CTS-M20 Instruction Manual

CTS-M20 Instruction Manual
CTS-M20
CARBON DIOXIDE
TRANSMITTER/SENSOR
INSTALLATION
OPERATION AND MAINTENANCE
MANUAL
QUATROSENSE ENVIRONMENTAL LTD.
5935 OTTAWA STREE, PO BOX 749 RICHMOND, ONTARIO CANADA KOA 2Z0
PHONE: (613) 838-4005 FAX: (613) 838-4018
Web: www.QELsafety.com Email: QEL@QELsafety.com
M-20 Operation And Maintenance Manual
Configuration:
(User settings are set to default settings, unless otherwise indicated below)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Gas sensed
Signal mode
Signal “CO2 From” point
Signal “CO2 To” point
Signal “Sig From” at
“CO2 From” point
Signal “Sig To” at
“CO2 To” point
Output signal clipping
Auto Zero
Altitude
Password
Relay
Relay On
Relay Off
Relay On Delay
Relay Off Delay
Global Average
Default Setting
J3 to Left
J3 to Right
Carbon Dioxide (CO2)
2-10V Linear
4-20mA Linear
0ppm
2500 ppm
2.0V
4.0mA
10.0V
User Setting
20.0mA
Disabled
No
300 feet
0017
Enabled
1000ppm
950ppm
0 minutes
0 minutes
360ppm
Specifications:
(The manufacturer reserves the right to change these at any time)
Input Power (Nominal)
Input Power Range
Sensor Type
Enclosure Materials
Output Signal
Temperature
Humidity
Pressure
Sensor Response Time
Accuracy
Repeatability
Range
Display
Relay Output
Relay Time Delays
Mounting
Software
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24 VAC or 24 VDC (Isolated)
18-40VAC or 18-40VDC
Non-Dispersive Infra Red (NDIR)
Thermo compensated aluminum block
Polycarbonate / ABS blend, Fire Retardant
0 - 20 mA, 4-20mA, 0-10V or 2-10 V or User Range linear.
5º C to 40º C
0 to 99% RH, non-condensing
Atmospheric ±10%
Less than 45 seconds for 90% of step change
±2% of range
± 10 ppm
Default 0 to 2500 ppm (4.0 – 20.0mA)
User Programmable 0 to 5000 ppm (0-10V or 0-20mA)
Alphanumeric 2-line X 8-digit LCD
One Single Pole Double Throw (SPDT), Form C, 1 amp dry contact
(CSA 1500 V, FCC Part 68)
Actuation – 0 to 60 minutes in 5-minute increments.
De-actuation – 0 to 60 minutes in 5-minute increments.
Screw mounts to a standard 2” X 4” electrical junction box.
Version 3.00 Revision A (or later)
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Special Features
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Signal output options include negative slope.
Signal end-points: adjustable ppm, 0-10V, 0-20mA.
Adjustable relay dead-band.
Relay can activate for decreasing ppm.
Simulation mode to simulate any ppm value from 0 to 5000.
Auto Zero to global average over 8-day period.
Password protection for user settings.
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Table of Contents
1.
INTRODUCTION......................................................................................4
1.1
1.2
1.3
1.4
1.5
1.6
1.7
Principle of Operation .............................................................................4
Display .................................................................................................5
Keypad .................................................................................................5
Output Signal ........................................................................................5
Signal Range .........................................................................................5
Relay....................................................................................................7
Power ...................................................................................................7
2.
OPERATION ............................................................................................8
3.
FAULT INDICATION................................................................................8
4.
CONFIGURATION....................................................................................9
4.1
4.2
4.3
4.4
4.5
5.
User Interface .......................................................................................9
Menu Activation .....................................................................................9
Menu Item Selection ............................................................................ 10
Menu Item Alteration ........................................................................... 10
Menu Tree........................................................................................... 10
CALIBRATION.......................................................................................20
5.1
5.2
5.3
5.4
6.
Equipment Required............................................................................. 20
Gain Check.......................................................................................... 20
Zero Calibration ................................................................................... 21
Span Calibration .................................................................................. 21
TROUBLESHOOTING .............................................................................22
6.1
6.2
Troubleshooting Tips ............................................................................ 22
Fault Codes ......................................................................................... 24
7.
DUCT MOUNT ADAPTER (CTS-M2000X-D00000) ..................................25
8.
WIRING AND POWER SUPPLY ..............................................................26
WARRANTY STATEMENT .............................................................................28
Table of Figures
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
1 - Internal View and Features ................................................................4
2 - Signal Mode Jumper (J3)....................................................................5
3 - Duct Mount Configuration ................................................................ 25
4 - Duct Cutout.................................................................................... 25
5 - 24VAC Floating Supply (4-Wire Installation) ...................................... 26
6 - 24 VAC with Separate Grounds (4-Wire Installation)........................... 26
7 - 24VAC with Common Grounds (3-Wire Installation) ............................ 26
8 - 24VDC Supply with Common Ground (3-Wire Installation) .................. 27
9 - 24VDC Supply with Separate Ground (4-Wire Installation) .................. 27
10 - 24VDC Ungrounded Supply (4-Wire Installation) .............................. 27
11 - 24VDC Ungrounded Supply (3-Wire Installation) .............................. 27
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1. Introduction
This manual applies to M-20 units with software Version 3.01 and later (released 2008-0103). If you have a product with software Version 1.XX, please contact the factory to obtain a
copy of the correct manual.
1.1 Principle of Operation
The M-20 is a microprocessor controlled CO2 Sensor/Transmitter using infrared sensing
technology. The concentration of CO2 is measured by determining the amount of absorption
of light in a specific frequency band.
An analog signal output is provided, as well as a relay with adjustable set points. New
features for Version 3.01 software are; extension of the signal output range down to 0V (or
0mA) and a Simulation Mode to assist in testing the installation before commissioning. The
field calibration features of the unit are extended as well.
The unit operates from nominal 24VAC or 24VDC and incorporates an isolated switching
power supply.
Figure 1 - Internal View and Features
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1.2 Display
The display module is a 2-line by 8-character LCD. The gas concentration display format in
measurement mode is as follows:
CO2 ppm
XXXX
Where xxxx is concentration of CO2, shown from -999 to 9999. The displayed number
includes leading zeros if below 1000. Negative concentrations indicate that the unit requires
calibration. The concentration is updated every 10 seconds.
NOTE: The display range is not the same as the analog output signal range. If the
signal range is set to 2500 ppm, the concentration will be displayed above
the signal range, even though the signal has already stopped at 20 mA or
10V. The concentration display is linear up to 5000 ppm. Above 5000ppm,
the measurement becomes non-linear. The display has a maximum reading
of 9999 ppm, in which case the actual concentration may be above
9999ppm.
1.3 Keypad
The keypad is a set of three buttons recessed along the upper right side of the enclosure. It
is not necessary to open the cover for use. Access to the menu system is password
protected. Press any key for 3 seconds to enter the menu system (see below for details).
1.4 Output Signal
Options for the analog output signal are: 4-20 mA linear (default) or 2-10V linear. The output
mode can be chosen moving the J3 jumper. For over range concentrations the signal can
exceed the range slightly (above 20mA or 10V) if clipping is disabled (see below for details).
Jumper 3 (J3) is located in the top-right hand corner of the circuit card.
Figure 2 - Signal Mode Jumper (J3)
1.5 Signal Range
Signal range assignments allow the user to choose how the analog output signal is calculated
from the gas concentration. This allows direct operation of louvers and fan speeds.
The default settings are 0ppm CO2 = 4.0mA and 2500 ppm CO2 = 20.0mA, with linear signal
between the two points. These settings will cover 90% or more of applications for indoor air
quality control.
The user may assign any gas concentration between 0 and 5000 ppm to each range point in
steps of 50 ppm. The lower concentration point is called the “CO2 From” point and the upper
concentration point is called the “CO2 To” point. The software will limit the minimum range
(difference between the two points) to 500ppm.
NOTE: The “CO2 To” point cannot be set smaller than the “CO2 From” point.
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The corresponding Voltage or Current points can be adjusted between 0V and 10V (for
voltage output mode) or 0mA to 20mA (for current output mode).
The current (or Voltage) points can be set to any relation, meaning the “Sig From” point and
“Sig To” point can be swapped to obtain an output response with a negative slope. For a
negative slope the output Voltage (or current) will decrease as the concentration increases.
NOTE: Always set the “JumperJ3” setting to match J3 on the unit. It is advisable to
maintain at least 4V or (8mA) between the two “Sig” points. The software
does not perform checking on these settings. While in the menu system, or
before the first measurement, the signal is set to “Sig From”.
When “Clipping” is enabled, the signal output will not go beyond either of the two current (or
Voltage) end-points. When “Clipping” is disabled, the signal output will go to 0V or 0mA
minimum to about 10.75V (21.5mA) maximum.
Signal Output Options
“JumperJ3”
Setting
“LeftVDC”
“Clipping”
Setting
“Disable”
“LeftVDC”
“Enable”
“RightMA”
“Disable”
“RightMA”
“Enable”
Jumper
J3
Analog Output
Signal Range
0.0V – 10.75V
(default)
“Sig From” – “Sig
To”
in Volt
0.0mA – 21.5mA
“Sig From” – “Sig
To”
in mA
Signal Setting Examples
Example
500-1500ppm
2.5V – 8.5V
500-1500ppm
2.5V – 8.5V
0-2500ppm
1.0V – 5.0V
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Settings
Jumper
J3
“JumperJ3” = “LeftVDC”
“CO2 From” = “0500ppm”
“CO2 To” = “1500ppm”
“Sig From” = “02.50V”
“Sig To” = “08.50V”
“Clipping” = “Disable”
“JumperJ3” = “LeftVDC”
“CO2 From” = “0500ppm”
“CO2 To” = “1500ppm”
“Sig From” = “02.50V”
“Sig To” = “08.50V”
“Clipping” = “Enable”
“JumperJ3” = “LeftVDC”
“CO2 From” = “0000ppm”
“CO2 To” = “2500ppm”
“Sig From” = “01.00V”
“Sig To” = “05.00V”
“Clipping” = “Disable”
6
Analog Output
Signal Range
0.0V – 10.75V
2.5V – 8.5V
1.0V – 10.0V
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Example
0-2500ppm
1.0V – 5.0V
0-2500ppm
4.0mA – 20.0mA
(default)
0-2500ppm
4.0mA – 20.0mA
(default with clipping
enabled by user)
0-5000ppm
0.0mA – 20.0mA
Settings
Jumper
J3
“JumperJ3” = “LeftVDC”
“CO2 From” = “0000ppm”
“CO2 To” = “2500ppm”
“Sig From” = “01.00V”
“Sig To” = “05.00V”
“Clipping” = “Enable”
“JumperJ3” = “RightMA”
“CO2 From” = “0000ppm”
“CO2 To” = “2500ppm”
“Sig From” = “04.00mA”
“Sig To” = “20.00mA”
“Clipping” = “Disable”
“JumperJ3” = “RightMA”
“CO2 From” = “0000ppm”
“CO2 To” = “2500ppm”
“Sig From” = “04.00mA”
“Sig To” = “20.00mA”
“Clipping” = “Enable”
“JumperJ3” = “RightMA”
“CO2 From” = “0000ppm”
“CO2 To” = “5000ppm”
“Sig From” = “00.00mA”
“Sig To” = “20.00mA”
“Clipping” = “Enable”
Analog Output
Signal Range
1.0V – 5.0V
4.0mA – 21.5mA
4.0mA – 20.0mA
0.0mA – 20.0mA
IMPORTANT: The Signal Range is the applied range of the analog output signal. The
Display Range is independent of the signal range and is defined from
0ppm to 5000 ppm. It is non-linear above 5000 ppm to a maximum of
9999ppm. Negative concentrations may be shown, but indicate that
the unit needs calibration. The global average for CO2 is in the order
of 360ppm and should be the lowest concentration measured under
most conditions.
1.6 Relay
One single pole double throw (SPDT; Form C, Dry contacts) with 1 Ampere rating is standard.
Configuration allows adjustment for actuation point, dead band, and delays. The relay
settings have the same range as the display (0-5000ppm), and are independent of the
analog output signal range.
NOTE:
The relay set points may be set to operate on declining gas concentrations
simply by setting the de-actuation set point (“RelayOff”) to a greater
concentration than the actuation set point (“Relay On”).
1.7 Power
The M-20 can be powered from an AC or DC power source with nominal voltage of 24V. The
power supply is isolated and therefore few restrictions exist in the number of wiring
configurations.
NOTE:
The power input is isolated from the internal power of the unit, but the
analog signal output is not isolated from the internal power of the unit. For
installations where isolation is required for the signal, the power supply
isolation will be sufficient. The user needs to bear in mind that the analog
output signal is referenced to the secondary side of the isolated power
supply.
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2. Operation
When the unit is powered up, it displays a software revision string, followed by the gas
identification string as shown below:
The display shows the software revision for 3 seconds:
QEL M-20
V3.01 RA
Where “V3.01” indicates the software Version and “RA” the software Revision number.
The revision string is followed by:
CO2 ppm
---Where “----” indicate that the first measurement is in process.
After 10 seconds, the bottom display line will show the concentration of CO2 in ppm. The
measurement is updated every 10 seconds.
3. Fault Indication
Should an internal fault occur, the unit will display:
FAULT 0X
Where X is a fault code, ranging from 0 to 9. Please refer to the Troubleshooting section for a
list of fault codes.
NOTE:
Please refer to the troubleshooting section if you notice any unexpected
message indications (e.g.: Defaults Loaded). A fault code will be
displayed for 10 seconds, after which the unit will restart and attempt to
resume normal operation.
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4. Configuration
All configuration of the unit, except the signal output mode (set with J3) is done through a
software user menu system. The menu system is protected by a password. To provide
protection to certain sensitive parameters, some menu items are hidden and need to be
enabled before they can be accessed.
The M-20 enters its measurement mode automatically after power up. The first concentration
reading is available after 10 seconds. If the default configuration matches the requirements
of the installation, the power and analog output signal can be connected, after which the unit
will enter service when powered up.
If the installation requires any of the default settings to be altered, it can be done through a
user-friendly menu system. The user settings are saved in non-volatile RAM and will be
preserved, should power be removed during operation.
NOTE:
It is not necessary to open the enclosure to perform calibration or to change
the default settings. The ‘keypad’ switches are located in the upper right side
of the enclosure, and the gas ports are located at the bottom (see Figure 1).
4.1 User Interface
The M-20 user interface consists of a 2-line by 8-character alphanumeric LCD and a threebutton keypad.
The top LCD line is used to indicate the setting and the second LCD line contains the value for
the setting. Most settings use a numeric value (e.g.: 0500ppm) and some use a toggle string
(e.g.: “Disable” or “Enable”).
The keypad consists of three pushbutton switches. The pushbutton switches are marked S1,
S2 and S3. Each button performs a specific function as follows:
S1 = Scroll Up or Increment value (top button)
S2 = Scroll down or Decrement value (middle button)
S3 = Enter Alteration Mode or Accept value (bottom button)
The three switches will be referred to as Up (Top), Dn (Middle) and Enter (Bottom).
NOTE:
The pushbutton switches are recessed to discourage tampering with the unit.
A small screwdriver, pen or similar object is required to reach the switches.
TIP:
Two levels of key repeat is provided for the Up and Dn keys. A slow repeat
activates after about half a second of holding the key in. After a few
seconds, the key will go to fast repeat to enable quick setting of a value with
large difference.
4.2 Menu Activation
Press and hold any key for 3 seconds to activate the password request sequence. Select the
password by scrolling to the user password (which is actually a number from 0000 to 0255)
using the Up and Dn keys. When the password is reached, press the Enter key.
If the correct password was entered, the first item in the menu tree will be shown (see Menu
Tree below). An incorrect password will be rejected and followed by a restart of the unit,
similar to the power up sequence. Entering numerous incorrect passwords cannot cause harm
to the unit, or cause it to lock out a subsequent valid password.
NOTE:
The default password is 0017, but it can be changed by the user to any
value between 0000 and 0255.
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WARNING:
Please keep proper record of the password, should it be
changed from the default. Call the factory for support if it was
lost.
4.3 Menu Item Selection
Use the scroll buttons (Up or Dn) to scroll up and down through the menu tree.
TIP:
When the bottom of the menu tree is reached, further downward scrolling
will roll over to the top. To reach the bottom of the menu tree in quick
fashion, press Up to roll over to the bottom of the menu tree.
4.4 Menu Item Alteration
Activate the Menu Item Alteration mode by pressing Enter while displaying any menu item.
The data alteration mode is indicated by an asterisk (*) in the right-hand side of the bottom
LCD display line. This indicates that the variable may be changed by scrolling (using Up or
Dn).
To accept the selected value, press Enter. The * will disappear, meaning that subsequent use
of Up and Dn will select the previous or next item in the menu tree.
4.5 Menu Tree
The menu tree is explained in the table below. The order of items in the table is as they
appear from the first item down to the last.
The “JumperJ3” item is the first (or top) item in the menu tree (or menu item list). To go to
the next item, press the Dn key. To go to the last item in the list from the “JumperJ3” item,
press the Up key to roll over to the last item.
Please note that, depending on certain selections, the length of the menu item list is altered.
The “Calibr..” item adds the calibration items to the tree when “Enable” is selected. The
“Factory.” item adds the factory setup items to the tree when “Enable” is selected.
To return to the measure mode and exit from the menu tree, scroll up or down to the “Exit”
menu item.
Menu Item List
Item
Name
“JumperJ3”
Item Range
Default
“LeftVDC”
or
“RightMA”
“RightMA”
Description/Function
When using the analog signal output in
Voltage mode (J3 set to the left), select
“LeftVDC”.
When using the 0-20mA analog signal
mode (J3 set to the right), select
“RightMA”
NOTE:
This setting does not change the output
mode, but selects the units and values to
be used when setting the analog signal
end-points.
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Item
Name
“CO2 From”
“CO2 To”
“Sig From”
Item Range
Default
0ppm
to
“CO2 To” - 500ppm.
0ppm
“CO2From”+500ppm
to
5000ppm
2500ppm
0.00V to 10.00V
or
0.00mA to 20.0mA
4.0mA
0.00V to 10.00V
or
0.00mA to 20.0mA
20.0mA
“Enable” or “Disable”
NOTE:
This setting is limited to “CO2 To” minus
500ppm. If you want to set it to a certain
value and scrolling up “gets stuck”, go to
the “CO2 To” setting and set it higher
first.
Adjust the upper ppm point for the analog
signal output in steps of 50ppm.
NOTE:
This setting has a lower limit of “CO2
From” plus 500ppm. If you want to set it
to a certain value and scrolling down “gets
stuck”, go back to the “CO2 From” setting
and set it lower first.
Adjust the signal output level at “CO2
From” ppm in steps of 0.05V or 0.10mA.
NOTE:
Please maintain at least 4.00V or 8.00mA
between “Sig To” and “Sig From” for
proper operation of the output signal.
Adjust the signal output level at “CO2 To”
ppm in steps of 0.05V or 0.10mA.
NOTE:
The units depend on the setting of
“JumperJ3” above.
NOTE: “Sig To” may
be set higher
or lower than
“Sig From”.
“Clipping”
Adjust the lower ppm point for the analog
signal output in steps of 50ppm.
NOTE:
The units depend on the setting of
“JumperJ3” above.
NOTE: “Sig From”
may be set
higher or
lower than
“Sig To”.
“Sig To”
Description/Function
“Disable”
NOTE:
Please maintain at least 4.00V or 8.00mA
between “Sig From” and “Sig To” for
proper operation of the output signal.
With clipping set to “Enabled”, the analog
output signal will be limited to “Sig From”
to “Sig To”. If the concentration drops
below “CO2 From”, the output signal will
be clipped to “Sig From”. If the
concentration rises above “Sig To” the
signal output will not rise above “Sig To”.
With clipping set to “Disabled”, the signal
output will range from 0.00V to just over
10.00V (or 0.0mA to just over 20.0mA).
The output will therefore have a range
beyond “Sig From” and “Sig To”.
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Item
Name
“AutoZero”
Item Range
Default
“Yes” or “No”
“No”
Description/Function
When “AutoZero” is set to “Yes”, the unit
will gather the lowest ppm reading in an
8-day period and set the unit calibration
so that the lowest reading indicate the
global average of around 360ppm.
When “AutoZero” is set to “No”, the unit
will not adjust its own calibration and work
off the last manual or factory calibration.
“Altitude”
0 to 9999 feet (ft)
300 ft
“PassWord”
0000 to 0255
0017
“Relay”
“Relay On”
“Enable” or “Disable”
0 – 5000ppm
“RelayOff’
0 – 5000ppm
“Delay On”
NOTE:
Do not set the dead
band to be lower
than 50ppm to allow
proper operation of
the relay.
0 – 60 minutes
“Enable”
1000ppm
950ppm
NOTE:
“AutoZero” works best in situations where
the building will purge at night (or over a
weekend) to the global average CO2
concentration.
The altitude of the installed unit above sea
level in feet. Can be set in steps of 50 ft.
User password, required for entering the
menu system.
NOTE:
Please make sure you keep a record of the
password if changed.
Select “Enable” to update the relay status
from the measured concentration.
When “Disable” is selected, the relay is
passive and remains non-energized.
The concentration at which the relay will
be energized.
NOTE:
If “Relay On” is set lower than “Relay Off”,
the relay will energize when the
concentration drops below the
concentration set for “Relay On”. This
causes and inverted relay action.
The concentration at which the relay will
be de-energized.
NOTE:
The dead band is the difference between
“Relay On” and “Relay Off”. The default
dead band is therefore 50ppm.
0 min
“Delay On” is the time delay in minutes
after the concentration passed the “Relay
On” concentration until the relay is
energized.
This delay can be used to eliminate
nuisance fan start-ups. The delay can be
set in increments of 5 minutes.
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Item
Name
“DelayOff”
“Simulate”
“Exit”
Item Range
Default
0 – 60 minutes
0 min
0-5000ppm
“Save” or “KeepOld”
500ppm
“Save”
Description/Function
“Delay Off” is the time delay in minutes
after the concentration passed the
“RelayOff” concentration until the relay is
de-energized.
This delay can be used to extend the fan
running time after the concentration has
dropped below “RelayOff”. The delay can
be set in increments of 5 minutes.
Any CO2 concentration from 0ppm to
5000ppm can be simulated by pressing
Enter at this item. While the * is shown
the simulated concentration can be set
with the Up or Dn keys.
This feature is available for evaluating the
user settings and testing the installation
(e.g.: the travel of the valve, fan speed,
relay set points, etc. can be verified.)
This is the menu exit point, which returns
the unit to the measurement mode.
TO
1)
2)
3)
SAVE YOUR CHANGES:
Press Enter (* appears).
Choose “Save” with Up or Dn.
Press Enter to save your changes in
non-volatile RAM.
4) A confirmation string “Data Saved” will
be displayed for a few seconds.
5) The unit returns to measure mode.
TO UNDO YOUR CHANGES:
1) Press Enter (* appears).
2) Choose “KeepOld” with Up or Dn,
which will restore the last settings
from non-volatile RAM and not save
the new settings.
3) Press Enter to dump your changes and
restore the values in non-volatile RAM.
4) The unit returns to measure mode.
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Item
Name
“Calibr..”
Item Range
Default
“Enable” or “Disable”
“Disable”
Description/Function
CAUTION: Do not choose “Enable” if
you do not intend to
calibrate the unit and
have calibration gas
available.
If “Disable” is selected, this item is the
end of the menu list. Pressing Dn will roll
over to the top menu item.
If “Enable” is selected, the menu list is
extended to include the calibration menu
items.
Choose “Enable” if you want to calibrate
the unit.
“Zero Cal”
0ppm ± 50ppm
0ppm
NOTE:
This item will be defaulted to “Disable”
when returning to measure mode.
NOTE:
Please refer to the Calibration section in
the text below for more information.
PROCEDURE:
1) Apply 100% pure Nitrogen gas to the
unit, using an M-20 calibration kit.
2) Press Enter and see the * appear on
the bottom LCD line.
3) Wait for the concentration to stabilize,
it should be low and not too far from
0ppm.
4) Press Dn (or Up) to set the indicated
concentration to 0ppm. The Zero ppm
point is now calibrated.
5) If the concentration changes and restabilize more than 50ppm from zero,
press Up (or Dn) again.
6) Repeat step 5) until the concentration
shows a stable pattern between 0ppm
and 50ppm. Try not to accept a
negative concentration, unless it is
small (-10ppm to –1ppm).
7) Press Enter to accept (* disappears).
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Item
Name
“Span Cal”
Item Range
Default
2500ppm ± 50ppm
2500ppm
Description/Function
NOTE:
Please refer to the Calibration section in
the text below for more information.
EXCEPTION:
It is also possible to calibrate the span
with a different span gas concentration
than 2500ppm. In such cases, replace
2500ppm in this procedure with the
chosen span gas concentration (e.g.:
5000ppm). The unit will have non-linear
response for span calibration above
5000ppm.
PROCEDURE:
1) Apply 2500ppm CO2 (balance
Nitrogen) to the unit, using an M-20
calibration kit.
2) Press Enter and see the * appear on
the bottom LCD line.
3) Wait for the concentration to stabilize,
it should be 2500ppm ± 1000ppm.
4) Press Dn (or Up) to set the indicated
concentration to 2500ppm ± 50ppm.
As you get closer to 2500ppm, reduce
the number of Up or Dn key presses
between measurements.
5) If the concentration changes and restabilize more than 50ppm from
2500ppm, press Up or Dn to trim the
concentration.
6) Repeat step 5) until the concentration
shows a stable pattern between
2450pm and 2550ppm.
7) Press Enter to accept (* disappears).
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Item
Name
“Factory.”
Item Range
Default
“Enable” or “Disable”
“Disable”
Description/Function
CAUTION: Do not choose “Enable” if
you are not familiar with
technical procedures.
Some of the items in the
Factory Menu Require Zero
Gas, and some require a
calibrated DMM.
If “Disable” is selected, this item is the
end of the menu list. Pressing Dn will roll
over to the top menu item.
If “Enable” is selected, the menu list is
extended to include the factory setup
menu items.
Choose “Enable” if you want to update the
factory settings of the unit.
NOTE:
This item will be defaulted to “Disable”
when returning to measure mode.
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Item
Name
“Sig Cal”
Item Range
Default
0800 – 1023
951
Description/Function
NOTE:
Calibrating this setting in the mode
required for the specific application will
deliver better accuracy for the signal level.
NOTE:
The indicated value is a
proportion of 1023,
which results in a
desired output voltage
or current.
TIP 1:
If you are using the 0-20mA output mode
and want to perform an “in-circuit”
calibration, do not disconnect the signal
output lines from the target system and
connect the DMM positive probe to
“JACK1” and the negative probe to
“JACK2”. Proceed as described below, but
keep the DMM probes connected as
described here.
21.5mA = 1023/1023
20mA = 951/1023
TIP 2:
When using the 0-10V mode, the signal
connections can be left in place, resulting
in a calibration that includes the input
impedance of the target system.
REQUIRED:
1) Calibrated DMM (3½ or 4½ digit).
2) Philips screwdriver to open cover.
POCEDURE:
1) Disconnect the “SIG” line on “TB1” if
you are not performing a 0-20mA “incircuit” calibration (see TIP 1 and TIP
2 above).
2) Decide if you want to calibrate the
signal output for 0-10V or 0-20mA.
Set J3 to match your preference.
3) Select the scale on the DMM to your
preference (0-40mA scale for 0-20mA,
and 0 – 10V scale for 0-10V mode).
4) Insert the negative lead of the DMM
into the “JACK3” test point on the
circuit card (see TIP 1 above).
5) Insert the positive lead of the DMM
into the “JACK2” test point on the
circuit card (see TIP 1 above).
6) Press Enter (* appears). The signal
output will rise to 20mA or 10V.
7) Use Up or Dn to trim the signal output
to 10.01V or 20.01mA.
8) Press Enter (* disappears).
TIP 3:
You may need to find a compromise
between the lower and upper parts of the
range. When not in edit mode (* is off),
the “Sig From” level will be at the signal
output. Trim the adjustment if necessary
to have a closer match for “Sig From”.
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Item
Name
“Glob Ave”
“NitroRef”
Item Range
Default
Description/Function
0000 – 5000ppm
360ppm
This item is used by the AutoZero
function. Change it only if the global
average changes (guaranteed over time
to change) or if you want to use a
different value for the AutoZero function.
3850mV – 3950mV
3800mV
TIP:
If you have statistical data showing that
the building purges to, say 400ppm, over
an 8-day period, you can change “Glob
Ave” to a pseudo global average of
400ppm to obtain more accurate auto
zeroing.
CAUTION:
This item adjusts the gain of the front-end
amplifier and its zero reference.
Adjustment is required during production,
or if the lamp brightness has drifted over
time.
REQUIRED:
1) 100% Nitrogen used for Zero Cal.
2) 2500ppm CO2 span gas.
3) M-20 Calibration Kit.
4) Small flat screwdriver.
PROCEDURE:
1) Hook up the calibration kit as when
performing a Zero Cal.
2) Press Enter (* appears). The mV
reading will start updating as the lamp
cycles on and off at an 1 second rate.
3) Check the indicated mV reading after
it stabilizes. If the reading is stable
between 3850mV and 3950mV,
proceed to item 5).
4) Adjust VR1 until the reading is stable
between 3850mV and 3950mV. The
preferred target reading is 3900mV.
5) Press Enter (* disappears).
6) Perform a Zero Cal and Span Cal
(required) as described above.
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Item
Name
“Defaults”
Item Range
Default
“User” or “All”
“User”
Description/Function
WARNING: Choosing “All” will restore
defaults to all items in the
menu tree, including the
factory settings.
User Settings:
To load defaults to all user items, press
Enter (* appears) choose “User” with Up
or Dn, and press Enter to accept. A
confirmation string “Defaults Restored”
will be shown for a few seconds. The
calibration settings will not be changed.
All Settings (includes calibration):
To load defaults to all items, press Enter
(* appears) choose “All” with Up or Dn,
and press Enter to accept. A
confirmation string “Defaults Restored”
will be shown for a few seconds.
Perform a full factory and gas
calibration to restore the unit to
correct operation.
TIP:
If you changed your mind after restoring
“All” defaults, do the following:
1) Go straight to the “Exit” menu item
by pressing up (while * is not
shown).
2) Press Enter at the “Exit” menu item
(* appears).
3) Choose “KeepOld”.
4) Press Enter to accept.
5) The restored defaults will not be
saved to non-volatile RAM. All other
changes will also be lost.
6) The unit returns to the measure
mode.
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5. Calibration
This section is complemented by the detailed procedures outlined in the menu tree table
above. Refer to the menu tree table when performing a calibration.
In general, calibration should be performed at an ambient temperature close to the
temperature to which the unit will be exposed during operation. When matching the
calibration and operational temperature a more accurate calibration is obtained.
The recommended gas flow rate is approximately 0.2 to 0.4 liters/minute for all the
procedures in this section.
5.1 Equipment Required
The easiest way to obtain the equipment below is by means of a M-20 calibration kit. The list
of items required is as follows:
1)
2)
3)
4)
Zero Calibration Gas, which is Nitrogen (100% pure, normally >99.99% is available).
Span Calibration Gas, which is 2500ppm Carbon Dioxide, balanced with Nitrogen.
Pressure and Flow Limiting Regulator(s) 0.2 to 0.4 lpm (0.4 to 0.8 scfh).
Tubing and hose barb adaptors with 10-32 male threads.
NOTE: 2500ppm CO2 span gas is recommended for building air quality management
applications. Higher concentration span gas can be used up to 5000ppm CO2
for other applications. The span gas must be balanced with Nitrogen.
NOTE: The measurement cycle for Zero and Span Calibration is every 10 seconds.
The concentration is updated at the end of the light period. For the Gain
Check, the cycle is two seconds long.
5.2 Gain Check
The front-end amplifier gain check only need to be done in cases that are more exceptional:
1) When the lamp has drifted due to ageing.
2) Dirt particles accumulated in the sensing chamber.
3) Difficulty is experienced when performing a Zero or Span Calibration as described
below.
This procedure is similar to and requires the same setup as for a Zero Calibration. Follow the
procedure below (do not continue if you do not have Nitrogen available):
1) Complete the calibration setup using a M-20 calibration kit.
2) Scroll through the menu (as described in the previous chapter) to the “NitroRef” item.
3) Make a note of the value for “NitroRef” before pressing Enter. The value should be
between 3700mV and 4050mV.
4) Press Enter (* appears next to the value)
5) Apply zero gas (Nitrogen) and wait until the reading stabilizes (at least within five
minutes).
6) If you obtain a similar reading to the original value for “NitroRef” continue with step
8). Check that the value is within the prescribed limits in step 3).
7) If the stabilized value is significantly lower than 3700mV, adjust the gain
potentiometer (VR1) clockwise to increase the gain. The ideal value to obtain is
3900mV (3850-3950mV). The range from 3700mV to 4050mV is acceptable if the
end of the range for VR1 is reached in either direction and it is not possible to set to
3900mV. The value must never be above 4050mV. If you see the value 4095mV, it
means the gain is too high and the value is in an unknown region. Turn VR1 anticlockwise to reduce the gain.
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8) When you are satisfied that the gain is good and the value is stable, press Enter (the
* will go off and the value will stop changing). It is normal for the value to fluctuate
up or down by up to 5mV.
9) Repeat if required, but keep the gas flowing throughout. Afterwards, perform a Zero
and Span Calibration, which is mandatory after doing a Gain Check. You can keep the
Nitrogen gas flowing to perform the Zero Calibration.
5.3 Zero Calibration
Follow the procedure below to perform a Zero Calibration:
1) Complete the calibration setup using a M-20 calibration kit.
2) Scroll through the menu (as described in the previous chapter) to the “Zero Cal”
item.
3) Apply zero gas (100% Nitrogen) and wait until the reading stabilizes (to be within five
minutes).
4) If the indicated concentration is 0ppm ± 25ppm, the Zero Calibration is fine and no
adjustment is necessary, proceed in such a case to the Span Calibration.
5) Press Enter (* appears next to value).
6) Press Up or Dn, the display will immediately adjust to 0000.
7) Repeat as necessary, preferably with the concentration between 0ppm and 50ppm.
Small negative concentrations are acceptable from –10ppm to –1ppm.
8) Press Enter to exit (* disappears).
9) Proceed to the Span Calibration.
5.4 Span Calibration
Follow the procedure below to perform a Span Calibration:
1) Complete the calibration setup using a M-20 calibration kit.
2) Scroll through the menu (as described in the previous chapter) to the “Span Cal”
item.
3) Apply span gas (2500ppm CO2, balance Nitrogen) and wait until the reading stabilizes
(to be within five minutes).
4) If the indicated concentration is 2500ppm ± 25ppm, the Span Calibration is fine and
no adjustment is necessary, proceed in such a case to the “Exit” menu item and save
your changes.
5) Press Enter (* appears next to value).
6) Press Up or Dn, the displayed concentration will adjust with each key press to a
higher or lower value.
7) Repeat as necessary, preferably until the concentration is between 2450ppm and
2550ppm. As you reach 2500ppm, reduce the number of key presses to one per
measurement cycle (every 10 seconds). When the displayed concentration is stable
(ideally 2500ppm ± 25ppm) proceed to step 8) below.
8) Press Enter to exit (* disappears).
9) Proceed to the “Exit” menu item and save your changes.
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6. Troubleshooting
The microprocessor will detect various component faults and out-of-range conditions, should
they occur during normal operation.
When a fault is detected, the output signal is dropped to 0.0 mA (or 0.0V) and the fault
indicated on the LCD.
Most gradually developing conditions such as a failing IR source lamp, dirt in the sample
chamber, etc., cause gradually rising readings; these mimic light absorption by CO2. Periodic
calibration checks are therefore required to ensure that the unit operates properly. The
frequency of calibration checks depends on the amount of dirt and dust in the environment
and can be determined by trial of one or more units in a new installation.
The typical life cycle of the IR source may see a gradually rising signal over a few months. In
ordinary service, one should expect many years of operation. For duct mount units, the filter
should be inspected periodically, depending on the amount of dust in the duct system.
NOTE: When the menu system is entered, the signal output defaults to the signal setting for
“Sig From”. The relay will be defaulted to off.
6.1 Troubleshooting Tips
Problem
LCD blank, Relay LED off.
After power-up, the unit
displayed “Defaults Loaded”.
LCD shows row of blocks.
Unit freezes, or restarts all
the time.
I am watching the unit and
the concentration keeps
jumping around.
Not possible to perform an
accurate span calibration.
Unit lost its sensitivity to gas.
Relay does not want to
operate.
Relay keeps switching on and
off all the time.
Signal goes the wrong way.
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Suggested Course Of Action
Check power availability.
Check fuse F1.
Check for proper connection to TB4.
The microprocessor detected invalid parameters in the
EEPROM and reverted to default settings.
If equipment and a calibration kit is available, perform these
calibration operations: “NitroRef”, “Zero Cal”, “Span Cal” and
“Sig Cal”.
Alternatively, return the unit to the factory for factory
calibration.
Microprocessor failure. Check for moisture on circuit card.
Check for power voltage within specification.
Humans exhale several thousand ppm CO2, keep a distance
from the unit.
The sensor chamber is most likely contaminated or the IR
lamp aged too much.
Return the unit to the factory for a replacement block.
Attempt to clear the sensing chamber with canned air if lint
or particles can be seen through the gas ports. Consider
cleaning a temporary solution.
Find a solution to prevent contamination.
Check for contamination of the measuring chamber by dust
or lint particles.
Do a calibration check.
Check if relay enabled in the menu system.
Check relay set points, time delays and dead band.
Check dead band (difference between “Relay On” and “Relay
Off”) to be more than 50ppm.
Increase dead band.
Increase “Delay On” or “Delay Off”, or both.
The “Sig From” and “Sig To” settings are swapped.
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Problem
Signal not showing the
correct amount of mA.
Signal supposed to give
2-10V, but is pinned high
above 10V.
Signal output gives weird
response.
Signal output jumpy.
Signal output does not
respond enough.
Current output jumper set
correctly but output is pinned
high.
The signal output is dropping
below 2mA and I am getting
a fault indication from the
monitor.
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Suggested Course Of Action
Check if J3 not set for voltage output.
Check if burden resistor not too high.
Check if J3 not set for current output.
Check to “Sig From” and “Sig To” settings. Increase the
difference between the two points.
Increase difference between “From ppm” and “To ppm”.
Check to “Sig From” and “Sig To” settings. Decrease the
difference between the two points.
Change the difference between “From ppm” and “To ppm”.
Check the burden resistor of the monitor. Check cable to the
monitor.
The 0-10V or 0-20mA mode is enabled. Go to the “JumperJ3”
menu item and select “RightMA”. Check the signal end-point
settings.
Check to see if the unit is not showing a fault condition.
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6.2 Fault Codes
Should the unit detect an internal fault, it is categorized and the fault is indicated by a fault
code. A fault code will be shown for five seconds, after which the unit will attempt to recover
to normal operation. A unit experiencing a fault can be identified by the fault indication on the
LCD display or by the signal output line dropping to 0.0mA (or 0.0V) periodically.
Should any fault occur, check the circuit card for moisture condensation or for water dripping
into the enclosure. Check the supply voltage to be within specification over an 11 second
period.
If the fault cannot be repaired by the suggested remedy, please contact the factory or
distributor.
Fault Code
01
Description
Lamp Failure
02
Software Error
03
04
Lamp State Error
Math Overflow
05
Thermopile Failure
06
Thermistor Stuck Low
07
Thermistor Stuck High
08
EEPROM Communication Fault
09
EEPROM Verify Fault
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Remedy
Check for excessive dust in chamber.
Return unit to factory for replacement
block.
Remove power for 10 seconds to reset
microprocessor. Please notify factory and
provide the software version and revision
number, as well as unit serial number.
As for Fault 02.
Check Zero and Span Calibration. Check
signal output settings, especially “Sig
From” and “Sig To”. If calibration and
signal settings are fine, notify factory.
Check for moisture on the circuit card.
Return unit to factory for replacement
block.
Check for moisture on the circuit card.
Check if ambient operating temperature
falls within specification. Return unit to
factory repair.
Check for moisture on the circuit card.
Check if ambient operating temperature
falls within specification. Return unit to
factory repair.
Check for moisture on the circuit card.
Return unit to factory for repair.
Verify settings and calibration, save on
Exit. Return to factory for repair if fault
persists.
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7. Duct Mount Adapter (CTS-M2000X-D00000)
The Duct Adapter enables the M-20 to be used for monitoring moving air inside ducting.
Screw in the two hose barbs supplied with the Duct Adapter and mount the adapter as
shown.
NOTE: Check the required direction of the airflow. Error in mounting will cause dust to
be forced into the sensing chamber. The inlet air must pass through the
particulate filter before entering the unit.
QEL
CO2
QU AT RO SEN SE
EN VIR ON MEN T AL
L IMIT ED
M-20
Figure 3 - Duct Mount Configuration
Figure 4 - Duct Cutout
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8. Wiring and Power Supply
The M-20 Power Supply input is isolated internally from the electronics. This allows it to be
connected to all possible power and signal grounding configurations without compromising
performance.
In the following diagrams, G1 is an internal signal ground for the monitor. It may or may not
be common with the power supply ground. G2 indicates a ground, which is not common to
the monitor, which the installer can leave unconnected to avoid ground loops.
Figure 5 - 24VAC Floating Supply (4-Wire Installation)
Figure 6 - 24 VAC with Separate Grounds (4-Wire Installation)
Figure 7 - 24VAC with Common Grounds (3-Wire Installation)
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Figure 8 - 24VDC Supply with Common Ground (3-Wire Installation)
Figure 9 - 24VDC Supply with Separate Ground (4-Wire Installation)
Figure 10 - 24VDC Ungrounded Supply (4-Wire Installation)
Figure 11 - 24VDC Ungrounded Supply (3-Wire Installation)
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WARRANTY STATEMENT
The information contained in this manual is based upon data considered accurate; however,
no warranty is expressed or implied regarding the accuracy of this data. All QEL equipment is
warranted against defects in material and workmanship for a period of two years from date of
shipment with the following exceptions:
Electrochemical Sensors (Toxic)
Catalytic Sensors (Combustible)
Six Months
One Year
During the warranty period, we will repair or replace, at our discretion, any components or
complete units that prove, in our opinion, to be defective. We are not liable for consequential
or incidental damage to auxiliary interfaced equipment.
A returned material authorization number should be obtained from the factory prior to
returning any goods. All return shipments must be shipped freight prepaid and a copy of the
maintenance records should accompany the unit concerned.
Warranty should be considered F.O.B. the factory. Labour and travel time are chargeable for
any field site visits required for warranty work.
LIMITED LIABILITY
All QEL systems shall be installed by a qualified technician/electrician and maintained in strict
accordance with data provided for individual systems in the form of installation/maintenance
manuals. QEL assumes no responsibility for improper installation, maintenance, etc., and
stresses the importance of reading all manuals. QEL shall not be responsible for any liability
arising from auxiliary interfaced equipment nor any damage resulting from the installation or
operation of this equipment.
QEL’s total liability is contained as above with no other liability expressed or implied as the
purchaser is entirely responsible for installation and maintenance of systems.
This warranty is in lieu of all other warranties, expressed or implied, and no representative or
person is authorized to represent or assume for QEL any liability in connection with the sales
of our products other than that set forth herein.
NOTE:
Due to on-going product development, QEL reserves the right to change
specifications without notice and will assume no responsibility for any
costs as a result of modifications.
For further information or assistance, contact:
QUATROSENSE ENVIRONMENTAL LTD.
5935 Ottawa Street, PO Box 749
Richmond, Ontario
K0A 2Z0
Tel: (613) 838-4005
Fax: (613) 838-4018
Email: QEL@QELsafety.com
Web: www.QELsafety.com
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