The BOILERWATCH® MMP II-SSX acoustic pyrometer is an advanced industrial instrument that provides fully automatic measurement of high combustion-gas temperatures, permitting fuel trimming control within heaters and boilers.

The system is completely non-intrusive, and operates on the principal that the speed of sound in a gas is proportional to the temperature of that gas.

Acoustic transceivers are mounted on the outside of walls of the heater/boiler, and a high intensity acoustic signal is transmitted through the gas stream.

Since the distance between the sound source and receiver is known and fixed, the average temperature of the gas along the acoustic path is computed from an accurate measurement of the sound signal’s transit time.

BOILERWATCH® MMP II-SSX systems are available in a variety of configurations. With up to 24 individual path temperatures available, systems may be configured for spatial 2 dimensional temperature mapping, independent temperature measurements, or a combination of both. BOILERWATCH® MMP II-SSX systems are easy to install, commission, and operate.

3O2OTR-SSL Transceiver Unit Wave Guide and Preamplifier

Pneumatically driven acoustic sound source and receiver.  Mounts on exterior furnace /heater wall, and provides acoustic transmitter and receiver functions for balanced-draft furnace or pressurized applications.

Processor Control Unit (PCU)

Provides temperature measurement capacity for up to eight (8) independent paths , or up to a twenty-four (24) path array for spatial temperature distribution mapping.


Features include:  Industrial computer with pre-configured mapping software; 24 inch LCD monitor; modem for remote accessibility; OPC Outputs for integration into plant DCS.

Typical Configuration

3020TR-SSL Transceiver Unit - Wave Guide and Preamplifier

Wave Guide

Material: Stainless Steel 316L
Dimensions: 8 inch flange diameter, 14 inch length
Flange: In accordance with ASTM standard 3-inch 150 lb. pipe flange
Weight: 26 lb. (11,8 Kg.)
Temperature Environment: Flange: +450ºF (+232ºC) max.; Ambient Air: +130ºF (+54ºC) max.
Noise generated: Inside: 126bB. Outside: 0dB


Ambient Air Temperature: + 140 ºF (60ºC) maximum, No solar loading on cabinet
Enclosure: 6 in x 12in x 10in
Weight14 lb (6,4 Kg)
Industrial StandardsNEMA/EEMAC Type 4,12, 13. IEC 60529, IP66

BOILERWATCH® MMP-II-SSX Processor Control Unit (PCU)

Ambient Air Temperature: + 130 ºF (54ºC) maximum, No solar loading on cabinet
Enclosure: 30in x 24in x 12in
Weight: 110 lb (50Kg)
Industrial Standards: NEMA/EEMAC Type 4,12, 13. IEC 60529, IP66


Number of Ports: Two minimum and up to sixteen maximum
Number of Paths: Up to twenty-four (24) paths
Measurement Range: 32ºF to 3500 ºF (0ºC to 1927 ºC)
Temperature Units: English or Metric (ºF or ºC)
Resolution: 12 ºF (6.7 ºC) for 20 meter path length @ 2000 ºF (1093ºC)
Accuracy: 5 seconds per path typical
Measurement Acquisition Time: Better than 0.5%
Data Output: OPC/Ethernet
AC Power Input: 120 to 240 VAC, 50/60 Hz.
Air Pressure to Sound Source: Air Service. 60 – 120 psig (5.0 – 8.3 Bar).
Air consumption: 5 bar = 2.26 m3/min (No Constant)
Warranty: Two (2) years.


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