility may assemble the instrument and set up its electrical
connections.
The instrument may only be operated by appropriately trained individuals who have
been authorized by the operator of the facility.
Pressurized air or breath is not to be used for performance tests, as this could
damage instruments with low measurement ranges.
Measurement errors may occur if the instrument is not kept protected from sunlight.
Specific safety precautions are given in individual sections of this manual.
1.3 Troubleshooting, maintenance, repairs, disposal
The individual responsible for the electrical connections must be notified immediately
if the instrument is damaged or if errors occur that cannot be corrected as indicated in
section 5.
This individual must take the instrument out of service until the error has been
corrected and ensure that it cannot be used unintentionally.
Always unplug the supply voltage before opening the instrument!
This instrument requires no maintenance.
Only the manufacturer may perform repairs that require the housing to be opened.

PS18 Instruction Manual
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The electronic components of the instrument contain environmentally hazardous
materials and materials that can be reused. For this reason the instrument must be
recycled in accordance with the environmental guidelines of the jurisdiction in
question once it has been taken permanently out of service.
1.4 Symbols
The symbols given below are used throughout this manual to indicate instances when
improper operation could result in the following hazards:
WARNING! This warns you of a potential hazard that could lead to bodily injury up
to and including death if the corresponding instructions are not followed.
WARNING: This warns you of a potential hazard that could lead to significant
property damage if corresponding instructions are not followed.
INFORMATION: This indicates that the corresponding information is important
for operating the instrument properly.

PS18 Instruction Manual
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2 Instrument description
The PS 18 pressure transducer is a pneumatic, electrical sensor for measuring
overpressures, vacuum pressures and differential pressures. Typical applications
include, for instance, the monitoring of filters in air-conditioning and ventilation ducts.
At the heart of the transducer is a pressure measurement capsule with a beryllium
bronze membrane spring, which is displaced by the pressure difference between the
two chambers of the measurement capsule. Inductive displacement transducers
measure membrane deflection without contacting the membrane. The instrument has
no frictional parts or parts subject to mechanical wear.
3 Start-up
3.1 Features
Although the PS 18 pressure transducer is highly robust, it is nevertheless a precision
instrument and should be handled with care. Avoid mounting the PS11/PK11 in the
direct vicinity of any sources of heat or radiation. Ideally, the instrument should be
mounted vertically (ports should be pointing down) and on a wall not subject to
vibration.
When connecting pressure to the transducer, use the following table to ensure that
the sign of the pressure (+ or -) is correct.
Measuring task
Connect pressure to
Example
overpressure / pos. differential
pressure
+ input port
0...1 kPa
vacuum / neg. differential pressure
- input port
0...- 500 Pa

PS18 Instruction Manual
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3.2 Instrument connections:
The supply voltage for the PS 18 should be connected at terminals 2 and 3. The
pressure transducer is protected against reverse polarity of the supply voltage.
The PS 18 output signal is available at signal terminals 1 and 2. The output voltage is
protected against short circuits for a short period.
Signal U (24V) GND
B
99
78.5
25.5
30.8
2
9.5-0.5
1 32
2xØ4.5
18
88.5
67.5
45±1
68
halstrup
wa cher
Model PS 18:
Terminal ST3
Assignment
Pin 3
24 VAC or +24 VDC:
Pin 2
24 VAC or GND
(ground)
Pin 1
output signal
0…10 V
0…20 mA
4…20 mA
The power supply is connected at pins 2 and 3; please make certain that pin 2 is the
internal reference (ground).
The output signal lies between pins 1 and 2.
Observe the required supply voltage (see rating plate) as well as the connection
diagram located on the housing cover / circuit board mount.
zero point (pot. 0)
1 2 3

PS18 Instruction Manual
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4 Calibrating the zero point
Please remember that it takes roughly 30 to 60 minutes for the pressure
transducer to warm up after it is switched on. The output signal may not
remain stable during this period.
It is recommended that the zero point after a long operating time
(approximately 6 months) is checked and if necessary calibrate it again.
The zero point can be calibrated using potentiometer 0 after the pressure transducer
has warmed up. Use the following table to look up the value to which the analogue
output must be set when the ports are open; this value is dependent upon the output
signal.
measurement
range
0...10 V
0...20 mA
4...20 mA
zero point
0.00 V
0.00 mA
4.00 mA
5 Troubleshooting
Error description
Potential cause
Corrective action
no output signal
supply voltage is not connected
incorrect supply voltage
connect correct supply voltage
connect the correct supply
voltage (see rating plate).
output signal is constant,
despite change in
pressure
pressure ports reversed
connect the pressure as
described in Section 3.1
output signal incorrect
defective pressure
measurement cell
send the instrument to the
manufacturer for repair
zero point cannot be
adjusted using P0
defective pressure
measurement cell
send the instrument to the
manufacturer for repair

PS18 Instruction Manual
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6 Technical data
Measurement data
measurement ranges
0...250 Pa to 0...20 kPa
(others available upon request)
overload capacity
10 x the final value of the measurement range
(for measurement ranges 20 kPa)
2 x the final value of the measurement range
(for measurement ranges > 20 kPa)
hysteresis
0.1 %
warm-up period
approx. 30 min.
time required for adjustment
approx. 20 ms (up to 5 s available upon request)
deviation from characteristic curve
(setting limiting value)
typically 2.5 %
temperature-dependent drift in zero
point
0.1%/ K (within the +10°C...+50 °C range)
temperature-dependent drift in
measurement range
0.1%/ K (within the +10°C...+50 °C range)
max. system pressure
10 kPa for measurement ranges ≤10 kPa
for measurement ranges >10 kPa, max. nominal
pressure
Ambient conditions
medium
air, all non-aggressive gases
operating temperature
+10° C to +60° C
storage temperature
-10° C to +70° C
relative humidity
0…80 %
EMC standards
EN 50 081 part 1 and EN 50 082 part 1
conformity
declaration of conformity available upon request

PS18 Instruction Manual
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Electrical data
power consumption
max. 0.5 W
supply voltage
24 VDC ± 10 %
24 VAC ±10 %, 50/60 Hz
output signal
0 to 10 V, 0 to 20 mA or 4 to 20 mA
minimum load resistance RL
RL2 kfor an output voltage of 0...10 V
maximum effect of load resistance = 0.3%
maximum output load RB
RB=500 
output load dependence: < 0.3 %
Physical data
pressure port
Ø 6.5 mm for NW5 tubing
(interior tubing diameter = 5 mm)
electrical connection
screw terminals for cables up to 2.5 mm2
mounting orientation
vertical
(if horizontal, use potentiometer 0 to reset)
dimensions (w x h x d)
99 x 32.8 x 88.5 mm
protection class
IP20
weight
0.4 kg
options
linearity protocol
DKD calibration certificate
output signal attenuation up to 5 s
Appendix A: Parts in contact with measurement medium
Beryllium bronze CuBe2 Araldite CY236 / HY988
Mu metal (nickel alloy) Loctite 242e
Brass CuZn39Pb3 Carbonyl iron
Aluminium AlCuMgPb / AlMg3 KEL (FPM: fluorinated rubber)
Silicon (tubing), optional: Viton Vepuran Vu 4457/51
Crastin (PTBP) UHU-Plus endfest 300 binder

PS18 Instruction Manual
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7 Dimension drawings
Signal U (24V) GND
B
99
78.5
25.5
30.8
2
9.5-0.5
1 32
2xØ4.5
18
88.5
67.5
45±1
68
halstrup
wa cher
7100003814_PS18_eng.doc 01.02.2018 Ht/Su/Ze
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