Kele Precision Manufacturing offers the following products for the building control industry.  They are available in current form in small and large volumes and can also be customized for a specific application.

HW Series

5% RH Sensor/Transmitter
3% Humidity Transmitter & Optional Temperature Transmitters

Model H-31K 3% Air Humidity Transmitters are specifically designed for user in HVAC/BAS applications. These instruments measure relative humidity from 0% to 100%. The standard two-wire, 4-20 mA output provides low cost humidity monitoring for building control. The RH transmitter is available with thermistor or RTD temperature sensors or a 4-20 mA rangeable temperature transmitter. H-31K models available in room, duct, and OSA mounting styles.

FEATURES

  • 0% to 100% RH measurement
  • ±3% accuracy (5% to 95% RH)
  • Two-Wire, 4-20 mA output
  • White plastic design

SPECIFICATIONS
Sensing Element  Capacitive Polymer Transmitter 4-20mA, 675ohm
@ 24V (HD31K & HO31K only)
Accuracy ±3% RH @ 77°F (25°C), 5% to 95% RH Supply Voltage 18 – 35 VDC
Temp Effect Temperature compensated with 0.005% RH per °F (0.01% per °C) Ambient temp -20° to 140°F (-28° to 60°C)
Long-term stability <±1% drift per year, typcial Storage temp -58° to 185°F (-50° to 85°C)
Output humidity Two-wire, loop-powered, 4-20 mA = 0% to 100% RH linear Max load impedance (Supply voltage – 12 VDC) /0.02
i.e. 600ohm@24VDC
Output temp Two-wire, loop-powered, 4-20 mA Connections Screw terminals for loop termination
Temp range limits -30° to 250°F (-34° to 121°C), min span of 40°F (22°C) Enclosure White plastic
Optional temp Thermistor Type 3, 21, 22, 24, 27, 42 Weight 1.2 lb (0.55 kg)
RTD Type 81, 85, 91

HD Series

3% Duct / Outside Air RH Sensor / Transmitter

Model HD30K Duct and HO30K Outside Air Humidity Transmitters have been specifically designed for use in HVAC/BAS applications. These instruments measure relative humidity from 0% to 100%. The standard two-wire, 4-20 mA output provides low cost duct and outside air monitoring for building control. Both duct and outside air RH transmitters are available with thermistor or RTD temperature sensors or with a 4-20 mA rangeable temperature transmitter.

FEATURES

  • 0% to 100% RH measurement
  • ±3% accuracy (5% to 95% RH)
  • Two-wire, 4-20 mA output RH
  • Optional temperature thermistor
  • Optional temperature RTD
  • Optional temperature 4-20 mA

SPECIFICATIONS
Sensing Element  Capacitive Polymer Operating temp -20° to 185°F
(-28° to 60°C)
Accuracy ±3% RH @ 77°F (25°C), 5% to 95% RH Storage temp -58° to 185°F
(-50° to 85°C)
Temp Effect Temperature compensated with less than  0.005% RH per °F (0.01% per °C) Max load impedance (Supply voltage – 10 VDC) /0.02
i.e. 700 ohm @ 24 VDC
Long-term stability Less than ±1% drift per year, typcial Connections Screw terminals for loop termination
Output humidity Two-wire, loop-powered, 4-20 mA = 0% to 100% RH linear Enclosure Single-gang, pressure-cast aluminum weatherproof box with gasketed cover
Supply Voltage 18-35 VDC Weight 1.20 lb (0.55 kg)
Operating range 0% to 100% RH, 4-20 mA Optional temp Thermistor type 3, 21, 22, 24, 27, 42 RTD type 91, 81 4-20 mA, 650ohm @ 24V

KHR Series

3% Duct / Outside Air RH & temperature Sensor / Transmitter

Models KHR and KHD are low cost, general-purpose humidity transmitters that utilize capacitance technology. Wide range and good accuracy make these ideal humidity transmitters for locations where ±5% RH readings are required. The sensors are designed for indoor applications where relatively stable temperature conditions exist. The sensors should not be exposed to vapors, such as acetone, that attack plastics.

FEATURES

  • Fast response
  • Accuracy ±5% 10% to 90%
  • Humidity span 0% to 100%
  • 4-20 mA signal
  • Highly stable
  • One-year warranty

SPECIFICATIONS
Output range 0% to 100% Operating temp 32° to 122°F (0° to 50°C), 0% to 100% RH, noncondensing
Accuracy ±5% (10% to 90% RH) Transmitter output 4-20 mA, DC two-wire (0% to 100%)
Linearity ±3% Power requirement 18-35 VDC
Hysteresis 3% (10% to 90% RH) Max external load 600ohm @ 24 VDC
Temp dependence 0.2% RH per °C Weight 1 lb (0.45 kg)