halstrup-walcher PS11 User manual

Instruction Manual
Differential Pressure
Transducer for Top-hat
Rail Mounting Type PS11,
Type PK11 with Contact
Point
halstrup-walcher GmbH
Stegener Straße 10
D-79199 Kirchzarten
Phone: [phone]
Fax: [phone]
E-mail: [email protected]om
Internet: www.halstrup-walcher.com
Document 7100.003754 Version 2.1 02/2010

Instruction manual PS11/PK11
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 Supply voltage connections in the instrument: .....................................................................7
4 Calibration of the output signals ...........................................................................................7
5 Adjusting the switching threshold .........................................................................................8
6 Troubleshooting....................................................................................................................9
7 Technical data......................................................................................................................9
8 Dimension drawings...........................................................................................................11

Instruction manual PS11/PK11
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Purpose of instruction manual
This instruction manual describes the features of the PS11/PK11 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. Every person who uses the device must therefore read the
manual and understand the possible risks. The instruction manual, and in particular
the safety precautions contained therein, must be followed carefully. 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 device is state of the art. It complies with the legal requirements of EC directives.
This is shown by the CE mark.
© 2005
The manufacturer owns the copyright to this instruction manual. It contains technical
data, instructions and drawings detailing the device’s features and how to use it. It
must not be copied either wholly or in part or made available to third parties.

Instruction manual PS11/PK11
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1 Safety precautions
1.1 Appropriate use
In addition to differential pressure data, the PS11/PK11 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 inlets during shipping. Changes in barometric pressure
may damage devices with low measuring ranges.
Assembly and the electrical connections should only be handled by professionals.
They should be given proper training and be authorised by the operator of the facility.
The instrument may only be operated by appropriately trained individuals who have
been authorized by the operator of the facility.
Do not carry out a function test with compressed or breathable air. This would
damage instruments with low measuring 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 6.
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.
The electronic components of the instrument contain environmentally hazardous
materials and materials that can be reused. The instrument must therefore be sent to

Instruction manual PS11/PK11
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a recycling plant when you no longer wish to use it. The environment codes of your
particular country must be complied with.
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.

Instruction manual PS11/PK11
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2 Instrument description
The Type PS11/PK11 pressure transducer is a pneumatic, electronic sensor for
measuring overpressures, vacuum pressures and differential pressures. As well as two
output signals proportional to the pressure, it also offers the option of a floating contact
point. 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 PS11/PK11 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. The instrument
should be mounted vertically on a 35 mm DIN top hat rail not subject to vibration.
The smoothed supply voltage 24 VDC (+20% / -15 %) should be connected at the
terminals indicated in the connection diagram (see below).
The pressure (+) and vacuum (-) ports should be connected to the installed pipes
using short lengths of tubing.
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
symmetrical overpressure /
vacuum
+ input port
200 Pa

Instruction manual PS11/PK11
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3.2 Supply voltage connections in the instrument:
The supply voltage should be connected at the terminals (1...2). The pressure
transducer is protected against reverse polarity of the supply voltage.
The output signal is available on the signal terminal (3…5) as shown below. The
output voltage is protected against short circuits for a short period.
The optional floating relay output is available on terminal (6...8).
Observe the required supply voltage (see rating plate).
4 Calibration of the output signals
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 instruments are calibrated by the manufacturer before delivery. During assembly
it should only be necessary to correct any positional errors.
However, the following tools are required if calibration is still necessary:
power adapter with 24 V DC
instrument for measuring voltage and current
calibration device with pressure sensor (e.g. halstrup-walcher KAL 84)
the accuracy should be four times greater than that of the instrument being
calibrated
During calibration the instrument should be in the position in which it is later mounted.
Unscrew the locking saddles to the left and right of the ports using a small
screwdriver. You can now remove the front cover.
Now pull out the PCB assembly far enough that you can set the potentiometer.
Connect the (+) supply voltage to terminal 1 and the (-) supply voltage to terminal 2.
Connect the instrument for measuring voltage with PLUS to terminal 4, the instrument
for measuring current with PLUS to terminal 5 and both instruments with MINUS
(GND) to terminal 3.
cover seal, access
to switching
output potentiometer
only PK11

Instruction manual PS11/PK11
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The zero point can be calibrated after the pressure transducer has warmed up. The
voltage should be set to 0V with open ports using P1, then the current should be set
to 4mA using P4.
At the pressure input for the sensor (+) provide the correct nominal pressure (100%
measurement range), and calibrate the output of the instrument to 10V using the P2
potentiometer. Parallel to this operation, set the current to 20mA using P3.
Repeat both these setting operations, if necessary.
5 Adjusting the switching threshold
The floating contact point functions as a changeover contact, i.e. it can be used as an
NO contact or an NC contact. The following describes how to set the contact point with
the NO contact function. The same instructions apply to setting the NC contact
function, only the function is inverted.
You can access the P6 potentiometer through a bore in the front of the instrument. If
the ports use elbow connectors, you may have to twist them out of the way.
Set the switching point as follows:
Connect a continuity tester to terminals 6 and 8.
Provide the correct supply voltage.
Provide the correct pressure at which the relay should shut off.
Now turn P6 until the continuity tester hums.
If the continuity tester is humming before you set the contact, turn P6 in the
opposite direction until it stops humming.
Now change the pressure in order to test whether the switching point has been set
correctly (correct if necessary).
P1: zero point (0 V)
P2: final value U (10 V)
P3: final value I (20 mA)
P4: zero point I (4 mA)
P5: Offset negative pressure
P6: Contact point relay
only PK11

Instruction manual PS11/PK11
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6 Troubleshooting
Error description
Potential cause
Corrective action
no output signal
• supply voltage is not connected
• incorrect supply voltage
• defective reverse polarity
protection diode
• defective input protection diode
• connect correct supply voltage
• connect the correct supply
voltage (see rating plate).
• send the instrument to the
manufacturer for repair
• send the instrument to the
manufacturer for repair
output signal is constant,
despite change in
pressure
• defective output protection diode
• pressure ports reversed
• send the instrument to the
manufacturer for repair
• connect the pressure as
described in Section 3.1
output signal incorrect
• defective output protection diode
• defective pressure measurement
cell
• send the instrument to the
manufacturer for repair
• send the instrument to the
manufacturer for repair
zero point cannot be
adjusted using P1
• defective pressure measurement
cell
• send the instrument to the
manufacturer for repair
7 Technical data
Measurement data
measurement ranges
±300 Pa to 200 kPa
overload capacity
10 x the final value of the measurement range
(for measurement ranges 20 kPa)
20 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)
2 %
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)
dead volume
approx. 2000 mm3(for measurement ranges 250 Pa)
control volume
max. 200mm³
max. system pressure
100 kPa
Ambient conditions
medium
air, all non-aggressive gases
nominal temperature
+10° C to +50° C
operating temperature
0° C to +70° C
storage temperature
-10° C to +70° C
relative humidity
0…80 %
EMC standards
corresponds to EN 50 081 part 1 and EN 50 082 part 1
conformity
declaration of conformity available upon request

Instruction manual PS11/PK11
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Electrical data
power consumption
max. 1.4 W
supply voltage
24 VDC +20% / -15%
(smoothed, permissible peak-to-valley ratio = 1000
mV)
load resistance RL
RL2 kat output voltage 0...10 V
effect of change from the minimal resistance
to ∞: max. 0.2 %
working resistance RB
RB=500 
effect of change from 500 Ω to 0 Ω: max. 0.2%
output signal
0 to 10 V and 4 to 20 mA
(voltage limited to 10 V)
contact points
single-pole switching relay
max. load capability 230 VAC, 5 A
can be adjusted over the complete measurement range
using the potentiometer
Physical data
pressure port
FESTO elbow (AN) quick connector for PVC tubing
(external Ø 6mm)
electrical connection
screw terminals for cables up to 2.5 mm2
mounting orientation
mounted vertically on 35mm DIN top hat rails
dimensions (w x l x h)
45 x 111 x 73 mm
protection class
IP40
weight
0.25 kg
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

Instruction manual PS11/PK11
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8 Dimension drawings
111
45
-
U OUT
20
I OUT
19.5
+
-
+ UB GND GND
-
73
25
31 für Potentiometer
Verschlußstopfen
(nur PK11)
(für Schlauch außen-Ø6)
2x L-Steckverschraubung
31
25
73
45 111
Verschlußstopfen
20
0-10V Masse 24VDC
19.5
(für Schlauch außen-Ø6)
2x L-Steckverschraubung
7100 003754B_PS11_PK11_eng.doc 02.11.2021 Ze
cover seal
FESTO elbow
(AN) quick
connector for PVC
tubing (external Ø
6mm)