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Measure / monitor ambient CO levels in home and office spaces. Visual and audible alarm indicates unsafe CO levels.

770 Carbon Monoxide Monitor

The 770 is a state of the art carbon monoxide instrument designed to measure CO in ambient air. This palm-sized unit displays readings in 1ppm increments.

  • Measure CO from O to 999ppm
  • Displays the max. CO reading in PPM since power on
  • Displays in hours and minutes, time elapsed since power on
  • Displays user set value of audible and visual alarm
  • The audible alarm can be switched on and off by pressing the SEL button

USA Suggested List Price
Digi-Key Electronics

The 770 CO Single Gas Monitor is a state-of- the-art Carbon Monoxide Instrument designed to measure Carbon Monoxide in ambient air and to perform a carbon monoxide build up test . It has a measurement range of 0 to 999 ppm (parts per million) and displays the readings in 1ppm increments.

The unit features a personal audible and visual alarm, which is factory set at 30ppm CO but can be changed in the field to keep current with government legislation.

Other features include: maximum reading hold, elapsed time and manual zero. The audible alarm may be switched on and off as required. Battery changing is made easy by use of a simple slide off battery compartment cover.

The detector uses an advanced electrochemical sensor that measures Carbon Monoxide and should not be used for any other purpose.

Note: This instrument meets the requirements of BS 7967

Calibration is required every 12 months.

Don’t expose yourself to Carbon Monoxide!

Review the list below for the maximum allowable exposure limits and symptoms developed with CO inhalation.

  • 9ppm: The maximum allowable concentration for short term exposure in a living area according to ASHRAE
  • 50ppm: The Federal OSHA standard for continuous exposure in any eight hour period.
  • 200ppm*: Maximum concentration allowable any time according to OSHA. Slight headaches, fatigue, dizziness, nausea after 2-3 hours.
  • 400ppm*: Frontal headaches within 1-2 hours, life threatening after 3 hours. Maximum allowable limit in flue gas according to EPA and AGA.
  • 800ppm*: Headache, dizziness, nausea, and convulsions with 45 minutes. Unconsciousness within 2 hours. Death within 2-3 minutes.
  • 1600ppm*: Headache, dizziness, and nausea within 20 minutes. Death within 1 hour.
  • 3200ppm*: Headache, dizziness, and nausea within 5-10 minutes. Death within 30 minutes.
  • 6400ppm*: Headache, dizziness, and nausea within 1-2 minutes. Death within 10-15 minutes.
  • 12800ppm*: Death within 1-3 minutes.

* With exposure to this concentration and higher the effects can vary depending on size, age, sex, and health.

 Model 770 Specifications
 Carbon Monoxide (CO) Measurement  Range 0 ~ 999ppm
 Accuracy  ±3ppm or 5% of reading whichever is greater
 Resolution  1ppm
 Data Storage  No
 Elapsed Time Indicator  Yes
 IR Printer Port  No
 Flue Probe  No
 Internal Pump  No
 Combustible Gas Leak Detection  No
 Backlight  Yes
 Alarm  Audible
 Power Supply  1.5V AA (2)
 Dimensions  1.5”x 6” x 2.75” (38.5 x 152 x 70 mm)
 Weight  6.4oz (181.5g)
 Warranty  3-year limited warranty 2-year sensor warranty

TPI Model 770 Demonstration Video

Model 770 Applications

  • Ambient CO safety checks

Frequently Asked Questions

Why should I purchase a pump driven CO analyzer rather than a less expensive CO monitor?
A pump driven analyzer is a much more versatile tool. The pump draws a sample into the instrument which allows source pinpointing. A pump driven instrumentwill also respond faster, and can be used for hot air (flue) sampling.

Can a CO analyzer be used for heat exchanger testing?
While a CO analyzer can provide a safety test of the furnace, it cannot provide a discernable test for heat exchanger integrity. The TPI HXG2 and HETKIT are recommended for this test and together are AGA approved.

How often should I calibrate my CO analyzer?
It depends on the use of the instrument. If used for service work, it is recommended that an annual calibration be performed. If any aspect of worker safety is included in the instrument’s job, monthly calibration is recommended.

If I perform my own calibration, do I increase my liability?
As long as traceable calibration gas is used and manufacturer’s calibration procedures are followed, liability will be minimized. Calibration records should be documented and retained.

How many calibrations can I expect out of a 21 liter bottle of calibration gas?
35-50 calibrations

How long will the CO sensor last?
Two to three years.

Product Documentationpdf-icon1

Click below to view or download product documentation PDFs:

770 Manual

770 Product Sheet

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