This document provides specifications for various combustion, tachometer, and hygrometer equipment made by Dwyer Instruments, including models that monitor carbon monoxide and dioxide levels, measure rotational speed, and measure humidity and temperature. The models can be used for applications like measuring flue gases, calibrating boiler systems, combustion tests, and monitoring indoor air quality. The document also states that Dwyer Instruments' name and logos cannot be reproduced or used without permission.

1. Miscellaneous Test Equipment
Combustion, Tachometers, Hygrometers
The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees
as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes.
Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used
without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.

2. Introduction – Model 450A
Monitors ambient carbon monoxide levels
Dual-line, back-lit LCD screen displays current
CO and maximum CO level since last reset
Audible alarm for levels above 25 PPM
Compact size and includes carrying case with
belt loop to use as personal CO alarm

3. General Specifications
Range:
CO: 0 to 999 PPM ± 20% <100 PPM; ±15% >100 PPM of
reading
170 mm x 43 mm physical size
Battery operated with 3 AAA alkaline batteries

4. Introduction – Model 1205B
Monitors carbon monoxide and carbon dioxide
in ducts or rooms
Large LCD screen displays CO and CO2
Stores 255 time stamped sets
Can output measurements to a serial printer
Rotary dial for parameter selection on the
display

5. General Specifications
Range:
CO: 0 to 1000 PPM ± 5%
CO2: 200 to 4000 PPM ± 5%
Probe: 200 mm insertion length
Battery operated or line voltage power supply

6. Introduction – Model 1207A
Allows for easy adjustment of boilers for
optimum energy efficiency
Large LCD screen displays four parameters
Stores 255 time stamped sets
Can output measurements to a serial printer
Ready to use in Natural Gas, Light Oil, Propane,
Butane, LPG, and Wood Pellet Applications

7. General Specifications
Range:
O2: 0 to 21% ± 0.2%
CO: 0 to 2000 PPM ± 5%
CO2: 0 to 30% ± 0.3%
Flue and Net Temp: 0 to 600°C ± 0.3%
Efficiency: 0 to 99.9% ± 1%
Excess Air: 0 to 250% ± 0.2%
Probe: 200 mm insertion length
Battery operated or line voltage power supply

8. Applications
Measuring flue gases
Calibration of boiler systems
Combustion tests
Monitoring indoor air quality

9. Introduction – Model TAC-L
Portable Digital Tachometer
Measures rotational speed
Reads up to 508 mm
Includes LCD with backlit display

10. General Specifications TAC-L
Accuracy: ±0.05%
Range
Non-Contact (RPM): 2.5 to 99,999 RPM
Contact (RPM): 0.1 to 19,999 RPM
Non Contact Measuring Distance: 50 to 500 mm
Sample Time: 0.8 seconds

11. Introduction – Model TAC3
Ergonomic Design
5 digit alphanumeric LCD
Easy to switch between English and Metric units
Includes NIST certification
Can include remote optical sensor to take
readings in hard to reach locations

12. General Specifications – TAC3
Accuracy: ± 0.05%
Display: Dual LCD display
Measurement Distance: up to 7.6 m and up to
70° from perpendicular
Battery Powered

13. Applications
Measure Rotational speed of:
Saw blades
Grinders
Engines
Motors
Powder and bulk conveyor belts
HVAC fan motors

14. Introduction – Model 471B-1
Handheld instrument used for measuring
relative humidity and temperature
Can calculate dew point and wet bulb
temperature
Stores up to 99 readings with the non-volatile
memory function

15. General Specifications
Display: 4.5 digit LCD
Range
RH: 0 to 100% (non-condensing)
Temperature: -20 to 140°F
Accuracy
RH: ±2% FS over 10 to 90% RH @ 25°C
Temperature: ±0.54°C @ 25°C
Weight: 16 oz

16. General Specifications
Probe length: 200 mm
Power Requirements
9V alkaline battery, installed, non-functional, user replaceable
Agency Approvals: CE

17. Introduction – Model TH2-10
Handheld instrument used for measuring
relative humidity and temperature
Can calculate dew point and wet bulb
temperature
Stores up to 99 readings with the non-volatile
memory function

18. General Specifications
Display: 4.5 digit LCD
Range
RH: 0 to 100% (non-condensing)
Temperature: -28.9 to 60°C
Accuracy
RH: ±2% FS over 10 to 90% RH @ 25°C
Temperature: ±0.54°C @ 25°C
Weight: 16 oz