Humidity Transmitter HT
Model HT-ST-TH-XXX
Humidity transmitter HT that measures relative humidity (10–100% RH) and temperature with a thin-film capacitive sensor and Pt100, giving two-wire 4–20 mA outputs, ±2% RH accuracy and an IP65 watertight enclosure in wall, duct or separated versions.
Overview
About the Humidity Transmitter HT HT-ST-TH-XXX.
The HT humidity transmitter measures relative humidity and temperature and converts both into two-wire 4–20 mA signals for a PLC, SCADA or monitoring computer. Humidity is sensed by a thin-film capacitor and temperature by an RTD Pt100 element, housed in a compact ABS watertight enclosure. It is offered as a wall mount, duct mount or separated-probe version, accepts a wide 12–40 VDC supply and can be calibrated on site at zero and span. Typical uses include multi-point monitoring of KD rooms, where each room's reading can drive its own fuel gas damper or steam control valve.
Features
- Fast, stable and accurate measurement with excellent long-term stability
- ±2% RH and ±0.5 °C accuracy at 25 °C
- Watertight ABS enclosure rated IP65
- Compact size and easy mounting
- Wide input voltage range of 12–40 VDC
- On-site two-point calibration (zero and span)
- Separate two-wire 4–20 mA outputs for humidity and temperature
Models
- TH-102W: wall mount type
- TH-102D: duct mount type
- TH-103S: separated type
Applications
- KD rooms, including multi-room systems linked to PLC or SCADA
- Restaurants and hotels
- Parks and commercial centres
- Marine
- General industries
LKS supplies the HT humidity transmitter in Malaysia, with installation, calibration and after-sales support. Contact our engineers for model selection and a quotation.
Specifications
| Model | HT-ST-TH-XXX (TH-102W wall, TH-102D duct, TH-103S separated) |
|---|---|
| Humidity range | 10–100% RH (non-condensing) |
| Temperature range | 0–100 °C (−20 … 80 °C, 0 … 50 °C, −40 … 60 °C available) |
| Accuracy (at 25 °C) | ±2% RH, ±0.5 °C |
| Long-term stability | Better than 1% RH per year (typical) |
| Temperature compensation | ±0.008% RH/°C (effect at 0% RH) |
| Response | < 15 s (90% at 25 °C in moving air at 0.5 m/s) |
| Humidity sensor | Thin-film capacitor |
| Temperature sensor | RTD Pt100 Ω, IEC 751, DIN 43760 |
| Humidity output | 4–20 mA, 0–100% RH (linear), two-wire |
| Temperature output | 4–20 mA, 0–100 °C (linear), two-wire (scalable) |
| Supply voltage | 12–40 VDC |
| Sensor protection | Sintered filter, part no. TR-3066 (option) |
| Housing | ABS plastic watertight enclosure, IP65 |
| Connections | Liquid-tight nylon cable bushing for Ø5–10 mm cables |
| Ambient temperature | −40 … 85 °C |
| Weight | Approx. 150 g |
Lifecycle support
Installed, calibrated and maintained.
With more than two decades in valves and instrumentation across a diverse range of industries, we keep instruments accurate and valves healthy, because valve health management is vital for plant safety.
- Installation & commissioning
- Calibration & testing
- Maintenance & overhaul
- Dismantling & replacement
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