Senseca HD2717T Series Active Temperature and Relative Humidity Transmitters with Interchangeable Probes
Senseca HD2717T Series Active Temperature and Relative Humidity Transmitters with Interchangeable Probes
Senseca HD2717T Series
The Senseca HD2717T Series consists of active transmitters, indicators, and ON/OFF controllers with data logging functionality, designed for measuring temperature and relative humidity.
A key feature of the series is the interchangeable probe, which can be replaced by the user without interrupting the process. This allows the probe to be removed for later calibration or repair without shutting down the measurement system.
The instruments are available in different configurations: with a horizontal S.TO probe, a vertical S.TV probe, or a remote S.TC probe connected to the electronics by a cable of various lengths. The S.TO and S.TV probes are made of AISI 304 stainless steel, while the S.TC probes are available in either AISI 304 stainless steel or plastic material.
Each probe is factory calibrated and ready to use. It is equipped with a SICRAM2 module that stores the probe calibration data and enables interchangeability between compatible probes.
The instruments measure temperature in °C or °F and relative humidity, and also calculate absolute humidity, mixing ratio, and dew point temperature.
All models provide both current and voltage analog outputs. Some versions are equipped with two control relays and one alarm relay, configurable by the user. All models include a multistandard RS232/RS485 serial interface and an auxiliary RS232C serial output. The RS485 interface allows multiple instruments to be connected and managed within a communication network.
The data logging function allows measured values to be stored using a selectable logging interval.
The series supports several probe configurations. The S.TV vertical probe has a length of 130 mm and is made of AISI 304 stainless steel. The S.TC remote probes are available with probe lengths of 135 mm or 335 mm and cable lengths of 2, 5, or 10 m. They can be supplied in AISI 304 stainless steel, in HT high-temperature versions for operation up to 150 °C or 170 °C, or in PBT versions.
The S.TO1 and S.TO2 horizontal probes have lengths of 135 mm and 335 mm, respectively. Special cabled probes are also available for measurements in pipelines, including S.TC2.480.2 and S.481.2.
The Senseca HD2717T Series is suitable for applications requiring continuous monitoring, local indication, control, data logging, and easy replacement of the measurement probe without interrupting the process.
For more information:
HD2717T... Series - Interchangeable Probe Active Transmitters - Humidity, Temperature - Senseca
Technical Specifications – Senseca HD2717T Series
Specification conditions: 24 V AC and 20 °C
Inputs
| Parameter | Value |
|---|---|
| Temperature Sensor | Pt100 |
| Temperature Measuring Range | -50 to +200 °C |
| Relative Humidity Measuring Range | 0–100 %RH |
| Dew Point Temperature | -50 to +100 °C |
| Absolute Humidity | 0–600 g/m³ |
| Mixing Ratio | 0–2000 g/kg of dry air |
| Wet Bulb Temperature | -50 to +100 °C |
Accuracy of Measured Quantities
| Parameter | Accuracy |
|---|---|
| Temperature, Pt100 | ±0.25 °C |
| Relative Humidity | ±1.5 %RH at 0–90 %RH and T = 15–35 °C; ±2.0 %RH over the remaining RH range at T = 15–35 °C; ±(1.5 + 1.5% of measured value) %RH over the remaining temperature range |
Accuracy of Calculated Quantities
| Parameter | Value |
|---|---|
| Dew Point Accuracy at T = 20 °C | ±2 °C DP at -40 to -20 °C DP; ±1.5 °C DP at -20 to 0 °C DP; ±1 °C DP at 0 to +20 °C DP |
| Response Time | 3 min with filter, at 20 °C and air velocity of 0.5 m/s |
Special Probes S.TC2.480.2 and S.481.2
The specifications above also apply to S.TC2.480.2 and S.481.2 probes, intended for humidity measurement in pipelines, with the following exceptions:
| Parameter | S.TC2.480.2 / S.481.2 |
|---|---|
| Temperature Measuring Range | -40 to +60 °C |
| Dew Point Measuring Range | -40 to +60 °C |
| Dew Point Accuracy at T = 20 °C | ±2 °C DP at -40 to 0 °C DP; ±1 °C DP at 0 to +20 °C DP |
| Operating Temperature | -40 to +80 °C |
| Operating Pressure – S.TC2.480.2 | 0–16 bar |
| Operating Pressure – S.481.2 | -1 to 8 bar |
Outputs and Communication
| Parameter | Value |
|---|---|
| Communication Interfaces | RS232C and RS485 Multidrop |
| Baud Rate | 9600 baud |
| Temporary Configuration Baud Rate | 57600 baud, non-permanent |
| Measured Quantities | Temperature, relative humidity |
| Calculated Quantities | Absolute humidity, mixing ratio, dew point, wet bulb temperature |
Analog Outputs
| Parameter | Value |
|---|---|
| Number of Analog Outputs | 2 for HD2717T...; 3 for HD2817T... |
| Output Types | 4–20 mA; 0–20 mA; 0–10 V DC; 2–10 V DC |
| Load Resistance – Current Output | 500 Ω max. |
| Load Input Resistance – Voltage Output | 100 kΩ min. |
| Resolution | 16 bit |
| Accuracy | ±0.05% full scale at 20 °C |
Relay Outputs
| Parameter | Value |
|---|---|
| Control Relays | 2 × SPDT |
| Control Relay Rating | 3 A / 250 V AC, resistive load |
| Alarm Relay | 1 × SPST, normally open |
| Alarm Relay Rating | 3 A / 250 V AC, resistive load |
Instrument Specifications
| Parameter | Value |
|---|---|
| Power Supply | 24 V AC/DC ±10% or 90–240 V AC, depending on model |
| Mains Frequency | 50–60 Hz |
| Average Power Consumption | 3 W |
| Data Logger Capacity | 9000 samples in max. 256 sessions |
| Memory Type | Circular memory |
| Stored Parameters | All parameters and output status |
| Logging Interval | 1, 2, 5, 10, 20, 60 s; 2 and 4 min |
| Internal Clock | Real-time clock with lithium backup battery |
| Clock Accuracy | ±1 min/month |
Operating Conditions
| Parameter | Value |
|---|---|
| Operating Temperature | -20 to +60 °C |
| Operating Relative Humidity | 0–90 %RH, non-condensing |
| Maximum Static Operating Pressure of Sensors | 12 bar |
| Storage Temperature | -30 to +80 °C |
| Weight | 600 g |
| Housing Material | ABS |
| Protection Rating | IP65 |
Technical note: The source specification distinguishes between 2 analog outputs for HD2717T... and 3 analog outputs for HD2817T.... This distinction has been preserved exactly as stated in the original specification.