WIKA air2guide A2G-85 User manual

DE
EN
Operating instructions
Betriebsanleitung
Ventilation duct sensor for CO2and temperature
Model A2G-85
Model A2G-85
Lüftungskanalfühler für CO2und Temperatur
Typ A2G-85

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WIKA operating instructions model A2G-85
DE
EN
© 03/2011 WIKA Alexander Wiegand SE & Co. KG
All rights reserved. / Alle Rechte vorbehalten.
WIKA®is a registered trademark in various countries.
WIKA®ist eine geschützte Marke in verschiedenen Ländern.
Prior to starting any work, read the operating instructions!
Keep for later use!
Vor Beginn aller Arbeiten Betriebsanleitung lesen!
Zum späteren Gebrauch aufbewahren!
Operating instructions model A2G-85 Page 3 - 26
Betriebsanleitung Typ A2G-85 Seite 27 - 49

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Contents
Contents
Declarations of conformity can be found online at www.wika.com.
1. General information 4
2. Design and function 5
3. Safety 7
4. Transport, packaging and storage 11
5. Commissioning, operation 12
6. Menu navigation 16
7. Maintenance, cleaning and recalibration 20
8. Dismounting, return and disposal 21
9. Specications 24

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WIKA operating instructions model A2G-85
1. General information
■
The ventilation duct sensor described in the operating instructions
has been manufactured using state-of-the-art technology. All
components are subject to stringent quality and environmental
criteria during production. Our management systems are certied to
ISO 9001 and ISO 14001.
■
These operating instructions contain important information on
handling the instrument. Working safely requires that all safety
instructions and work instructions are observed.
■
Observe the relevant local accident prevention regulations and
general safety regulations for the instrument's range of use.
■
The operating instructions are part of the product and must be kept
in the immediate vicinity of the instrument and readily accessible to
skilled personnel at any time. Pass the operating instructions on to the
next operator or owner of the instrument.
■
Skilled personnel must have carefully read and understood the
operating instructions prior to beginning any work.
■
The general terms and conditions contained in the sales
documentation shall apply.
■
Subject to technical modications.
■
Further information:
- Internet address: www.wika.de / www.wika.com
www.air2guide.com
- Relevant data sheet: SP 69.07
1. General information

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2. Design and function
2.1 Overview
Case
Mounting ange
Probe sleeve
2.2 Description
The model A2G-85 ventilation duct sensor with an integrated CO2and
temperature measurement is suitable for direct mounting on circular
ventilation pipes or rectangular ventilation ducts.
The A2G-85 is a high-quality product solution for ventilation and
air-conditioning applications.This ventilation duct sensor measures
carbon dioxide (CO2) in accordance with the NDIR measurement
principle, and in addition also temperature. Due to the combination
of these two measurands in one single instrument, the material and
mounting cost is considerably reduced.



2. Design and function

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WIKA operating instructions model A2G-85
The measurement of the CO2content and the air temperature as the
basis of demand-orientated control/regulation is gaining ever more
importance in the ventilation and air-conditioning industry. The sensor
signals for both measurands are transmitted to the control/regulation or
building automation with analogue output signals (0 … 10 V, 4 … 20 mA)
or digital Modbus®protocol.
2.3 Dimensions in mm
H
A
B
C
G
D
E
F
I
H
A
B
C
G
D
E
F
I
Adjustable 40 … 155 mm
Dimensions in mm [in]
A B C D E F Ø G H I
119 45 5.2 70 15 186 12 95.5 88.5
2.4 Scope of delivery
■
Digital ventilation duct sensor for CO₂ and temperature
■
Mounting ange
Cross-check scope of delivery with delivery note.
2. Design and function

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3. Safety
3.1 Explanation of symbols
WARNING!
... indicates a potentially dangerous situation that can result in
serious injury or death, if not avoided.
CAUTION!
... indicates a potentially dangerous situation that can result in
light injuries or damage to property or the environment, if not
avoided.
DANGER!
... identies hazards caused by electrical power. Should the
safety instructions not be observed, there is a risk of serious
or fatal injury.
WARNING!
... indicates a potentially dangerous situation that can result in
burns, caused by hot surfaces or liquids, if not avoided.
Information
... points out useful tips, recommendations and information for
ecient and trouble-free operation.
3.2 Intended use
The model A2G-85 ventilation duct sensor is used for the detection of
carbon dioxide (CO2) and temperature in living, oce and production
spaces, assembly rooms, rooms for large gatherings, etc.
This instrument is not permitted to be used in hazardous areas!
3. Safety

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WIKA operating instructions model A2G-85
The instrument has been designed and built solely for the intended use
described here, and may only be used accordingly.
The technical specications contained in these operating instructions
must be observed. Improper handling or operation of the instrument
outside of its technical specications requires the instrument to be taken
out of service immediately and inspected by an authorised WIKA service
engineer.
The manufacturer shall not be liable for claims of any type based on
operation contrary to the intended use.
3.3 Improper use
WARNING!
Injuries through improper use
Improper use of the instrument can lead to hazardous
situations and injuries.
▶Refrain from unauthorised modications to the instrument.
▶Do not use the instrument within hazardous areas.
▶Do not use the instrument with abrasive or viscous media.
Any use beyond or dierent to the intended use is considered as
improper use.
Do not use this instrument in safety or emergency shutdown devices.
3.4 Responsibility of the operator
The instrument is used in the industrial sector.The operator is therefore
responsible for legal obligations regarding safety at work.
The safety instructions within these operating instructions, as well as the
safety, accident prevention and environmental protection regulations for
the application area must be maintained.
The operator is obliged to maintain the product label in a legible
condition.
3. Safety

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To ensure safe working on the instrument, the operating company must
ensure
■
that the operating personnel are regularly instructed in all topics
regarding work safety, rst aid and environmental protection and know
the operating instructions and, in particular, the safety instructions
contained therein.
■
that the instrument is suitable for the particular application in
accordance with its intended use.
■
that personal protective equipment is available.
3.5 Personnelqualication
WARNING!
Riskofinjuryshouldqualicationbeinsucient
Improper handling can result in considerable injury and
damage to property.
▶The activities described in these operating instructions
may only be carried out by skilled personnel who have the
qualications described below.
Skilled electrical personnel
Skilled electrical personnel are understood to be personnel who, based
on their technical training, know-how and experience as well as their
knowledge of country-specic regulations, current standards and directives,
are capable of carrying out work on electrical systems and independently
recognising and avoiding potential hazards.The skilled electrical personnel
have been specically trained for the work environment they are working
in and know the relevant standards and regulations.The skilled electrical
personnel must comply with current legal accident prevention regulations.
Operating personnel
The personnel trained by the operator are understood to be personnel
who, based on their education, knowledge and experience, are capable
of carrying out the work described and independently recognising
potential hazards.
Special operating conditions require further appropriate knowledge, e.g.
of aggressive media.
3. Safety

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WIKA operating instructions model A2G-85
3.6 Labelling, safety marks
Product label (example)
Model
Measuring range
Output signal
Supply voltage
Serial number
Before mounting and commissioning the instrument, ensure
you read the operating instructions!
Type: A2G-50
Range: -250 ... +250 Pa
Output: 0 ... 10 V / 4 ... 20 mA
Supply: DC 24 V / AC 24 V ±10 % < 1 W
Made in EU E-Nr. 66209848





3. Safety

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4. Transport, packaging and storage
4.1 Transport
Check the instrument for any damage that may have been caused by
transport.
Obvious damage must be reported immediately.
CAUTION!
Damage through improper transport
With improper transport, a high level of damage to property
can occur.
▶When unloading packed goods upon delivery as well as
during internal transport, proceed carefully and observe
the symbols on the packaging.
▶With internal transport, observe the instructions in chapter
4.2 “Packaging and storage”.
If the instrument is transported from a cold into a warm environment, the
formation of condensation may result in instrument malfunction. Before
putting it back into operation, wait for the instrument temperature and the
room temperature to equalise.
4.2 Packaging and storage
Do not remove packaging until just before mounting.
Keep the packaging as it will provide optimum protection during transport
(e.g. change in installation site, sending for repair).
Permissible conditions at the place of storage:
Storage temperature: -20 ... +70 °C
Avoid exposure to the following factors:
■
Direct sunlight or proximity to hot objects
■
Mechanical vibration, mechanical shock (putting it down hard)
■
Soot, vapour, humidity, dust and corrosive gases
■
Hazardous environments, ammable atmospheres
4. Transport, packaging and storage

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WIKA operating instructions model A2G-85
Store the instrument in its original packaging in a location that fulls the
conditions listed above. If the original packaging is not available, pack
and store the instrument as described below:
1. Wrap the instrument in an antistatic plastic lm.
2. Place the instrument, along with the shock-absorbent material, in the
packaging.
3. If stored for a prolonged period of time (more than 30 days), place a
bag containing a desiccant inside the packaging.
5. Commissioning, operation
Personnel: Skilled electrical personnel
Tools:Voltage tester, screwdriver
WARNING!
Physical injuries and damage to property and the
environment caused by hazardous media
Upon contact with hazardous media (e.g. oxygen, acetylene,
ammable or toxic substances), harmful media (e.g. corrosive,
toxic, carcinogenic, radioactive), and also with refrigeration
plants and compressors, there is a danger of physical injuries
and damage to property and the environment.
Should a failure occur, aggressive media with extremely high
temperature and under high pressure or vacuum may be
present at the instrument.
▶For these media, in addition to all standard regulations,
the appropriate existing codes or regulations must also be
followed.
CAUTION!
Damage to the instrument
When working on open electric circuits (PCBs) there is a
risk of damaging sensitive electronic components through
electrostatic discharge.
▶The correct use of grounded working surfaces and
personal armbands is required.
4. Transport ... / 5. Commissioning, operation

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DANGER!
Danger to life caused by electric current
Upon contact with live parts, there is a direct danger to life.
▶The instrument may only be installed and mounted by
skilled personnel.
▶Operation using a defective power supply unit (e.g. short-
circuit from the mains voltage to the output voltage) can
result in life-threatening voltages at the instrument.
▶Only switch the power supply on once the instrument has
been properly installed.
1. Mount the instrument in the desired location (see chapter 5.1
“Mechanical mounting”).
2. Open the instrument cover, lay the cable and connect in accordance
with the pin assignment (see chapter 5.2 “Electrical mounting”).
3. The instrument is now ready for conguration.
5.1 Mechanical mounting
■
Select a mounting location (at a duct).
■
Use the mounting ange as a template and mark the screw holes.
■
Mount the ange to the duct with the screws (screws are not included
in delivery).
Mount the ange
5. Commissioning, operation

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WIKA operating instructions model A2G-85
■
Insert the probe to the desired depth.The end of the probe must
reach the middle of the duct.
■
Fasten the screws tightly to the ange in order that the probe is held in
position.
Tighten the
screw
Mount the probe into the ange
Tighten the
screws
Air flow direction Air flow direction
Air flow direction Air flow direction Air flow direction
Strain relief facing down
Air ow direction Air ow direction
Air ow direction Air ow direction Air ow direction
Strain relief directed downwards
5. Commissioning, operation

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5. Commissioning, operation
5.2 Electrical mounting
The ventilation duct sensor is designed to operate with safety extra-low
voltage (SELV). It must be operated at a constant operating voltage
(±0.2 V). Current/voltage spikes from switching the supply voltage on or
o must be prevented by the customer.
Unscrew the strain relief and connect the cable in accordance with the
connection diagram.Then screw the strain relief back tightly.
Connection diagram
CO2
T
24 V
GND
Supply voltage UB
Output DC 0/2 … 5/10 V
Output DC 0/2 … 5/10 V
Output 4 … 20 mA
Output 4 … 20 mA
CO2
T
Optional mA output
A
B
24 V
GND
Supply voltage UB
Modbus®B
Modbus®A
Modbus®output signal
V V

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WIKA operating instructions model A2G-85
When using long connection wires it may be necessary to use
a separate GND wire for voltage output current to prevent
measurement distortion.The need for an extra GND wire
depends on the cross section and length of the used
connection wires. If long and/or small cross section wires are
used, supply current and wire resistance may generate a
voltage drop in the common GND wire resulting in a distorted
output measurement.
6. Menu navigation
6.1 Standard version
1. Selecting the instrument menu
Keep the selection button “SELECT” pressed for at least 2 seconds to
access the menu.
▶MENU is displayed
2. Selecting and adjusting the parameters
Press the “DOWN” button once
▶Next menu item is displayed
Supply voltage UB
Output DC 0/2 … 5/10 V
Output DC 0/2 … 5/10 V
V V
Extra GND wire
XXXXXXXX
XXXX
5. Commissioning, operation / 6. Menu navigation

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6. Menu navigation
Press the “SELECT” button once in order to activate
the selection of the parameter.
▶Selection ashes
Press “UP” or “DOWN” in order to dene the
desired value of the selection.
▶Selection is displayed
Press the “SELECT” button once in order to accept
the selection.
3. Select lower CO2limit: 0 ... 1,900 ppm
Press the “DOWN” button once
▶“CO2OUT MIN” menu item is displayed
4. Select upper CO2limit: 500 ... 2,000 ppm
Press the “DOWN” button once
▶“CO2OUT MAX” menu item is displayed
5. Select lower temperature measuring range
0 … 45 °C or 32 ... 112 °F
Press the “DOWN” button once
▶“TE OUT MIN” menu item is displayed
XXXXXXXX
XXXX
XXXXXXXX
XXXX
XXXXXXXX
XXXX
CO2OUT MIN
400 CO2ppm
CO2OUT MAX
2000 CO2ppm
TE OUT MIN
0.0 °C

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WIKA operating instructions model A2G-85
6. Menu navigation
6. Select upper temperature measuring range:
5 … 50 °C or 42 ... 122 °F
Press the “DOWN” button once
▶“TE OUT MAX” menu item is displayed
7. Select the upper value of the output signal:
5 V or 10 V
With mA outputs, “10 V” must be selected.
Press the “DOWN” button once
▶“MAX OUTPUT V” menu item is displayed
8. Select the lower value of the output signal:
0 V or 2 V
With mA outputs, “0 V” must be selected.
Press the “DOWN” button once
▶“MIN OUTPUT V” menu item is displayed
9. Select CO2 oset:±200CO2ppm
The oset function enables a eld calibration. This
is necessary in demanding applications that require
annual calibration.
Press the “DOWN” button once
▶“CO2OFFSET” menu item is displayed
10. Selecttemperatureoset:±5°Cor±9°F
Press the “DOWN” button once
▶“TE OFFSET” menu item is displayed
TE OUT MAX
50.0 °C
MAX OUTPUT V
10 V
MIN OUTPUT V
0 V
CO2OFFSET
0 CO2ppm
TE OFFSET
0.0 °C

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6. Menu navigation
11. Press the “SELECT” button in order to exit
the menu.
6.2 Modbus®version
1. Selecting the instrument menu
Press the “SELECT” button for at least two seconds
to access the menu.
▶“MENU” is displayed
2. Selecting and adjusting the parameters
→ see chapter 6.1 “Standard version”
3. Select Modbus®address: 1 … 247
Press the “DOWN” button once
▶“ADDRESS” menu item is displayed
4. Select the baud rate: 9,600, 19,200, 38,400
Press the “DOWN” button once
▶“BAUD RATE” menu item is displayed
5. Select the parity bit: None, even, odd
Press the “DOWN” button once
▶“PARITY BIT” menu item is displayed
6. Press the “SELECT” button in order to exit the
menu.
SELECT
EXIT MENU
MENU
ADDRESS
99
BAUD RATE
9600
PARITY BIT
NONE
SELECT
EXIT MENU

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WIKA operating instructions model A2G-85
Modbus®protocol
Register Parameter
description
Data type Value Range
3x0001 Program version 16 bit 0 … 1000 0.0 … 99.0
3x0003 CO2reading 400 … 2000 400 … 2,000
3x0004 Temperature
reading
0 … 500 0.0 … 50.0 °C
7. Maintenance, cleaning and recalibration
Personnel: Skilled electrical personnel
Tools:Voltage tester, screwdriver
For contact details, see chapter 1 “General information” or the
back page of the operating instructions.
7.1 Maintenance
This instrument is maintenance-free and oers long service life provided
it is handled and operated properly.
Repairs must only be carried out by the manufacturer or appropriately
qualied skilled personnel.
7.2 Cleaning
CAUTION!
Physical injuries and damage to property and the
environment
Improper cleaning may lead to physical injuries and damage
to property and the environment. Residual media in the
dismounted instrument can result in a risk to persons, the
environment and equipment.
▶Carry out the cleaning process as described below.
6. Menu navigation / 7. Maintenance, cleaning ...