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) |