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Preferred Instruments

Preferred Instruments manufactures microprocessor based controllers, instruments, and electric actuators for combustion and process applications. Preferred Instruments also manufactures oil tank gauging and leak detection equipment. A major component of the Instrument group sales is from control systems integration and personal computer based Supervisory Control and Data Acquisition systems. Preferred Utilities' industrial factory is located in Danbury, CT

Transmitters and Sensors

Transmitters and Sensors


Draft Range Transmitter Assembly
Model JC-22XMTR, Draft Transmitter with Low Draft Cutout Switch – Field mountable boiler draft range transmitter and independent high pressure cut-out switch with 5 second time delay relay.

In-Situ Oxygen Sensor
Model ZP In-Situ Oxygen Analyzer – Detector consists of a zirconium oxide cell, a ceramic heater with thermocouple, terminals for connecting to the controller unit, a flange for connection to the probe, opening to accept reference (ambient) air and a connection for calibration gas. The probe is a stainless steel assembly that mounts on a 3″ 125 lb flange (flat face) located on the flue gas duct or stack. Available in our factory, Danbury Connecticut (CT).

Shaft Position Sensor
Model SPS, Shaft Position Sensor – General purpose feedback pot for applications that require firing rate feedback as a basis for establishing setpoints for other control loops such as Oxygen Trim or FGR Flow.

Steam Pressure Transmitter
Pressure Transmitter with Steam Siphon Loop – Specifically designed for industrial applications and typical industrial grade environments. Standard features are tailored for applications involving extreme environmental conditions and those that require more stringent performance needs.