GasTech GTF220 User manual

Wall-mount type of Carbon Dioxide Detector
Model: GTF220
GASTECH is a professional manufacturer in various gas detectors, carbon monoxide detector, carbon dioxide detector,
oxygen detector, odor detector, VOC detector, hydrogen sulfide detector and carbon monoxide detector. Welcome tour
our website www.gastech.com.tw 1
Installation and Wiring
1. Please read the Security Notifications in detail firstly.
2. The gas detector might install on wall or steel plate, please refer following drawing to make marking then drill
the holes. Do not use the gas detector as a drilling template to avoid fault.
3. Due to the space is very small that is impossible to use wrench. Therefore, to use female expansion bolts on the
wall or tap female screws on the steel plate and use external screw (male bolts) that can use the screw driver to
install the gas detector and solve spacing problems. M6 sizes of bolts have a good tolerance than W1/4.

Wall-mount type of Carbon Dioxide Detector
Model: GTF220
GASTECH is a professional manufacturer in various gas detectors, carbon monoxide detector, carbon dioxide detector,
oxygen detector, odor detector, VOC detector, hydrogen sulfide detector and carbon monoxide detector. Welcome tour
our website www.gastech.com.tw 2
4. Analog output
A recommend fuse is 0.2 A in the above.
5. Relay output
A recommend fuse is 0.2 A, the diode could be 1N4002 or 1N4004 in the above.
6. In order to meet waterproof, the wiring material and parts should be met the requirement also.
7. The wiring size is not less 0.5 mm^2 or 20 AWG. In the case of long-distance wiring, to apply bigger size or 30
VDC power is better.
8. The detector attached wiring connectors and shrink sleeves for the wiring. Due to spacing problems, do not use

Wall-mount type of Carbon Dioxide Detector
Model: GTF220
GASTECH is a professional manufacturer in various gas detectors, carbon monoxide detector, carbon dioxide detector,
oxygen detector, odor detector, VOC detector, hydrogen sulfide detector and carbon monoxide detector. Welcome tour
our website www.gastech.com.tw 3
electrical tape. For the connecting the wires, to solder them is better than using connectors that do not cut wires
while replace or reinstall to avoid shortage of wires length.
9. There are two 1/2” NPT female connectors which might use one normally. Please blind the other with tape seal.
Specifications (Specification maybe changed without notice)
model GTF220-A GTF220-R
type wall-mount
sensor solid electrolyte
target carbon dioxide
sampling method diffusion
measuring range 350 ~ 8,000ppm
resolution/accuracy / sampling time 1 ppm / ±5％F.S. (350 ~ 5,000ppm) / continuity
alarm level high alarm resetable
analog output 4 ∼20 mA
max. load resistance 500 ohm N/A
relay output
rating N/A single pole normal open relay
with self-hold function
30VDC, 1A
buzzer / flash lamp available
backlight alphanumeric LCD available
construction dustproof and waterproof ( meet to IP65)
size 193 mm x 91 mm x 40 mm
net weight about 700 g
power supply 24 ~ 30 VDC
power consumption about 3W
ambience temperature 0 ~ 45 degree in Celsius
ambience humidity less 95％RH and non-condenser
packing size about 208 mm x 156 mm x 68 mm
gross weight about 1,100 g

Wall-mount type of Carbon Dioxide Detector
Model: GTF220
GASTECH is a professional manufacturer in various gas detectors, carbon monoxide detector, carbon dioxide detector,
oxygen detector, odor detector, VOC detector, hydrogen sulfide detector and carbon monoxide detector. Welcome tour
our website www.gastech.com.tw 4
MODEL…A03
GTF220-A
1. Power on display
After power on, the GTF220 carbon dioxide detector will display a series of messages, including welcome, model
no and carbon dioxide concentration in ppm.
WELCOME
Show the model no. (Show it at power on only.)
GTF220-A is a standard type with 4 ~ 20 mA analog output.
GTF220-R is an optional type with relay output.
It’s warming up now, please wait. (Show it at power on only.)
Show the concentration of carbon dioxide.
The measuring range would be 350 ppm to 8,000 ppm. It may shows >8,000 ppm while
concentration of carbon dioxide is higher than above range.
2. Settings
The following operating procedure describes the settings. In the operation, press NEXT key or idle 3 minutes, the
display will back to the concentration of carbon dioxide.
In the display, press NEXT key to enter next function.
In the display, press ADJ key, the buzzer and flash lamp will action. PressADJ key again,
they will stop. (The relay will make action in TESTALARM also, if detector model has
relay output.)
Press NEXT key to enter next function.
In the display, press ADJ key, to reset the buzzer high limit. The last words of last row
might show UP, press ADJ key will increase the setting limit. Press UPDN key, the word
will change to DN; pressADJ key will decrease the setting limit.
Press NEXT key to enter next function.
In the display, press ADJ key, to reset the buzzer low limit. The last words of last row might
show UP, press ADJ key will increase the setting limit. Press UPDN key, the word will
change to DN; pressADJ key will decrease the setting limit.
Press NEXT key to enter next function.
GASTECH
WELCOME
WARMING-UP
WAIT….
CO2 364 ppm
TESTALARM
Buzzer H. L.
3500 ppm UP
CO2 364 ppm
Buzzer L. L.
350 ppm UP

Wall-mount type of Carbon Dioxide Detector
Model: GTF220
GASTECH is a professional manufacturer in various gas detectors, carbon monoxide detector, carbon dioxide detector,
oxygen detector, odor detector, VOC detector, hydrogen sulfide detector and carbon monoxide detector. Welcome tour
our website www.gastech.com.tw 5
In the display, press ADJ key, to reset the flash high limit. The last words of last row might
show UP, press ADJ key will increase the setting limit. Press UPDN key, the word will
change to DN; pressADJ key will decrease the setting limit.
Press NEXT key to enter next function.
In the display, press ADJ key, to reset the flash low limit. The last words of last row might
show UP, press ADJ key will increase the setting limit. Press UPDN key, the word will
change to DN; pressADJ key will decrease the setting limit.
Press NEXT key to enter next function.
In the display, press ADJ key, to reset the relay action limit. The last words of last row
might show UP, press ADJ key will increase the setting limit. Press UPDN key, the word
will change to DN; pressADJ key will decrease the setting limit.
Note: this function is available in relay output model only.
Press NEXT key to enter next function.
In the display, press ADJ key, to reset the relay release limit. The last words of last row
might show UP, press ADJ key will increase the setting limit. Press UPDN key, the word
will change to DN; pressADJ key will decrease the setting limit.
Note: this function is available in relay output model only.
Press NEXT key to enter next function.
In the display, if press UPDN and ADJ key at the same time, the detector will execute
calibration function. The calibration will take 10 minutes in the period time; here the
detectors will access the lowest detecting value to make a basis of 350 ppm of carbon
dioxide. In order to get good basis and to avoid the breath affect consequence, the operators
have to leave and come back again after 10 minutes. It is necessary to provide a fresh air
condition while the period time; if not, user have to prepare the standard air (CO2=350ppm,
O2=21 vol.% and N2=79 vol.%).After completing calibration, the display will back to the
concentration of carbon dioxide.
Press NEXT key to jump calibration function and enter next function.
Warning! Except necessary, do not execute calibration. It is necessary to execute calibration
after power on 7 days.An error operating should loss accuracy.
In the display, press UPDN and ADJ keys at same time, to enter calibration function.
Before the calibration, user needs prepare an ampere meter and makes series into analog
current loop.
Press NEXT key to jump calibration function and enter next function.
Warning! Except necessary, do not execute calibration. It is necessary to execute calibration
after power on 24 hr. An error operating should loss accuracy.
Note: this function is available in analog output model only.
In the display, user has to finish calibration.
The last words of last row might show UP, press ADJ key will increase the
current output. Press UPDN key, the word will change to DN; pressADJ key
will decrease the current output.
Press NEXT key to finish calibration of 4 mA and enter next function.
C. Dioxide
Cal. Zero?
<UPDN> + <ADJ>
Calibration
4 mA UP
Analog Output
Calibration ?
<UPDN> + <ADJ>
Relay A. L.
950 ppm UP
Relay R. L.
800 ppm UP
Flash L. L.
350 ppm UP
Flash H. L.
1100 ppm UP

Wall-mount type of Carbon Dioxide Detector
Model: GTF220
GASTECH is a professional manufacturer in various gas detectors, carbon monoxide detector, carbon dioxide detector,
oxygen detector, odor detector, VOC detector, hydrogen sulfide detector and carbon monoxide detector. Welcome tour
our website www.gastech.com.tw 6
In the display, user has to finish calibration.
The last words of last row might show UP, press ADJ key will increase the
current output. Press UPDN key, the word will change to DN; pressADJ key
will decrease the current output.
Press NEXT key to finish calibration of 20 mA and enter next function.
In the display, user can read out the used life time of detector. Normally, the sensor of
detector has 1,000 days life time. It is necessary to renew the sensor beyond that.
Note 1: due to QC procedure, the used life time might be more than 1 day, but it should be
less than 30 days.
Note 2: Life time meter count up during power on only. If the detector is idle for a long
time, or used in an environment with high concentration of carbon dioxide, frequentative
power on and off, the lifetime will be shortened even the meter less than 1,000 days.
Press NEXT key; the display will back to the concentration of carbon dioxide.
3. Alarm message
The concentration of gas is higher than the buzzer high limit, the detector not only has audible alarm but also
provide clear alphanumeric alarm message for users.
If the concentration of carbon dioxide is higher than the buzzer high limit, the detector will
show this display. If the concentration of carbon dioxide is over 8,000 ppm will show
>8,000 ppm.
Press NEXT key, the buzzer will mute and the display will back to the concentration of
carbon dioxide. If the concentration of carbon dioxide is still higher than buzzer high limit,
this message and audible alarm will come again after 30 seconds that will disappear until
the concentration of carbon dioxide is lower than the buzzer high limit.
If the concentration of carbon dioxide is lower than the buzzer low limit, the detector will
show this display.
Press NEXT key, the buzzer will mute and the display will back to the concentration of
carbon dioxide. If the concentration of carbon dioxide is still lower than buzzer low limit,
this message and audible alarm will come again, that will disappear until the concentration
of carbon dioxide is higher than the buzzer low limit.
4. Warning message
The GTF220 carbon dioxide detector may auto-off under low or high specified voltage. If the gas detector is
auto-off, it cannot work for detection. At some of case, the detector cannot work but will provide warning message
which reminds user to check the detector or its system.
Due to input voltage lower than specified, the detector cannot work.
Due to ambience temperature higher than specified, the detector cannot work.
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GASTECH reserves the right to improve any product described in this operation manual without prior notice.
High Alar
m
CO2 1368 ppm
Life Time
29 DAYS
Temp. High
Calibration
20 mA UP
Power Low
Low Alar
m
CO2 600 ppm