Introduction
Congratulations on your purchase of the Model GSM220 Carbon Dioxide Monitor and Datalogger. The GSM220 measures, displays, and logs CO2 level, air temperature, relative humidity, date, and time. The included Windows-based software and USB cable allow you to set up the datalogger and transfer logged data to your PC. The GSM220 is an ideal instrument for indoor air quality (IAQ) monitoring.
Description
METER DESCRIPTION
- 1. LCD Multifunction display
- 2. Power LED indicator (blinks while datalogging)
- 3. Control buttons
The meter also features a power adaptor jack, USB port, and sensors on the back.
LCD DESCRIPTION
- 1. CO2 concentration in ppm
- 2. Date and Time
- 3. Air Temperature
- 4. % Relative Humidity
FUNCTION INDICATORS
- ppm: CO2 measurement units
- GOOD/NORMAL/POOR: CO2 air quality levels
- Air Temp: Air Temperature
- °C or °F: Temperature units
- MIN/MAX: Minimum and Maximum readings
- A fan icon 🎂 flashes when the CO2 alarm triggers.
CONTROL BUTTONS
- SET: Long press to enter setup mode. Saves settings.
- ESC: Exits setup page/mode. Stops the datalogger. Aborts calibration.
- RESET: Long press to clear the MIN/MAX memories.
- LOG ▲: Start Datalogger. Select a mode or increase a value in the setup menu.
- MIN/MAX ▼: Access MIN/MAX function. Use as down-arrow in setup mode. Long press SET/function indicator to enter the CO2 calibration.
Operation
Powering the GSM220
Plug the supplied power adaptor (5V/0.5A) into the power jack on the back of the meter and connect to an AC power source. The meter will switch ON. The front panel LED power indicator will light, and the beeper will sound. If the power source voltage is incorrect, 'bAt' will display, and the LED indicator will flash. Do not use the GSM220 with an incorrect power source.
In normal operation, the LCD will display CO2, temperature, humidity, date, and time. The air quality level is also displayed (GOOD, NORMAL, or POOR).
Measurements
The GSM220 starts measuring as soon as it is powered and updates readings once per second. If the operating environment changes (from high to low temperature, for example), it will require 2 minutes for the CO2 sensor to respond and 10 minutes for the humidity sensor to respond. Do not hold the meter close to your mouth or any other source of CO2.
MIN/MAX Mode
In the normal mode, press the MIN/MAX button to see the minimum or the maximum CO2, Temperature, and Humidity values. Each press of the MIN/MAX button steps through the MIN, the MAX, and then the normal display mode. Long press the RESET button to clear the minimum and maximum values from memory.
Data Logging
The GSM220 logs CO2, air temperature, and relative humidity readings (along with date and time). The memory capacity is 15999 points (5,333 CO2, temperature, and humidity records). The sample rate is adjustable (in the setup mode) from 1 second to 4 hours, 59 minutes, 59 seconds.
After setting the sampling rate, long press the LOG button to start logging. The green LED blinks while logging, and the main display digits alternate between real-time CO2 readings and the abbreviation 'rEC' (record). The lower displays show the real-time temperature, humidity, date, and time.
To stop logging, long press the ESC button. The LED stops blinking, and the main display will alternate between real-time CO2 readings and the word 'End'. Long press the ESC button again to return to the normal operating mode. See the PC Datalogger Software section for details on downloading logged readings to a PC.
Note that the MIN/MAX memory is still operational during data logging and is cleared each time a logging session is started.
PC Datalogger Software
The supplied Windows-based PC software and USB cable allow you to set up the datalogger, download logged data, and view the logged data graphically or in text format on a PC. The software and USB driver are also available from the Extech website.
Connect the GSM220 to a PC using the supplied USB cable. The USB port is located on the back of the GSM220. Install the software, open it, and refer to the program HELP utility for complete operational information. Contact Extech support if you have questions or problems.
Alarm Function
The GSM220 features an audible (beeper) and visual (flashing fan icon 🎂) alarm that warns when the CO2 concentration exceeds the programmed threshold. There are two alarm thresholds: the 'POOR' air quality threshold (that triggers the alarm), and the 'NORMAL' air quality threshold (that cancels the alarm). See the Setup mode to set these threshold settings.
The audible alarm can be manually silenced by pressing any key, or it will automatically stop when the CO2 reading is no longer in the alarm region (the user can subsequently press and hold the RESET button to re-activate the alarm, if desired).
If the beeper is manually silenced, it will sound again when readings move out of, and then back into, the alarm region. The fan icon continues to flash even when the beeper is manually silenced. It disappears only when readings are no longer in the alarm region.
Setup Mode
Long press the SET button to enter the setup mode.
P1.1: Threshold setting for the 'GOOD' air quality display icon
When entering the setup mode, P1.0 and 'CO2' are displayed. Press the SET button again to access P1.1 for setting the CO2 upper limit (threshold) for the 'GOOD' air quality display icon. The current set value will appear blinking on the display.
Press the ▲ or ▼ button to increase or decrease the value. Each press adjusts in 100 ppm increments. The range is 0 to 700 ppm (default is 700 ppm).
When the value has been set, press the SET button to confirm the 'GOOD' threshold and move to P1.2 for setting the 'NORMAL' display threshold. Press the ESC button to exit without saving.
P1.2: Threshold setting for the 'NORMAL' air quality icon and the CO2 Alarm
P1.2 is used for setting the CO2 high threshold for the 'NORMAL' air quality display icon. It is also the low threshold for the alarm beeper and the flashing fan alarm icon. The current set value will appear blinking on the display.
Press the ▲ or ▼ button to increase or decrease the value. Each press adjusts in 100 ppm increments. The range is 700 to 1000 ppm (default is 1000 ppm).
When the value has been set, press the SET button to confirm the 'NORMAL' limit and move to P1.3 for setting the 'POOR' display threshold. Press the ESC button to exit without saving.
P1.3: Threshold setting for the 'POOR' air quality icon and CO2 Alarm
P1.3 is used for setting the high CO2 threshold for the 'POOR' air quality display icon, alarm beeper, and flashing fan icon. The current set value will appear blinking on the display.
Press the ▲ or ▼ button to increase or decrease the threshold. Each press adjusts in 100 ppm increments. The range is 1000 to 5000 ppm (default is 1000 ppm).
When the value has been set, press the SET button to confirm and move to P1.4. Press SET again to continue. Press ESC to exit without saving.
Settings
Caution: Set the alarm value within the specified range of the GSM220 where accuracy is assured. Out-of-specification readings are for reference only.
P2.0 Temperature Units
Press the ▲ button in P1.0 mode to access P2.0 for setting the temperature display units. Press the SET button to access the P2.1 setting mode. The °C or °F will blink (default is °C).
Press the ▲ button to change the units. Press the SET button to confirm the setting or press the ESC button to exit without saving and return to P1.0.
P3.0 Real-Time Calendar Clock
Press the ▲ button in P1.0 twice to access P3.0 for setting the real-time calendar clock. Press the SET button and the meter will access P3.1, showing the blinking YEAR on the lower left. To change the year, press the ▲ or ▼ button. Press the SET button to save the setting and move to P3.2 (or press the ESC button to return to P3.0 without saving).
Press the ▲ button from P3.1 to access P3.2. The current MONTH setting will blink. To change the month, press the ▲ or ▼ button. Press the SET button to save the setting and move to P3.3 (or press the ESC button to return to P3.0 without saving).
Press the ▲ button from P3.2 to access P3.3. The current DATE (day) setting will blink. To change the day, press the ▲ or ▼ button. Press the SET button to save the setting and move to P3.4 (or press the ESC button to return to P3.0 without saving).
Press the ▲ button from P3.3 to access P3.4. The current 12/24-hour clock setting will blink. To change it, press the ▲ or ▼ button. Press the SET button to save the setting and move to P3.5 (or press the ESC button to return to P3.0 without saving).
Repeat as above to finish setting P3.5 (HOURS) and P3.6 (MINUTES).
P4.0: Factory Default Reset
Press the ▲ button in P1.0 three times to access P4.0 where you can reset the meter to its default settings. Press SET and the meter will access P4.1 with a blinking "No". Press the ▲ to switch the status to 'Yes' and then press either the SET button to confirm and continue or the ESC button to abort the process.
Calibration
The meter is calibrated to a 400ppm CO2 concentration at the factory. If the accuracy becomes a concern, or after one year of use, return the meter to Extech for calibration or continue below.
ABC (Automatic Baseline CO2 Calibration)
ABC (Automatic Baseline Calibration) establishes a baseline calibration to eliminate the zero drift of the infrared sensor. The ABC function is always "ON" when the meter is powered.
ABC is designed to calibrate the meter at the minimum CO2 reading detected over 7.5 days of continuous monitoring (power on). It assumes that the area being tested receives fresh air with a CO2 level of approximately 400ppm at some point during the monitoring period. Note that it is not suitable to use the GSM220 in closed areas with consistently high CO2 levels 24 hours a day.
Manual CO2 Calibration
Manual calibration is suggested to be done outdoors on a clear day with good ventilation and fresh air where the CO2 level is approximately 400 ppm. Do not calibrate on a rainy day because high humidity will affect the CO2 level in air.
CAUTION: Do not calibrate the meter in an atmosphere of unknown CO2 concentration. Do not calibrate in places crowded with people, pets, plants, or where high CO2 concentrations may exist such as near ventilation ducts or fireplaces.
Place the meter in the calibration area and switch it on. Press and hold the SET, ▲, and ▼ buttons simultaneously for > 1 second to enter CO2 calibration mode. "400ppm" and "CO2" will blink while the calibration is in process.
The calibration will require approximately five (5) minutes. When the calibration is complete, the blinking stops and the meter returns to the normal operating mode. Press ESC to abort a calibration session (not recommended).
Specifications
| Function | Range | Resolution | Accuracy |
|---|---|---|---|
| CO2 | 0 to 9999ppm | 1ppm | ± (5%rdg + 50ppm) |
| Temperature | -10 to 60°C (14 to 140°F) | 0.1° | ± 0.6°C (0.9°F) |
| Humidity | 0.1 to 99.9% | 0.1% | ± 3% (10 to 90%) ± 5% (< 10% or > 90%) |
Display
Multi-function LCD
Sensor Type
- CO2: NDIR (non-dispersive infrared) technology
- Humidity: Capacitance sensor
- Temperature (air): Thermistor
Response
- CO2: < 2min for 90% step change
- Air temperature: < 2min for 90% step change
- RH: < 10min for 90% step change
Datalogger
15999 total samples (5,333 readings each for CO2, air temperature, and relative humidity). To download logged readings, use the latest Windows-based PC software and USB driver from Triplett Product Software — Triplett Test Equipment & Tools. USB cable is included with the GSM220.
Operating Conditions
14 to 140°F (-10 to 60°C); < 90% RH non-condensing.
Storage Conditions
-4 to 140°F (-20 to 60°C); <99% RH non-condensing.
Power Supply
5VDC (±10%), ≥ 500mA (supplied adaptor).
Dimensions
4.6 x 4 x 4" (117 x 102 x 102 mm).
Weight
7.2 oz (204 g).
Maintenance
Cleaning and storage
- The meter should be wiped with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives.
- Store the meter in an area with moderate temperature and humidity.
Troubleshooting
Error Display Codes
CO2 Display Code
| Code | Description | Action |
|---|---|---|
| E01 | CO2 sensor malfunction. | Return for repair. |
| E02 | CO2 reading out of range (low). | Re-calibrate the meter. If problems persist, return for repair. |
| E03 | CO2 reading out of range (high). | Place the meter in fresh air and allow 5 minutes. If problem persists, re-calibrate the meter. Return for service if necessary. |
| E17 | CO2 sensor failure. | Return for repair. |
Temperature Display Code
| Code | Description | Action |
|---|---|---|
| E02 | Air temperature out of range (low). | Place the meter at room temperature for 30 minutes. If problem persists, return for repair. |
| E03 | Air temperature out of range (high). | Same as E02. |
| E31 | Sensor malfunction. | Return for repair. |
Humidity Display Code
| Code | Description | Action |
|---|---|---|
| E04 | Temperature display shows error. | Refer to temperature error codes. |
| E11 | RH calibration failure. | Please return for repair. |
| E34 | RH sensor circuit failure. | Please return for repair. |
CO2 Level Guidelines
Important: The public information provided below is offered for reference only.
- 250 - 350 ppm: Normal background outdoor levels.
- 350 - 1,000 ppm: Typical level found in occupied spaces with good air exchange.
- 1,000 - 2,000 ppm: Level associated with complaints of drowsiness and poor air.
- 2,000 - 5,000 ppm: Level associated with headaches, sleepiness, and stagnant, stale, or stuffy air. Poor concentration, loss of attention, increased heart rate and slight nausea may also be present.
- >5,000 ppm: Exposure may lead to serious oxygen deprivation resulting in permanent brain damage, coma, and death.
Regulatory exposure limits:
- ASHRAE Standard 62-1989 (1000ppm): CO2 concentration in occupied building should not exceed 1000ppm.
- OSHA (5000ppm): Time weighted average over five 8-hour workdays should not exceed 5000ppm.
- Building bulletin 101 (Bb101) 1500ppm: UK standards for schools indicate that CO2, averaged over an entire day (i.e. 9am to 3:30 pm), should not exceed 1500ppm.
- Germany, Japan, Australia, UK (5000ppm): 8-hour weighted average occupational exposure limit is 5000ppm.
Warranty
Triplett / Jewell Instruments extends the following warranty to the original purchaser of these goods for use. Triplett warrants to the original purchaser for use that the products sold by it will be free from defects in workmanship and material for a period of (1) one year from the date of purchase. This warranty does not apply to any of our products which have been repaired or altered by unauthorized persons in any way or purchased from unauthorized distributors so as, in our sole judgment, to injure their stability or reliability, or which have been subject to misuse, abuse, misapplication, negligence, accident or which have had the serial numbers altered, defaced, or removed.
Accessories, including batteries, are not covered by this warranty.
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