PCE Instruments PCE-WMM 50 User manual

Manual
Version 1.0
Date of creation: 31.05.2016
Date of last change: 28.11.2017
CO2 Analyser PCE-WMM 50
PCE Americas Inc.
711 Commerce Way
Suite 8
Jupiter
FL-33458
USA
From outside US: +1
Tel: [phone]
Fax: [phone]
[email protected]
www.pce-instruments.com/english
www.pce-instruments.com
PCE Instruments UK Ltd.
Units 12/13
Southpoint Business Park
Ensign way
Hampshire / Southampton
United Kingdom, SO31 4RF
From outside UK: +44
Tel: [phone]
Fax: [phone]
[email protected]

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Contents
1Safety notes ............................................................................................................. 3
2Specifications .......................................................................................................... 4
2.1 Technical specifications.............................................................................................................. 4
2.2 Delivery content.......................................................................................................................... 5
3System description ................................................................................................. 6
3.1 Device......................................................................................................................................... 6
3.2 Display........................................................................................................................................ 9
4Getting started ....................................................................................................... 10
4.1 Preparation............................................................................................................................... 10
4.2 Power connection..................................................................................................................... 11
5Operation ............................................................................................................... 12
5.1 Further measuring functions..................................................................................................... 12
5.2 Settings..................................................................................................................................... 13
6Maintenance .......................................................................................................... 14
6.1 Repair, cleaning and maintenance........................................................................................... 14
6.2 Troubleshooting........................................................................................................................ 16
7Warranty ................................................................................................................. 16
8Disposal ................................................................................................................. 17
9Contact ................................................................................................................... 17
9.1 PCE Instruments UK ................................................................................................................ 17
9.2 PCE Americas .......................................................................................................................... 17

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Thank you for purchasing a gas detector from PCE Instruments.
1 Safety notes
Please read this manual carefully and completely before you use the device for the first time. The device
may only be used by qualified personnel and repaired by PCE Instruments personnel. PCE Instruments
cannot be held liable for any damage or injuries caused by non-observance of the manual.
The device must only be used as described in this instruction manual. If used otherwise, this can
cause dangerous situations for the user and damage to the meter.
The instrument may only be used if the environmental conditions (temperature, relative humidity,
…) are within the ranges stated in the technical specifications. Do not expose the device to
extreme temperatures, direct sunlight, extreme humidity or moisture.
When the air quality meter is exposed to extreme heat, fire and explosions as well as
deformations of the device are very likely.
Do not expose the CO2 analyser to any impact, shocks or vibration.
The case should only be opened by qualified PCE Instruments personnel. Touching the electrical
conductor inside the instrument can cause electric shocks.
Never use the meter when your hands are wet.
You must not make any technical changes to the device.
The appliance should only be cleaned with a damp cloth. Use only pH-neutral cleaner, no
abrasives or solvents.
The device must only be used with accessories from PCE Instruments or equivalent. Using the
wrong mains adaptor can cause damage to the device as well as fatal injuries of the user.
The mains adaptor should be fixed tightly with the elastic plug lock, so that it can only be
removed using mechanical tools.
If you wish to connect a fan to the potential-free contacts of the sensor unit, make sure that the
fan has its own external power supply. Otherwise, the fan will not work. This can cause
dangerously high CO2concentrations in the monitored area.
Before each use, inspect the case for visible damage. If any damage is visible, do not use the
device.
Do not use the instrument in explosive atmospheres.
Pay special attention to the “ESC” indication in the display. If it appears, adopt protective
measures before entering the room where the sensor unit has been installed.
Check the cable connection between the sensor unit and the remote display unit thoroughly. The
cable is connected to the remote display unit’s input, coming from the sensor unit.
Communication between the sensor unit and the remote display unit should work flawlessly.
Therefore, you should use the “DIAG” function to test flawless communication.
The limit values for the measuring variables as stated in the specifications must under no
circumstances be exceeded.
Non-observance of the safety notes can lead to damage of the device or injuries of the user.
Moreover, observe the applicable national health and safety regulations and those set up by the
relevant trade associations in your country, as well as any relevant regulations for safe and
professional operation. Particularly, make sure to comply with your national accident prevention
regulations for the handling of gases.
This instruction manual is published by PCE Instruments without any guarantee.
We expressly point to our general guarantee terms which can be found in our general terms of business.
If you have any questions please contact PCE Instruments.

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Safety symbols
Safety-related instructions the non-observance of which can cause damage to the device or personal
injury carry a safety symbol.
Symbol
Designation / description
General safety symbol
Non-observance can cause personal injury and/or damage to the device.
Warning of electric voltage
Non-observance can cause electric shocks.
2 Specifications
2.1 Technical specifications
Sensor unit
Measured gas
carbon dioxide (CO2): 0 ... 50,000 ppm (5 %) (vol.) NDIR sensor
Temperature (gas /
environment)
0 ... +45 °C
Supply of gas samples
by diffusion
Alarm contacts
- 1 potential-free normally open contactor to control external devices
by releasing alarm 1
- switching power: 30 V DC / 250 V AC, max. 2 A
Alarm thresholds
Alarm 1
0.5 / 1 / 1.5 / 2 %
Alarm 2
1.5 / 2 / 2.5 / 3 / 3.5 / 4 %
Menu items
Function test of connection between sensor unit and remote display
unit, calibration, switching between °C and °F, alarms 1, 2 and factory
default settings
Display elements
- 4-digit digital display for measured gas concentration within range
0 ... 9999 ppm
- 3-digit digital display for measured gas concentration within range
1 ... 5 %
- additional 3-digit digital display for measurement and temperature in
°C and °F
- LEDs for operation, alarms 1, 2 and monitoring of voltage supply
Operating elements
Reset, menu selection, Enter
Safety
continuous self-surveillance of temperature range, sensor life,
implausible values, EEPROM system, internal data transfer
Enclosure
plastic, IP 54, splash-water proof
Voltage Supply
Mains adaptor 100 ... 240 V AC, 50 / 60 Hz
Diameters
168 x 125 x 47 mm (without connections)

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Remote display unit
Temperature (gas /
environment)
0 ... +45 °C
Menu items
- 4-digit digital display for gas concentration within range
0 ... 9999 ppm
- 3-digit digital display for concentration within range 1 ... 5 %
- additional digital display to measure temperature in °C and °F
- LEDs for operation, alarms 1, 2 and monitoring of voltage supply
Display elements
Function test, Reset, menu selection, Enter, shifting between °C
and °F
Enclosure
aluminium, IP 54, splash-water proof
Voltage supply
via data cable to gas detector
Dimensions
118 x 85 x 34 mm (without connections)
2.2 Delivery content
1 x gas detector PCE-WMM 50
1 x instruction manual

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3 System description
3.1 Device
The gas detector PCE-WMM 50 is equipped with a buzzer as well as a visual indication. These are
activated when the CO2 concentration reaches or exceeds a threshold previously set. Also, high CO2
concentrations activate a potential-free contact which can, for instance, activate a fan which reduces the
increased CO2 concentration in the room concerned.
Sensor unit
A LC display
B Yellow LED (error indication)
C Red LED 2 (AL2)
D Red LED 1 (AL1)
E Green LED (power supply)
F Reset key
G Mode key
H Enter key
I Communication cable to remote display
J Potential-free contact:
Red cable
White cable
Blue cable (central contact of the relay)
K Power supply
L Rubber protective cap
M Gas input
N Buzzer

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The sensor unit must be installed in the room to be inspected, such as a room where CO2gas bottles are
stored. The LC display shows the CO2 concentration in the ambient air as well as the temperature. When
the green LED glows constantly, the power supply of the device is granted.
If “ESC” is indicated in the LC display of the remote display unit, you must adopt protective
measures before entering the room where the sensor unit has been installed. Check the room’s
ventilation and find out whether there is a CO2 leak, wearing protective clothing / equipment. As soon as
the CO2 concentration in the ambient air has reached the second alarm threshold, “ESC” appears in the
display of the sensor unit as well as in the display of the remote display unit. The yellow LED “FLT”
(standing for fault) flashes. Use the „ReFactSet“ function to reset the gas leak detector to factory defaults.
The “ESC” indication should now disappear. Alternatively, you can remove the mains adaptor and plug it
back into the socket.
The sensor unit has the following functions:
DIAG Communication test between sensor unit and remote display unit
CAL Calibration of gas detector
ReFactSet Reset to factory default settings
You can set two alarm thresholds:
AL1
AL2
1. Alarm threshold
Selectable threshold values: 0.5 %; 1 %; 1.5 %; 2
%
(Factory default setting: 1.5 %)
When the CO2concentration exceeds the first
threshold value, the red AL1 LED (LED 1) will flash,
the buzzer will sound and the potential-free contact
will close if the red and blue cables are connected
or closes when the white and blue cables are
connected.
The AL1 LED will stop flashing and the buzzer will
stop sounding as soon as the CO2concentration
falls below the first alarm threshold value.
2. Alarm threshold
Selectable threshold values: 1.5 %; 2 %; 2.5 %; 3
%; 3.5 %; 4 %
(Factory default setting: 3 %)
When the CO2concentration exceeds the second
threshold value, the red AL1 and AL2 LEDs will
flash at the same time, the time between the
buzzer intervals becomes shorter and „ESC“
appears in the LC display.
When the CO2concentration falls below the second
alarm threshold, even if it falls below the first alarm
threshold, the red AL1 and AL2 LEDs will keep
flashing and the buzzer will sound until you restart
the device. To restart the gas meter, press the
“Reset“ key (F) or disconnect the mains plug from
the socket and plug it back in.

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Remote display unit
O Green LED (power supply)
P Red LED 1 (AL1 )
Q Red LED 2 ( AL2)
R Yellow LED (error indication)
S LC display
T Enter key
U Mode key
V RJ45 connection (Output)
W RJ45 connection for sensor unit (Input)
X Buzzer

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3.2 Display
Symbol
Meaning
Description
CO2concentration in ppm
CO2concentration in the
monitored room
Temperature (degrees Centigrade)
Temperature in the monitored
room in degrees Centigrade
Temperature (degrees Fahrenheit)
Temperature in the monitored
room in degrees Fahrenheit
Alarm
Alarm icon
Diagnosis
Test of communication between
the sensor unit and the remote
display unit
First alarm threshold
If the CO2concentration exceeds
the first alarm threshold,
- the red LED 1 flashes,
- the buzzer sounds and
- the potential-free contact
closes if the red and blue cables
are connected or closes if the
white and blue cables are
connected
Second alarm threshold
If the CO2concentration exceeds
the second alarm threshold,
- ”ESC”appears in the LCD
- the two red LEDs 1 and 2
flash,
- the buzzer sounds
Calibration
Calibration of the CO2 sensor if
the measurement value deviates
too much from the current CO2
concentration
Restore Factory Settings
Deletes all custom settings and
restores the factory default
settings.
Escape
Appears once the second alarm
threshold is exceeded, what
might be a sign of CO2leakage.
High
The CO2concentration is higher
than 5 %.

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If “ESC” is indicated in the LC display of the remote display unit, you must adopt protective
measures before entering the room where the sensor unit has been installed. Check the room’s
ventilation and find out whether there is a CO2 leak, wearing protective clothing / equipment. As soon as
the CO2 concentration in the ambient air has reached the second alarm threshold, “ESC” appears in the
display of the sensor unit as well as in the display of the remote display unit. The yellow LED “FLT”
(standing for fault) flashes. Use the „ReFactSet“ function to reset the gas leak detector to factory defaults.
The “ESC” indication should now disappear. Alternatively, you can remove the mains adaptor and plug it
back into the socket.
The remote display unit shows the readings and safety warnings of the sensor unit. It is connected to the
sensor unit via a communication cable (cable length: max. 8 m). the remote display unit should not be
placed in the same room as the sensor unit. It should be mounted in a way which provides high visibility
and an easy reading of the CO2concentration before entering the room where the sensor unit is located.
The connection between both devices can be checked by using the “DIAG” function which is described in
the further course of this manual. To reset the PCE-WMM 50, the “Reset” key on the sensor unit is used.
4 Getting started
4.1 Preparation
When taking the PCE-WMM 50 out of its box, remove the protective rubber cap from the gas input
(M) and put it to position L. During operation, make sure that the gas input (M) is not blocked at any time.
1 power supply (ventilation)
2 fan
3 mains adaptor
4 sensor unit
5 gas bottles
6 / 7 remote display unit
8 door
Open the box and take out the sensor unit, the remote display unit and all accessory parts.
Mount the sensor unit in the area which you want to monitor. It should be placed 0.45 m above the
ground and as near as possible to the pipes and valves. Mount the wall mounting to a wall by using 4
screws. The sensor unit can be placed in the mounting afterwards. Make sure that the sensor unit sits in
the mounting tightly.
Mount the remote display unit outside of the room to be monitored. Mount the wall mounting to the wall by
using screws. The display unit can be placed in the mounting afterwards. Make sure the display unit sits
in the mounting tightly.