HT1D Humidity/Temp Duct

Higher Reliability, Faster Installation, Superior Accuracy | Sense the Difference
2% or 3% accuracy (NIST certification options)
0-5V/10V and 4-20mA RH/Temp (thermistors optional)
LCD display with field calibration menu
Field replaceable element

  • 2% or 3% RH versions with field replaceable sensor
  • Switch selectable 5V/10V and 4-20mA RH/T transmitter outputs
  • Thermistor outputs for temperature optional
  • Field calibration. LCD and push-button menu allows easy adjustment of calibrated RH value as needed to maintain certification.
  • Field replaceable sensor—without disturbing conduit
  • On-board temperature compensation for RH. Eliminates temperature coefficient errors and achieves excellent measurement accuracy, high repeatability, and offset stability.
  • State-of-the-art testing facilities. Certification options: 8-point (NIST traceability—consult factory)
  • Industry-leading 7-year warranty/ 2-year replaceable element warranty

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The HT1D Series is designed with both the engineer and field technician in mind. The HT1D Series combines excellent stability with reliable operation in 2% or 3% RH accuracy options. Optional temperature transmitters, RTDs and thermistors add further flexibility when ordering. The standard LCD and field replaceable elements make the initial installation and future service a breeze.

  • HVAC room humidity and temperature measurement and control
  • Replaceable element is ideal for difficult environments such as swimming pools
  • Facilitating compliance with ASHRAE 62.1 standard for air quality
  • Indoor air comfort and control in HVAC systems
  • Maintain healthy air quality, minimize mold and other contaminants
  • Museums, hospitals & other critical environments
  • Offices, conference rooms, & indoor public areas
  • Industrial process control environments

Power Supply

AC Supply/DC Supply

24VAC, 100mA max. /12-30VDC, 50mA max.

Outputs

RH% and Temperature

3-wire 0-5/10V(4) (jumper) or 2-wire 4-20mA, selectable

Output scaling

RH%
Temperature

0-100% RH
32-122°F (0-50°C) or -40-140°F (-40 to 60°C) (jumper)

Thermistor/RTD

Optional

See ordering table

Media filter

PBT with water-vapor permeable membrane

Relative Humidity

Accuracy
Resolution
Hysteresis
Repeatability
Non-Linearity
Temperature coefficient
Response time (2)
Output update rate
Operating range
Long term drift
Operating conditions (3)

2% models, ±2% max 0 to 100%RH; ±1.5% typ 0 to 80% RH @25°C
3% models, ±3% max 0 to 100%RH; ±2% typ 0 to 100% RH @25°C
0.01%RH
±0.8%RH
0.08% RH
factory linearized <1%RH
fully compensated by on-board temp sensor
8s
0.5s
0 to 100%RH (non-condensing)
<0.25%RH per year
41 to 140°F (5 to 60°C) @20 to 80% RH

Temperature

Accuracy
Resolution
Repeatability
Response time (2)
Output update rate
Operating range

2% models, <±0.25°C; 0.1°C typ @ 25° C
3% models, <±0.3°C; 0.25° C typ @ 25° C
0.01° C
0.4° C
2s
0.5s
-40 to 140°F (-40 to 60°C)

Enclosure

Materials
Dimensions
Enclosure Rating
Unit Temp Rating

ABS/Polycarbonate
4.0"h x 4.4"w x 2.1"d (+6.8" probe)
IP20/NEMA 1
-40°F to 158°F (-40 to 70°C)

  1. One side of transformer, secondary is connected to signal common. Dedicated transformer is recommended.
  2. Time for reaching 63% of reading at 25° C and 1 m/s airflow.
  3. Long term exposures to conditions outside normal range at high humidity may temporarily offset the RH reading (+3%RH after 60 hours.)
  4. 15-30VDC/24VAC power supply voltage required for 10 volt output.

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