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RF MacDonald Co. offers sales, packaged systems design, service, installation, and parts for our customers!

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Since 1923 H.O. Trerice Co. has endeavored to produce a complete line of the highest quality temperature and pressure instrumentation and controls for the various industries it serves. Trerice's track record of engineering and manufacturing excellence has provided us with an internationally recognized reputation for performance in service and product. 

Trerice 91000 Series Self-Operating Temperature Regulatorsare the #1 choice of original equipment manufacturers, mechanical contractors and the process industry. These regulators are the ideal choice for temperature control of tanks, process streams and industrial equipment. The self-operating design provides reliable performance under the most extreme conditions without the need for an external power source. These regulators are available with 2-way and 3-way valves in sizes ranging from 1/8" reduced port to 6". Capillary systems as well as thermowells are available in a variety of materials to withstand the harshest conditions. 

Trerice Electronic Controllersare recommended for use on applications where large load changes are expected, or the need for extreme accuracy and fast response time exist. With full "auto tune" capabilities and a large selection of inputs, Trerice Electronic Controllers are ideally suited for use with Trerice Control Valves.

Trerice Series 87700 Pneumatic Indicating Controllers are available for either temperature or pressure control and may be specified with on-off proportional pneumatic outputs. These controllers are ideally suited for use with Trerice air-operated control valves. The Trerice Model L84000 electric contact indicating temperature controller is available in single or multiple switch configurations (up to 4) and is used in conjunction with Trerice 960 Series solenoid valves. Solenoid valves can be supplied in sizes 3/8" through 3". 

Trerice Air Operated Diaphragm Control Valvesare actuated by 3-15 PSIG air signal from either a Trerice Model 87700 Pneumatic Controller or a Trerice Model TAPAB I-P Transducer used in conjunction with a Trerice Model TR863 Electronic Controller. Our 910 Series comes standard with many of the features usually available on more expensive units. The 940 Series is well suited to severe service conditions where its heavy duty construction and high performance capabilities make it the choice of specifying engineers across a wide range of industries. These valves are available in sizes from 1/8" reduced port through 8" in 2-way and 3-way designs in a number of body materials. We also offer a variety of plug designs as well as both pneumatic and electro-pneumatic positioners and a full compliment of other accessories. 

The Trerice BX Type Industrial Thermometerhas long been recognized as the industry standard. This adjustable angle, aluminum case, mercury-in-glass thermometer is also available in rigid case configurations (7", 9", 12"), and with various stem length and stem material options. Union connection bushings and thermowells are available in a wide selection of dimensions and materials.

Trerice Bimetal Thermometersare available in a wide variety of configurations including adjustable angle, back or bottom connection. Dial sizes are 5", 3", 2", 1 3/4" `& 1". All models are of welded stainless steel construction and are hermetically sealed. The 5" diameter adjustable angle model is excellent for most industrial applications where maximum read-ability and angle of installation are important. The 3" rigid back or lower connection models offer high quality at an economical price. There is a Trerice bimetal thermometer available for every application. 

Trerice Dial Thermometers are available in either adjustable direct mounted or remote connected designs with bronze or stainless steel sensing bulbs and connecting tubing. Actuation mediums are vapor, solid liquid or mercury and cover a wide variety of applications and temperature ranges from -100 degrees F to 1000 degrees F. Cases are 3 1/2" stainless steel or 4 1/2" through 8 1/2 " cast aluminum

Trerice Pressure Gauges have won praise from mechanical designers, construction engineers and industrial instrumentation specialists for their rugged design and quality of manufacture. There is a Trerice gauge available for nearly every application, in a wide variety of sizes (1 1/2" through 12"), styles and materials. Trerice accessories are available to handle the most severe applications.

Trerice Diaphram Seals protect and isolate the pressure sensing elements of pressure indicating devices such as gauges, switches and transmitters from corrosive process fluids. All Trerice Diaphragm Seals are of the continuous duty type which minimizes the possibility of diaphragm rupture leading to the escape of the process fluid. Trerice Diaphragm Seals are available in a number of different styles and configurations in a wide variety of materials of construction to meet the demands of all applications.