halstrup-walcher PU User guide

Original Instruction Manual
for PU/PI
Differential Pressure Transmitters
halstrup-walcher GmbH
Stegener Straße 10
D-79199 Kirchzarten
Germany
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
Internet: www.halstrup-walcher.com
Document 7100.001784

PU/PI Instruction Manual
2
Revision Overview
Version:
Date:
Author:
Amendments:
A
2005
Ka
Initial Revision
B
11/2020
Me
Technical data; cable ties; fuse; technical drawing
C
12/2022
Me
Revision overview; Update technical data, QR-Code
D
12/2022
Me
EOL of variant PS10
© 2022
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 them. It must not be
copied either wholly or in part or made available to third parties.
The instruction manual is part of the product. Please read this manual carefully, follow our
instructions, and pay special attention to the safety information provided. This instruction
manual should be available at all times. Please contact the manufacturer if you do not
understand any part of the instructions.
The manufacturer reserves the right to continue developing this device model without
documenting such development in each individual case. The manufacturer will be happy to
determine whether this manual is up-to-date.

PU/PI Instruction Manual
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Purpose of instruction manual
This instruction manual describes the features of the PU/PI differential pressure
transmitter and provides guidelines for their 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.
Conformity
This pressure transmitter conforms with the present stage reached in technical
engineering.
It complies with the statutory requirements of the EC and UK-directives.
This is documented by the CE and the UKCA mark being affixed

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Table of Contents
1 Safety precautions...........................................................................................................5
1.1 Appropriate use.............................................................................................................5
1.2 Shipping, assembly, electrical connections and start-up................................................5
1.3 Troubleshooting, maintenance, repairs, disposal...........................................................5
1.4 Symbols........................................................................................................................6
2 Instrument description......................................................................................................7
3 Start-up ............................................................................................................................7
3.1 Features........................................................................................................................7
3.2 Supply voltage connections in the instrument................................................................8
3.3 Analog output connections in the instrument.................................................................8
4 Calibrating the zero point..................................................................................................9
5 Troubleshooting..............................................................................................................10
6 Technical data................................................................................................................11
7 Dimension drawings.......................................................................................................13
8 Certificate of conformity..................................................................................................14

PU/PI Instruction Manual
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1Safety precautions
1.1 Appropriate use
In addition to differential pressure data, the PU/PI differential pressure transmitters
also record 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 inputs 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.
The electronic components of the instrument contain 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.

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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.

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2 Instrument description
The PU/PI pressure transmitters are pneumatic, electronic sensors for measuring
overpressures, vacuum pressures and differential pressures. Typical applications
include, for instance, pressure measurements in air-conditioning and ventilation ducts.
At the heart of the transmitter 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 transmitters
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 PU/PI pressure transmitters are highly robust, they are nevertheless
precision instruments and should be handled with care. Avoid mounting the
instruments in the direct vicinity of any sources of radiation or heat, such as heaters,
as this could result in measurement errors. Ideally, the instrument should be mounted
vertically on a wall not subject to vibration. Pressure (+) and vacuum (-) ports should
be pointing down in order to prevent any condensation from entering the
measurement cell.
When connecting pressure to the transmitter, use the following table to ensure that
the sign of the pressure (+ or -) is correct.
Type of pressure
Connect pressure to
Example
overpressure
+ input port
0...1 kPa
vacuum
- input port
0...- 500 Pa
differential pressure
higher pressure at + port
lower pressure at - port
0…125 Pa, e.g. via a differential
pressure transmitter (such as a
measuring orifice)
symmetrical pressure ranges
+ input port
200 Pa
asymmetrical pressure
ranges
input port corresponding to
the high end of the pressure
range
-300 Pa...+ 1 kPa
(pressure should be connected to
the + input port)

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3.2 Supply voltage connections in the instrument
Figure 1: Configuration of circuit board: (not all components are shown)
P0
The devices with DC voltage supply are protected against reverse polarity of the supply
voltage.
Observe the required supply voltage (see rating plate) as well as the connection
diagram located on the housing cover / circuit board mount.
Secure the connecting cables as shown in the picture with the cable ties
provided.
3.3 Analog output connections in the instrument
The transmitter outputs are protected from short circuits.
The output signal can (with correspondingly applied pressure) exceed or fall below
the specified limits (except 0 mA).
Terminal
Supply voltage
11
13
24/115/230 V~ 50/60 Hz
24/115/230 V~ 50/60 Hz
11
13
+20.5 V...28.5 VDC
ground (GND)
Terminal
Output signal
1
2
ground (GND)
0...10 V / 0/4...20 mA
5 V / 10 V

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Display-connector
4 Calibrating the zero point
Please remember that it takes roughly 30 to 60 minutes for the pressure
transmitter 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 wiring of the current outputmakes it impossible to enter a negative current.
As a result, operators cannot turn the zero-point potentiometer beyond the
0.0 mA mark when calibrating the zero point. Were this not the case, the
negative component, which cannot be displayed, would interfere with the
output signal.
After the pressure transmitter has warmed up, the operator may calibrate the zero
point using the P0 trimmer (see figure 1). The following table may be used to look up
the value to which the analog output must be set when the ports are open; this value
is dependent upon both the measurement range and the output signal.
Output signal
Measurement range
0...10 V
0...20 mA
4...20 mA
± 5 V
± 10 V
0...nominal pressure
0.00 V
0.00 mA
4.00 mA
- 5.00 V
- 10.00 V
± nominal pressure
5.00 V
10.00 mA
12.00 mA
0.00 V
0.00 V
asymmetrical measurement
range
the output signal corresponding to the average of both
measurement range limiting values

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5 Troubleshooting
Error Description
Potential Cause
Corrective Action
no output signal
supply voltage is not
connected
incorrect supply voltage
defective fuse
defective input protection diode
only for DC power:
defective reverse polarity
protection diode
connect correct supply voltage
connect the correct supply voltage
(see rating plate).
replace the SI1 fuse
(see technical data)
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 pressure as outlined in
section 3. “Start-up”
output signal incorrect
(only for 0...20 mA)
defective output protection
diode
defective pressure
measurement cell
for current output:
• output loadtoo high
for voltage output:
• load resistance too low
current output calibrated
incorrectly
Send the instrument to the
manufacturer for repair
Send the instrument to the
manufacturer for repair
observe maximum output load of 500
observe minimum load resistance
(either 2 k, 5 kor 10 k, depending
on output; see section 6 “Technical
data”
follow instructions on calibrating the
zero point at a current output of
0…20mA
zero point cannot be
adjusted using P0
defective pressure measurement
cell
Send the instrument to the
manufacturer for repair

PU/PI Instruction Manual
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6 Technical data
Measurement data
measurement ranges
(also ± measurement ranges)
50 / 100 / 250 / 500 Pa
1 / 2,5 / 5 / 10 / 20 / 50 / 100 kPa
(others available upon request)
overload capacity
10 x for measurement ranges 20 kPa
2 x for measurement ranges > 20 kPa
hysteresis
0.1 %
warm-up period
approx. 30 min.
step response time (T63)
(time constant)
approx. 20 ms (up to 5 s available upon request)
measurement accuracy
(measurement accuracy of the reference
0.3Pa)
1 % FS
0.5 % FS only for meas. ranges ≥250 Pa (optional)
0.2 % FS only for meas. ranges ≥250 Pa (optional)
temperature coefficient span
0.04%/ K (10°C...+60 °C)
temperature coefficient zero point
0.04%/ K (10°C...+60 °C)
dead volume
approx. 2000 mm3(for measurement ranges 250 Pa)
approx. 9000 mm3(for measurement ranges 250 Pa)
control volume
max. 200mm³
max. system pressure
100 kPa
Ambient conditions
medium
air, all non-aggressive gases
rated temperature range
+10° C to +60° C
storage temperature
-10° C to +70° C
relative humidity
0…80 %
conformity
CE / UKCA (upon request)

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Electrical data
power consumption
max. 1.2 W
supply voltage
24 VDC +20% / -15% (filtered, permissible peak-to-valley ratio = 1000 mV)
230VAC 10 %, 50/60 Hz
115VAC 10 %, 50/60 Hz
24VAC 10 %, 50/60 Hz
fuse
200 mAT (for ex. Wickmann Typ TR5)
minimum load resistance RL
RL2 kfor an output voltage of 0...10 V
RL5 kfor an output voltage of 5 V
RL10 kfor an output voltage of 10 V
for models PU with output voltage
maximum effect of load resistance = 0.3%
maximum output load RB
RB=500 
for models PI with current output
output load dependence: < 0.3 %
display
3½ or 4½-place LCD, character height = 13 mm
(optional)
output signal
0 to 10 V, 0 to 20 mA or 4 to 20 mA; ±5 V and ±10 V are
also possible
Physical data
pressure port
Ø 6.5 mm for NW6 tubing
(interior tubing diameter = 5 mm)
electrical connections
screw terminals for cables up to 2.5 mm2
mounting orientation
vertical
(when placing your order, please indicate if a horizontal
orientation is required)
dimensions (w x h x d)
80 x 120 x 73 mm
120 x 122 x 75 mm (for LCD option)
protection class
IP65
weight
between 300 g and 700 g, depending on design
options
3½-place LCD
4½-place LCD
factory calibration
Calibration according to DKD-R 6-1
cable gland: PG9 or PG11 threaded connections
output signal attenuation up to 5 s
silicon-free materials for parts in contact with medium
Appendix A: Parts in contact with measurement medium
Beryllium bronze CuBe2 Araldite CY236 / HY988
Mu metal (nickel alloy) Loctite 242e
Brass CuZn39Pb3 Carbonyl iron
Aluminum AlCuMgPb / AlMg3 KEL (FPM: fluorinated rubber)
Silicon (tubing) optional: Viton Vepuran Vu 4457/51
Crastin (PTBP) UHU-Plus endfest 300 binder

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7 Dimension drawings
For more information on our measurement technology products, please visit our
homepage at
www.halstrup-walcher.de/en/products/measurement-technology/

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8 Certificate of conformity
7100.001784D_PUPI.docx 12/2022 Me

PU/PI Instruction Manual
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Notes: