Triplett GSM450 User manual

User Manual

GSM450

CO/CO2 Meter with RH% and Temperature

Introduction

Thank you for selecting the Triplett GSM450 Meter. The GSM450

measures CO2 (Carbon Dioxide) levels, CO (Carbon Monoxide) levels,

air temperature, and relative humidity. The GSM450 also displays dew

point and wet bulb temperatures, generated from calculations performed

on temperature and humidity measurements. The GSM450 is an ideal

instrument for indoor air quality (IAQ) analysi

Features

Adjustable carbon monoxide warning level

Designed with NDIR (non-dispersive infrared)

Long life electrochemical sensor

Audible and visual alarm

Backlit LCD for easy viewing in dimly lit areas

Low battery indicator

Auto power off

Mini USB connector

Manual and automatic recording

Safety Information

IMPORTANT CARBON MONOXIDE (CO) SAFETY NOTES

1. The GSM450 Carbon Monoxide Monitor is intended for general

purpose Air Quality monitoring only, and has not been certified for use

pursuant to any state or city safety Carbon Monoxide Alarm or

Monitoring requirements.

2. The GSM450 Carbon Monoxide Monitor has not been tested by an

independent lab to comply with the UL 2034 or IAS 6-96 standard.

3. It is the responsibility of the customer to obtain and apply current

local, state, and national regulations with regard to CO alarms,

monitoring and testing.

4. Electromagnetic (EMI) interference my cause erratic meter readings;

do not place meter near areas of high EMI when taking CO

measurements.

5. Recovery time is required after the meter has been exposed to high

levels of CO; the longer the exposure, the longer the recovery time.

Carbon monoxide is life threatening even at relatively

low concentrations; learn and recognize the effects of

CO poisoning (see Table below). Do not use this meter

as a personal safety-monitoring device

Effects of Carbon Monoxide (CO) poisoning

Warning: Ensure that the meter is powered, at room temperature,

and in an area free of Carbon Monoxide (CO) before starting

measurements. If not, the meter will read incorrectly when

subsequently measuring CO.

0-1 PPM

Normal background levels

9 PPM

Maximum allowable short term exposure

50 PPM

Maximum allowable continuous exposure level in any

8-hour

period, according to OSHA

200 PPM

Mild headache, fatigue, nausea and dizziness after 2-

3 hours

400 PPM

Frontal headache with 1-2 hours, life threatening

after 3 hours

800 PPM

Dizziness, nausea, convulsions within 45 minutes.

Unconsciousness

within 2 hours. DEATH WITHIN 2 TO 3 HOURS

1600 PPM

Headache, dizziness, nausea within 20 minutes,

DEATH WITHIN 1

HOUR

3200 PPM

Headache, dizziness, nausea within 5-10 minutes.

DEATH WITHIN

25-30 MINUTES

6400 PPM

Headache, dizziness, nausea within 1-2 minutes.

DEATH WITHIN

10-15 MINUTES

12800 PPM

DEATH WITHIN 1 TO 3 MINUTES

Regulatory exposure limits for Carbon Dioxide (CO2)

ASHRAE Standard 62-1989: 1000ppm: CO2 concentration in

occupied building should not exceed 1000ppm.

OSHA: 5000ppm: Time weighted average over five 8-hour

workday should not exceed 5000ppm.

Building bulletin 101 (BB101): 1500ppm. UK standards for schools

state that CO2 averaged over the whole day (i.e. 9:00am to 3:30

pm) should not exceed 1500ppm.

Germany, Japan, Australia, UK: 5000ppm, 8 hours weighted average

in occupational exposure limit is 5000ppm.

EPA Taiwan (Type 1): Indoor areas such as department stores,

theaters, restaurants, libraries have acceptable CO2 concentration of

1000ppm over an 8-hour average period.

EPA Taiwan (Type 2): Indoor areas with special requirements for

good air quality such as schools, hospitals, and day care centers

have suggested CO2 level of 600ppm

Description

METER

1. Temperature and Humidity sensor

2. Primary display

3. Secondary display

4. Power and Set button

5. Start and Escape button

6. Mode and Recall button

7. Min-Max-Avg and Enter button

8. Memory and Down button

9. CO and CO2 sensors (on rear of meter)

10. Hold and Up button

11. AC Adaptor and Micro USB ports

Battery compartment on rear of meter

LCD DISPLAY

CO2 Carbon dioxide

CO Carbon monoxide

TWA Time weighted average (8 hours)

STEL Short-term exposure limit (15 minutes weighted average)

HOLD Freezes current reading on display

MIN/MAX Minimum/Maximum readings

Low battery indicator

DP Dew point temperature

TA Air temperature

WBT Wet bulb temperature

%RH Relative humidity

C or F Celsius/Fahrenheit

CAL Calibration Mode

REC Manual/automatic data logging

RECALL View manually logged data

KEYPAD

Turns on and off the meter.

Enters setup mode while meter is off.

Sets as non-sleep mode with .

Exits setup/recall page.

Start automatic logging.

Press to switch displayed mode.

Long press to enter memory recall mode.

Freezes the current readings.

Selects unit or increases value in setup.

Cancels data hold function.

Press to manually record the reading.

Selects unit or decreases value in setup.

Activates MIN, MAX, TWA, STEL function. Saves and finishes

settings.

Battery Installation

1. Four (4) ‘AA’ batteries or an AC/DC adaptor powers the meter.

2. Install the batteries into the rear battery compartment observing

correct polarity.

3. When the adaptor is used, the batteries are disconnected

from the meter circuitry. The adaptor cannot be used to

charge rechargeable batteries.

4. When battery voltage is low, the battery symbol ( )

appears. Replace the batteries promptly.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate collection sites, the retail store

where the batteries were purchased, or wherever batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end-of-life devices

to a designated collection point for the disposal of electrical and electronic equipment.

Operation

Powering the Meter

Short press the /SET button to turn the meter ON or OFF. At

power up, the meter emits a short beep and performs a 30-second

warmup before entering normal operating mode. After the

countdown, the primary LCD will display the current readings. The

secondary display will alternate between the current date and time.

Taking Measurements

The meter begins measuring in the selected mode, when powered on,

and the sensor responds every 1 second. If the operating environment

changes (example: from high to low temperature), it requires 30

seconds for the CO2sensor to respond and up to 30 minutes for the

relative humidity sensor to respond.

Measuring Carbon Dioxide (CO2)

4. Short press the M/REL button to change the mode to CO2if

necessary.

5. To take a measurement, trace the GSM450 around the area of the

suspected leak.

6. The meter indicates the presence of carbon dioxide (CO2) in ppm

in the primary display. The secondary display indicates the current

date and time alternately.

NOTE: Do not hold the meter close to your mouth or any other source

of CO2.

Measuring Carbon Monoxide (CO)

1. Short press the M/REL button to change the mode to CO, if

necessary.

2. To take a measurement, trace the GSM450 around the area of the

suspected leak.

3. The meter indicates the presence of carbon monoxide (CO) in

ppm in the primary display. The secondary display indicates the

current date and time alternately.

4. The display will flash and an audible beeper sounds at 25 ppm

alerting the user to dangerous CO levels. The higher the

concentration of CO, the faster the beeper will sound. The

display will stop flashing once the measured CO is below the

alarm limit value.

Measuring Air Temperature and Calculating Dew point and

Wet bulb

1. Short press the M/REL button to change the mode to

air, dew point, or wet bulb temperature.

2. To take a measurement, trace the GSM450 in the testing area.

3. The primary display indicates the air temperature, dew point, or

wet bulb temperature depending on the selected mode. The

secondary display indicates the current date and time alternately.

4. Note that Dew Point and Wet Bulb Temperature displays are

calculations made from Air Temperature and Relative

Humidity measurements.

Measuring Relative Humidity %

1. Short press the M/REL button, if necessary, to change the mode to

Relative Humidity.

2. To take a measurement, place the GSM450 in the testing area.

3. The primary display indicates the relative humidity measurement

and the secondary display indicates the current date and time

alternately.

Advanced Functions

Data Hold

Short press the H/button to freeze the readings on the display. The

"HOLD” icon flashes in the top left of the display. Short press the H/button

again to unfreeze the readings on the display.

Note: the HOLD function is not operational in Min/Max/Avg mode.

Display Backlight

The meter is equipped with a backlight for easy viewing in dimly

lit areas. The backlight will activate for 10 seconds by pressing any

button.

MIN, MAX, STEL, TWA Recording

In normal operating mode, short press the MXMN/AV/button to

view the minimum, maximum, weighted average, and current

readings. With each short press of the MXMN/AV/button, the meter

displays the MIN, MAX, STEL, TWA, or current value along with elapsed

timer, in sequence. Short press the /ESC button to return to normal

operating mode.

In MIN and MAX modes, the meter shows the lowest (minimum) or

highest (maximum) reading in the primary display.

In STEL and TWA modes, the main display shows the weighted

average of readings for the past 15 minutes (STEL) or 8 hours (TWA).

TWA and STEL mode are only operational in CO2mode.

In CURRENT mode, the primary display shows the current readings. The

secondary display shows the elapsed timer. Press the /ESC button to

exit and return to normal operating mode.

NOTES:

1. If the meter is ON for < 15 minutes, the STEL value will be

the weighted average of readings taken since power on.

Similarly, for the TWA mode when the meter has been ON

for < 8 hours, the display only shows a weighted average of

the readings up to the moment.

2. The GSM450 requires at least 5 minutes calculating STEL and

TWA. The display shows “----” during the first 5 minutes from

power ON.

3. While in HOLD mode, the STEL and TWA values will continue to

update every 5 minutes.

4. Hold, Record, and Recall functions are not operational while in

Min/Max/Avg mode.

5. TWA and STEL will function only in CO2mode

6. The unit of measure can be changed while in Min/Max mode.

Manual Data Recording

The GSM450 has 99 memory locations for which to store readings one

at a time.

1. While in normal operating mode or hold mode, short press the

MEM/button to store a reading. The REC icon flashes on the

display for approximately 3 seconds. The primary display briefly

shows the memory location.

2. Each measurement parameter is saved, not just the currently

displayed parameter. (For example, when recording CO

readings, the CO2, %RH, and air temperature will also be

recorded).

3. Short press the H/button to freeze the readings on the

display before recording the data if the readings change too

quickly.

Note: The manual recording mode is not operational in Min/Max

mode.

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