The HTE.Vx series transmitters are designed to measure relative humidity and temperature in climate control, ventilation, and air conditioning systems. Two designs are available: wall-mounted (HTE.VS) and duct-mounted (HTE.VD).
Capabilities of transmitters with RS-485 interface (Modbus RTU protocol):
Features of HTE.VS-2T-RS modification with RS-485 interface and PNP transistor outputs:
| Modifications | HTE.VD | HTE.VS |
|---|---|---|
| Relative humidity | ||
| Relative humidity readings (measurements) range | 0 to 100% (5 to 95%) | |
| Absolute error limit (at ambient temperature +25 °C and 1 m/s airflow velocity) | ±3% | |
| Response time (63% with standard protective cap, 1 m/s airflow) | 8 s | |
| Response time (95% with standard protective cap, 1 m/s airflow) | 30 s | |
| Temperature | ||
| Temperature measurement range depending on design |
-20…+80 °C (for transmitters with analog and combined output) -40…+80 °C (for transmitters with digital output) * |
|
| Absolute error limit | ±0.8 °С | |
| Electrical characteristics | ||
| Output analog signal range * |
4…20 mA (0…20 mA) (analog output) 0…10 V (0…1, 0…3, 0…5 V) (RS-485 interface) |
|
| DC supply voltage depending on the output signal type |
24 VDC ±5 % (nominal for all modifications) 10…30 VDC (4…20 mA) 5…30 VDC (0…1 V, 0…3 V or digital output) 7…30 VDC (0…5 V) 13…30 VDC (0…10 V) 5…30 VDC (PNP digital output) |
|
| Power consumption ** |
4.3 mA (for transmitters with current output) 4.7 mA (for transmitters with voltage output) 6.4 mA (for transmitters with RS-485 and voltage output) 6.1 mA (for transmitters with RS-485 and current output) 6 mA (for transmitters with RS-485 and transistor outputs) |
|
| Allowable load resistance for current output | see Allowable load resistance of current output | |
| Minimum load for voltage output |
1 kΩ (0…1 V) 3 kΩ (0…3 V) 5 kΩ (0…5 V) 10 kΩ (0…10 V) |
|
| Digital output type | - | PNP transistor, open collector (Imax=200 mA) |
| Digital output setpoint configuration range * | - | -20 to +80 °C (temperature channel) 0 to 100% (humidity channel) |
| Digital output hysteresis * | - | 2 °C (temperature channel) 5%(humidity channel) |
| Digital output interface | RS-485 (Modbus RTU) | |
| Maximum allowable cable length | 1000 m | |
| Other characteristics | ||
| Measuring probe length | 100, 150, 200, 250 mm | - |
| Weight, max | 140 g | 250 g |
| Ingress Protection | IP65: housing IP20: sensor |
|
| Transmitter material | ||
| Protective cap | ABS plastic (black) | |
| Housing | ABS plastic (grey) | |
| Measuring probe | stainless steel AISI 304 | - |
| Filling compound | silicone | |
| Operating conditions | ||
| Minimum air flow rate | 1 m/s | |
| Ambient temperature | -40…+80 °C | |
| Allowable atmospheric pressure | 86…106 kPa | |
| Relative air humidity | max 100% | |
| Polling period (for transmitters with digital signal) | ≥ 1 s | |
* - User configuration is available for transmitters with RS-485 interface. At the same time, the metrological characteristics are valid only for current 4-20 mA and voltage 0-10 V output signals.
** - At 24 VDC supply voltage without analog and digital output signals connected. RS-485 load is 120 Ω.
Attention! When connecting the device current outputs, add an external load resistor (RL) in series with the instrument’s measuring input resistor (RMEAS.). Choose RL so that the sum RMEAS. + RL stays within the permissible load range at the given supply voltage (see the external wiring diagram for HTE.PF‑I…). This reduces the influence of self-heating. For example, for a 24 VDC supply voltage, the sum of the resistances RMEAS. and RL must be between 700 Ω and 1 kΩ.
