Skip to Main Content
  • Instrumart
Instrumart logo
  • Products
  • Brands
  • Applications
  • Lab
  • Blog
  • Account
  • Email Us
  • 1-800-884-4967
  • What can we help you find?

    Can’t find what you’re looking for? Contact one of our engineers today. We’re open 8:00 am to 5:30 pm ET.
    • 1-800-884-4967
    • Email Us
    • Live Chat
  1. Carbon Dioxide (CO2) Detectors

Honeywell 90DM4 Infrared CO2 Monitor

Reliable infrared sensing technology with drift and temperature compensation.

Honeywell 90DM4 Infrared CO2 Monitor
Honeywell 90DM4 Infrared CO2 Monitor
Retired products cannot be ordered

View Company Reviewsby Trustpilot
Manufactured
  • By Honeywell
Includes
  • FREE Ground Shipping on orders of $1,000 or more
  • FREE Lifetime Tech Support
Questions?
Call 1-800-884-4967 or email sales@instrumart.com. Open 8:00 am to 5:30 pm ET.
Trustpilot

Overview

Features

  • Wall or duct mountable
  • Detection Range: 0-2,000 ppm or 0-50,000 ppm (0-5%)
  • Accuracy: ± 100 ppm + 3% of reading
  • Response Time: < 60 sec. (for 90% of the reading)
  • 1 SPDT Relay; Output Rating: 5A, 30 VDC or 250 VAC (resistive load)
  • LCD Display
  • Operating Humidity Range: 0-95% RH, Non-condensing
  • Operating Temperature Range: 0 °C to 40 °C (32 °F to 100 °F)

Description

The Honeywell 90DM4 infrared CO2 monitor offers drift and temperature compensation, in addition to a redesigned enclosure built to enhance airflow. To provide maximum versatility, the 90DM4 is available with two different housing configurations, making it ideally suited to virtually any commercial or industrial gas detection application. Both enclosures are made of ABS plastic, offering maximum durability.

Other features of the Honeywell 90DM4 infrared CO2 monitor include a relay contact closure, 0-5% detection range and modbus network output (RS-485). Installation, connection and use of the 90DM4 are user-friendly and the 90DM4 features menu-driven, easy calibration.

With state-of-the-art microprocessor controlled CO2 monitoring, coupled with refined performance, the Honeywell 90DM4 is the top choice for monitoring CO2 levels in schools, offices, or any other commercial application.

Documents

Documents

  • Honeywell 90DM4 Infrared CO2 Monitor Data Sheet PDF (177 KB)
  • Honeywell 90DM4 Infrared CO2 Monitor Manual PDF (1.1 MB)
  • All possible part numbers

Need Help? Call a Temperature engineer at 1-800-884-4967

We're open 8:00 am to 5:30 pm ET

Rhys D. headshot Rhys D.
Applications Engineer
Shawn D. headshot Shawn D.
Senior Applications Engineer
20 years at Instrumart
Luke M. headshot Luke M.
Applications Engineer
5 years at Instrumart
David S. headshot David S.
Applications Engineer
Alex A. headshot Alex A.
Senior Applications Engineer
19 years at Instrumart
Dwight M. headshot Dwight M.
Senior Applications Engineer
28 years at Instrumart
Ron J. headshot Ron J.
Temperature Engineering Lead
29 years at Instrumart
Rhys D. headshot Rhys D.
Applications Engineer
Shawn D. headshot Shawn D.
Senior Applications Engineer
20 years at Instrumart
Luke M. headshot Luke M.
Applications Engineer
5 years at Instrumart
David S. headshot David S.
Applications Engineer
Alex A. headshot Alex A.
Senior Applications Engineer
19 years at Instrumart
Dwight M. headshot Dwight M.
Senior Applications Engineer
28 years at Instrumart
Ron J. headshot Ron J.
Temperature Engineering Lead
29 years at Instrumart
Rhys D. headshot Rhys D.
Applications Engineer

Recently Viewed

Honeywell 90DM4 Infrared CO2 Monitor
Honeywell 90DM4 Infrared CO2 Monitor
United States Canada Mexico
Shop
Products
Brands
Applications
Support
Customer Service
Ask a Question
Live Chat
Track Order
Fraud Prevention
Financing
Our Company
Blog
About Us
Contact Us
Jobs
Travel Information
Our Team
Privacy Policy
Accessibility Statement
Connect
1-800-884-4967
sales@instrumart.com
Instrumart
35 Green Mountain Dr
S Burlington, VT 05403 US
Mo-Th 8:00am to 5:30pm ET
Fr 8:00am to 5:00pm ET
Join Us on Facebook
Follow Us on X

Instrumart is a member of a family of industrial stores

Instrumart Compressor World Pump World BioPharm World Filtration World Motion World Qualitrol Engineered Solutions Wholesale Air Pipe
© Instrumart 2025

Family of Industrial Stores

Welcome to our family of stores, your go-to source for a wide selection of commercial and industrial products in the flow control and automation sectors. Each store features a curated range of specialized industrial solutions, with many items designed to complement each other, ensuring you can find everything you need for your specific application. Explore the stores below to discover our extensive product offerings for your business needs.

  • Instrumart

    Shop Industrial and Laboratory Instruments.

    Shop Now!
  • Compressor World

    Shop Compressed Air Equipment.

    Shop Now!
  • Pump World

    Shop Industrial, Water, and Waste Water Pumps.

    Shop Now!
  • BioPharm World

    Shop Sanitary Process Solutions and Products.

    Shop Now!
  • Filtration World

    Shop Industrial Filters.

    Shop Now!
  • Motion World

    Shop Motion Control and Process Automation Systems.

    Shop Now!
  • Qualitrol

    Shop Remanufactured or Repair Automation Products.

    Shop Now!
  • Engineered Solutions

    Shop Custom Engineered and Manufactured Systems.

    Shop Now!
  • Wholesale Air Pipe

    Shop Air Piping.

    Shop Now!