halstrup-walcher EMA 200 User guide

Document 7100.004074
Original Instruction Manual
EMA 200 Digital Pressure Gauge
halstrup-walcher GmbH
Stegener Straße 10
D-79199 Kirchzarten
Germany
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.halstrup-walcher.de/en/

EMA 200 Instruction Manual
2
Revision Overview
Version:
Date:
Author:
Amendments:
A
07/2010
Sie
Initial Revision
B
03/2017
Me
Additions
C
05/2017
Me
Chapter 7.4 Density of the medium
D
05/2018
Me
Analog output
E
03/2021
Me
Layout; Certificate of conformity;
F
01/2022
Me
Chapter 4.3 Switchover pressure range
G
09/2022
RH
Additions for configuration Density / Pitot factor
H
12/2022
Me
Revision overview; Update technical data, QR-Code
© 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.

EMA 200 Instruction Manual
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Purpose of instruction manual
This instruction manual describes the features of the EMA 200 digital pressure
gauge 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.
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.

EMA 200 Instruction Manual
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Table of Contents
1Safety precautions ....................................................................................................5
1.1 Appropriate use...........................................................................................................5
1.2 Troubleshooting, maintenance, repairs, disposal.........................................................5
1.3 Symbols ......................................................................................................................6
2Instrument description..............................................................................................7
2.1 Functions.....................................................................................................................7
2.2 Instrument controls......................................................................................................7
3Start-up ......................................................................................................................8
3.1 Electrical connections..................................................................................................8
3.2 Pneumatic connections ...............................................................................................8
4Operating the instrument..........................................................................................9
4.1 Switching the instrument on/off....................................................................................9
4.2 Display modes: measurement, hold, max., min. ..........................................................9
4.3 Changing pressure units..............................................................................................9
4.4 Zeroing key ...............................................................................................................10
4.5 Analogue output........................................................................................................10
5Configuration...........................................................................................................11
5.1 Setting units of pressure............................................................................................11
5.2 Temperature display..................................................................................................11
5.3 Flow-rate display (not available with 200kPa Range).................................................11
5.4 Media density (not available with 200kPa Range) .....................................................12
5.5 Pitot factor(not available with 200kPa Range) ...........................................................12
5.6 Setting the scale for the analogue output...................................................................13
5.7 Analog offset for +/- measurement.............................................................................13
5.8 Attenuation................................................................................................................13
5.9 Auto On/Off ...............................................................................................................14
5.10 Default settings..........................................................................................................14
6Troubleshooting......................................................................................................15
7Technical data .........................................................................................................16
8Certificate of Conformity.........................................................................................18

EMA 200 Instruction Manual
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1 Safety precautions
1.1 Appropriate use
The EMA 200 is a portable, battery-powered digital pressure gauge for measuring
positive and negative differential pressures. At the heart of this precision instrument is
a pressure measurement capsule containing a membrane spring; the deflection of
this spring is then ascertained via an inductive measurement principle. Because it is
durable and easy-to-use, the EMA 200 lends itself well to maintenance work and
customer servicing for heating, air-conditioning and ventilation units, where it can be
used for monitoring filters, measuring fireplace drafts and wind pressure, etc.Its
precision and reproducibility also make the EMA 200 is highly suitable for use in
laboratory applications.
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 Troubleshooting, maintenance, repairs, disposal
The individual responsible for the electrical connections must be notified immediately
if the instrument is damaged or if errors occur.
This individual must take the instrument out of service until the error has been
corrected and ensure that it cannot be used unintentionally.
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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1.3 Symbols
The symbols below in these operating instructions point to the risks, which could arise
in handling the equipment:
WARNING!
It points to a hazard possibly extending from
injures through to death should the instructions
not be followed.
CAUTION!
It points to a hazard which could cause
considerable damage should the instructions not
be followed.
INFORMATION!
This indicates information, which is vital for
proper appliance operations

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2 Instrument description
2.1 Functions
The EMA 200 is a battery-operated, digital pressure gauge for measuring
overpressure, vacuum and differential pressure of non-aggressive gases. Operating
range is 200 Pa to 200 kPa.
Because it is robust, easy-to-use and includes an analogue output, this instrument is
especially suitable for maintenance, customer service and record-keeping for heating,
ventilation and air-conditioning units.
At its heart 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. Measurement range is between 200 Pa and 20 kPa. A
distance measurement system converts this displacement into an electrical signal.
A semiconductor sensor is used for measuring pressures in the area of 200 kPa.
2.2 Instrument controls
The instrument control panel consists of a keypad with four keys.
pressure display
flow-rate / temperature display
on/off
select key: pressure, min., max., hold
select key: pressure units
zero-point calibration / configuration

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3 Start-up
3.1 Electrical connections
Use only IEC 6 LR 61 batteries.
Open the battery compartment on the rear of the instrument by sliding off the
compartment cover. Plug the batteries in to the battery hook-up, making sure that the
battery terminals are properly aligned. Place the battery in the compartment and
replace the cover.
3.2 Pneumatic connections
Connect the EMA 200 to the pressure source at the overpressure port (+) when
measuring overpressure, at the vacuum port (-) for measuring vacuum pressure, or at
both ports (making certain to connect the + and - ports appropriately) for measuring
differential pressure.

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4 Operating the instrument
The following sections explain how to operate the instrument correctly.
4.1 Switching the instrument on/off
Turn the instrument on or off by briefly depressing the key. The instrument
displays its measurement range in mbar for roughly 1 s immediately after it is
switched on.
4.2 Display modes: measurement, hold, max., min.
The key allows the user to toggle between the various display modes. Pressing
this key once will call up a different display mode. In hold, max and min modes, users
can begin a new measurement by briefly depressing the zeroing key. In the
display modes min and max, this will reset the display value, because the actual
value will be the new min or max value.
Display mode
Min
arrow
Max
arrow
Display
normal
measurement
off
off
instrument displays current pressure
value
hold
on
on
instrument displays pressure value
prior to switching modes
max
off
on
instrument displays the largest
measured pressure
min
on
off
instrument displays the smallest
measured pressure
4.3 Changing pressure units
The instrument allows the user to toggle between a number of different units of
pressure. Users can change pressure units during normal operation by
depressing the key. The following table lists the units that are available, whereby
the units Pa and kPa depend on the measuring range of the unit in use:
The instrument will use the new units until it is switched on/off or until the next time
the units are changed. The units selected during configuration (see section 5) are
always set when the instrument is switched on.
Pressure units
Factor for
converting to
Pa
Flow rate
in
Available at
1 kPa =
1000
m/s
Measuring range 2, 20
and 200 kPa
1 Pa =
1
m/s
Measuring range 200 Pa
1 mbar(hPa) =
100
m/s
All measuring ranges
1 mmH2O =
9,80665
m/s
All measuring ranges
1 inH2O =
249,08891
fpm x 100
All measuring ranges

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4.4 Zeroing key
The effects of temperature and positioning of the measurement capsule may cause
the zero-point to shift, thereby distorting the measurement result, i.e., causing the
instrument to display a measured value even when it is not connected to a source of
pressure. Users can recalibrate the zero point by briefly pressing the key.
It is important that no external pressure is applied to the measuring device at the time
of zeroing.
4.5 Analogue output
The EMA 200 has a 0...2V analogue output, allowing it to read out an output voltage
proportional to the pressure. When configuring the instrument, users may set the
pressure at which the instrument will read out an output voltage of 2.0V. The output
voltage is read out of the instrument via a 3.5 mm jack.
For electrical connection, see following assignment:
shield –GND
analogue output
GND

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5 Configuration
By adjusting the configuration settings, users can adapt the instrument to their
specific application. This menu can be activated by depressing the zero-point
key until 'ConF' appears in the top line of the display. After the operator
releases this key, the instrument launches the first item (setting units of pressure). To
exit the configuration menu, simply press the zero-point key again until 'MEAS'
appears in the top line of the display. The new settings are now saved and can be
used each time the instrument is switched on.
5.1 Setting units of pressure
The symbol '[P]' will appear in the bottom line of the display and one of the pressure
units will either be displayed or indicated as active by means of an arrow.
Users may now set the desired units by pressing the and keys. Briefly
depressing the key will exit this mode and the instrument will continue on to the
next configuration parameter.
5.2 Temperature display
The symbol '°C' is shown in the bottom line of the display and the current status of
this switch (on or off) is shown in the top line. Users may change the
status by depressing the and keys, and may finish entering
the settings by pressing the key. The temperature display will automatically
switch off if, during the subsequent step, the flow rate display is activated.
(The instrument can only display temperature or flow rate, but not both at the same
time.)
5.3 Flow-rate display (not available with 200kPa Range)
'SPd' (SPeed) will now appear in the bottom line of the display to indicate the function
that controls the flow-rate display. The current status of this switch (on
or off), shown in the top line, may be altered by pressing the and keys.
Briefly depressing the key will exit this mode.
If the flow-rate display has been activated, the menu for setting the
density of the medium to be measured appears; if not, the next step is
to set the scale for the analogue output (section 5.6).

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5.4 Media density (not available with 200kPa Range)
This configuration parameter is located in the bottom line of the display by the symbol
'ro'. The top line displays the density as it is currently set in g / m3. The instrument
waits for the user to enter the density of the medium to be measured. You can set
values between 0001 and 9999.
The default setting is 1199 g / m3.
The keypad buttons perform the following functions:
Selects which digit of the display is to be changed (digit will flash).
This key increases the selected digit by +1 (0...90). There is no overflow
to the next higher digit. If the set value exceeds the limits of the setting
range, the digit jumps to 0.
Exits the density entry mode and continues on to the pitot factor.
5.5 Pitot factor (not available with 200kPa Range)
This step, represented by the 'Pit' symbol in the bottom line of the display, allows the
user to enter the factor for a pitot tube.
The default setting is 1,000 for standard pitot tubes.
You can set values between 0,001 and 9,999.
The keypad buttons perform the following functions:
Selects which digit of the display is to be changed (digit will flash).
This key increases the selected digit by +1 (0...90). There is no overflow
to the next higher digit. If the set value exceeds the limits of the setting
range, the digit jumps to 0.
Exits the entry mode for the pitot factor and continues on to the next step:
setting the scale of the analogue interface.

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5.6 Setting the scale for the analogue output
This configuration parameter is used for setting the pressure at which the analogue
output reads out 2V. Users have the option here of setting the analogue output to any
desired final pressure between 20 and 100% of the measurement range. While
operators may enter final pressures <20%, doing so will decrease the DA resolution.
The bottom line of the display will show the code 'AnH.'
Selects which digit of the display is to be changed (digit will flash).
This key increases the selected digit by +1 (0...90). There is no overflow
to the next higher digit. If the set value exceeds the limits of the setting
range, the digit jumps to 0.
Exits this mode and continues on to the next step: setting the analog output.
5.7 Analog offset for +/- measurement
With this menu item you can increase the analogue output voltage by 1.0 V. The
amplification of the analogue output is halved. This makes it possible to map negative
differential pressures to the analogue output.
The status of this switch is indicated in the upper line with 'On' or 'OFF' and can be
changed using the and keys. The display shows 'AOF' as the identifier in the
bottom line. Press the key to exit this menu item.
The unit now outputs 2.0 V if the pressure = AnH. 0.0 V are displayed if the pressure
corresponds to the value of -AnH.
5.8 Attenuation
It may be desirable to determine and display an average value over a specific period
if input pressures fluctuate significantly. This parameter allows the user to set the
number of measured values to be used to determine an average. Assuming a display
rate of 2 measurements per second, this value (1...20) sets an attenuation time
between 1 and 10 seconds. The bottom line of the display will show the code 'dAn.'
Selects which digit of the display is to be changed (digit will flash).
This key increases the selected digit by +1 (0...90). There is no overflow
to the next higher digit. If the set value exceeds the limits of the setting
range, the digit jumps to 0.
Exits this mode and continues on to the next step: activating the auto on/off
function.

EMA 200 Instruction Manual
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5.9 Auto On/Off
The EMA 200 has an auto on/off function that can be used to avoid consuming
battery power unnecessarily. This feature (which can be toggled on and off) will
power down the instrument after 20 minutes if the pressure does not change during
this time and no keys are pressed. The wait period is reset to 20 min. every time the
user depresses a key or the pressure fluctuates. The bottom line of the display will
show the code 'Aut.'
Turns this function on or off.
Turns this function on or off.
Exits this mode and continues on to the next step: returning settings to
default values.
5.10 Default settings
This parameter is used to reset the instrument to its default settings if desired. The
bottom line of the display will show the code 'rES.'
Turns this function on (yes) or off (no).
Turns this function on (yes) or off (no).
Exits this mode and returns to measurement mode.

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6 Troubleshooting
Error description
Potential cause
Corrective action
battery symbol active
weak battery
install new battery
battery symbol is blinking
battery nearly empty
the battery should be replaced
display shows ‘batt Lo’ and
switches off
dead battery
install new battery
use a 9V IEC 6 LR 61 battery
zero-point calibration cannot
be performed
defective pressure
measurement capsule
send the instrument to the
manufacturer to repair

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7 Technical data
margin of error
0.5% of final full-scale (FS) at 22°C 2°C
temperature coefficient
span
0.04% / °C of FS
temperature coefficient
offset
0.04% / °C of FS (for gradual changes in temperature)
long-term amplitude drift
0.5% / year
overload capacity
10 x FS (for ranges 20 kPa)
2 x FS (for ranges > 20 kPa)
1,2 x FS ( 200kPa measurement range)
response time
0.5 seconds
display
4-place LCD for pressure
resolution: 0.005% of FS for 0<P<0.5
0.05% for P > 0.5 FS
0.005% 0>P>-0.1 FS
0.05% -0.1% FS > P > -FS
3-place LCD for flow rate
temperature display
Resolution: 1°C
accuracy: 1 °C
measurement range: 0 ... 60°C
analogue output
max. output voltage: 3.3 V
permissible load: ≥2 KΩ
temperature range
storage temperature -10 ... +70°C
operating temperature range 0 ... 50°C
supply voltage
9V IEC 6 LR 61 monoblock battery (alkaline-Mn
battery life, in operation: approx. 100 h
battery life, in standby mode: approx. 2000 h
pressure port
universal tubing ports
4...6 mm inner diameter
operating position
preferably horizontal; positioning error may be corrected
using the "zero-point calibration" key
weight
approx. 400 g, including battery
Certification
CE / UKCA (upon request)
miscellaneous
The automatic off function switches the instrument off after
it has been "quiet" for approx. 20 minutes. This "quiet time"
is interrupted whenever the pressure changes by more
than 2% of the final value or the operator presses a key.
Each time this happens, the wait period is reset to 20
minutes.

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Appendix A:
Parts in contact with measurement medium
Beryllium bronze CuBe2
Araldite CY236 / HY988
Mu metal (nickel alloy)
Loctite 242e
Brass CuZn39Pb3
Ferrit
Aluminium AlCuMgPb / AlMg3
KEL (FPM: fluorinated rubber)
Viton(tubing)
Vepuran Vu 4457/51
Crastin (PTBP)
UHU-Plus endfest 300 binder
For more information on our measurement technology products, please visit our
homepage at
www.halstrup-walcher.de/en/products/measurement-technology/

EMA 200 Instruction Manual
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8 Certificate of Conformity
7100.004074G_EMA200.docx 12/2022 Si/Me/Ka

EMA 200 Instruction Manual
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Notes: