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HVAC Sensors

HVAC Sensors
HVAC Sensors
An HVAC sensor is any device used to measure the conditions of an enclosed space, room or building. HVAC sensors include thermostats, humidistats, carbon dioxide sensors, pressure sensors and more.

HVAC sensors are connected to equipment and regulate air quality. Thermostats measure temperature, switching on and off heaters and air conditioners so that measured temperature matches a predetermined setpoint. Humidistats measure humidity and work with thermostats and heaters to protect equipment from condensation and corrosion. Carbon dioxide sensors monitor the quality of the air and regulate fresh air with ventilation adjustments. Pressure sensors monitor and adjust air flow.

HVAC sensors are ultimately responsible for the efficiency of the entire HVAC system and the overall air quality of the environment.

Transmitter Outside Air Series Image
The ACI Transmitter Outside Air Series features a two-wire, 4 to 20 mA loop powered output with optional 3-Wire voltage output signals available. These units are designed to be mounted out of direct sunlight on the North side of a building or under an eave or intake hood. The Ruggedized epoxy coated transmitters "-POT" option should be used in extreme environments or in applications where you are looking for improved accuracy and reduced thermal drift due to the thermally conductive epoxy and more consistent board temperatures. Zero and Span adjustments are available for recalibration in the field when using NIST Certified equipment. All units include a Weather Proof or NEMA/IP rated enclosure and 1/2" knockouts or 1/2" NPT threaded hubs for use during installation. We recommend the use of 18 to 22 AWG shielded cable for all temperature transmitter installations to protect against the introduction of noise onto the signal lines. ACI does offer recalibration services for any transmitters sent back to us for a nominal fee.
LP3 Series Image
  • Jumper selectable 2 wire current and 3 wire voltage outputs
  • 24 Vac/dc power supply
  • Six variable jumper selectable pressure ranges, W.C. & Pa.
  • Available options include LCD display and integrated static probe
Relative Humidity Series Image
  • Humidity Sensor/Transmitter
  • Approvals: CE
  • Capacitive Sensing Element
  • On Board DIP Switches
  • Moisture Resistant
Humidity transmitters built to withstand a variety of conditions. Long-lasting and increased flexibility for ideal performance. Can be used both indoors and outdoors.
AFS Series Image
The AFS Series Differential Pressure Switches are general purpose proving switches designed for both HVAC and Energy Management applications. These pressure switches can be used to sense positive, negative, or differential air pressures when used in conjunction with an A/SPT or A/VPT Series sampling tube. The plated housing contains a diaphragm, calibration spring and single snap-acting contact closure with either a manual or automatic reset switch depending on the model. The enclosure cover contains a 1/2" conduit knockout and guards against accidental contact with the live switch terminal screws as well as the set point adjusting screw.
590 Series Image
  • 0 to 10 VDC Analog Output
  • 10 psi Proof Pressure on all Ranges
  • Internal Regulation Permits use of Unregulated DC Power Supplies
  • No Field Calibration or Adjustment Needed
  • 24 VAC Supply
The Very Low Differential Pressure Transducers sense differential or gauge (static) pressures and convert pressure difference to a proportional electrical output. The 590 Series is offered with a 0 to 10 Vdc output. Used in Building Energy Management Systems, these transducers are capable of measuring pressures with the accuracy necessary for proper building pressurization and air-flow control. The 590 Series Transducers are available in five different air pressure ranges. Static accuracy is 1% full scale in normal ambient temperature environments. The units are temperature compensated to less than 0.033% FS/F of thermal error over the temperature range of 0F to +150F.
The Very Low Differential Pressure Transducers are used for the following applications:
  • Heating, Ventilation and Air Conditioning (HVAC)
  • Energy Management Systems
  • Variable Air Volume (VAV) and Fan Control
  • Environmental pollution control
  • Static duct and clean room pressures
265 Series Image
  • Internal Regulation
  • Voltage or Analog Outputs
  • Fire Retardant Case
Setras Model 265 is a lower price solution that offers an excellent price to performance ratio and meets the requirements in all typical HVAC applications. The 265 is a low differential pressure transducer that uses a dead-ended capacitive sensing element that requires minimal amplification and delivers excellent accuracy and longterm stability. It delivers 1% FS accuracy with 0.25% and 0.5% accuracy options with pressure ranges from 0.25 W.C. up to 100 W.C. The 265 has a small footprint, an AC power option and an optional conduit cover that allows for simple, secure installation for any applications.
CMD Series Image
  • LCD Display
  • 0~100, 150, 300, 400, or 500 PPM (Selectable) Measurement Range
The CMD Series carbon monoxide detector uses a superior electrochemical sensor for reliability and accuracy in even the most critical applications. The standard product features a 2-wire loop-powered output. Optionally, the device may configure with an alarm relay which operates in 3-wire sourcing mode and/or with Modbus communications.
Transmitter Board Only Series Image
The ACI Transmitter Board Only Series features a two-wire, 4 to 20 mA loop powered output signal with optional 3-Wire voltage output signals available. Sensors are not included with the board only transmitter since they are designed to be used with any existing 100 or 1000 Ohm Platinum RTD sensor with a 385 temperature coeficient. All transmitters must be ordered with the temperature span that you require, since the boards are tuned to give you the best performance characteristics for the temperature span specified. Zero and Span adjustments are available for recalibration in the field when using NIST Certified equipment. We recommend the use of an 18 to 22 AWG shielded cable for all temperature transmitter installations to protect against the introduction of noise onto the signal lines. For applications in which a much you are looking for increased temperature performance and a higher level of corrosion and moisture resistance, our Ruggedized (Thermally Conductive Epoxy Coated) transmitters are also available. ACI does offer recalibration services for any transmitters sent back to us for a nominal fee.
Thermistor Probe Only Series Image
The ACI Thermistor Probe Only Series features a 1/4" diameter stainless steel probe with two, 14" or 24 inch 22 AWG Etched Teflon colored lead wires to differentiate the different NTC sensor types. The sensors in this series are manufactured using ACI's proven double encapsulation process to eliminate the effects of moisture upon the sensors and to increase the thermal response time using our high quality, thermally conductive epoxy. The probe is designed to be used in duct and immersion applications when used with the proper length thermowell.
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