Product description
- 0...100 % RH (Humidity) – 35...+80 °C / – 31...+176 °F (Temperature)
- Modbus
- Protection type: IP 65
Calibratable dew point control switch HYGRASGARD® TW-Modbus-SD, with Modbus connection (Y-adapter), in an impact-resistant plastic housing with quick-locking screws, to exactly detect the relative humidity (0…100% RH) and the temperature (– 35...+80 °C/ – 31...+176 °F) and to detect various parameters in humidity measurement.
The dew formation in particular is reliably determined thanks to its patented measuring method, the pro-dynamic cross-convection (no conductivity measurement).
International system of units SI (default) can be switched to Imperial (via Modbus).
The surface-contact sensor is applied in a non-aggressive, dust-free environment and is suitable for installation in ceilings, ducts and devices.
It is used in the refrigeration, air conditioning and clean room technology, engineering rooms, hotels and conference facilities.
A long-term stable, digital humidity and temperature sensor guarantee exact measurement results.
These measurands are used to internally calculate the following parameters that can be retrieved via Modbus: relative humidity, absolute humidity, mixture ratio, dew point, enthalpy (ignoring atmospheric air pressure) and ambient temperature.
Modbus sensor SD with RS485 Modbus interface (not galvanically isolated), selectable bus termination resistance, DIP switch for setting the bus parameters and bus address in current-free state, internal LEDs for telegram status display.
Uses internal diagnostics to detect sensor breakage or sensor short circuit as errors.
The sensor is factory-calibrated; an environmental precision adjustment by an expert is possible.
Technical data
| Voltage supply | 24 V AC (± 20 %) and 15…36 V DC (± 10 %) |
| Power consumption | < 1.0 W/ 24 V DC < 2.2 VA/ 24 V AC |
| System of units | SI (default) or Imperial (switchable via Modbus) |
| Data points | Temperature [°C] [°F] Relative humidity [% RH] Dew point [°C] [°F] Absolute humidity [g/m3] [gr/ft3] Mixing ratio [g/kg] [gr/lb] Enthalpy [kJ/kg] [Btu/lb] |
| Sensor | digital humidity sensor with integrated temperature sensor low hysteresis high long-term stability |
| Measuring range, humidity | 0...100 % RH (Humidity) – 35...+80 °C / – 31...+176 °F (Temperature) |
| Accuracy in humidity | typical ± 2.0 % (20...80 % RH) at +25 °C otherwise ± 3.0 % |
| Accuracy temperature | typical ± 0.6 K at +25 °C |
| Zero point offset | ± 10 % RH (Humidity) ± 10 K (Temperature) |
| Ambient temperature | –30...+70 °C |
| Medium | clean air and non-aggressive non-combustible gases |
| Bus interface | RS 485 not galvanically isolated bus termination activatable via DIP switches. Up to 32 devices possible in one segment. In case of a greater number of devices RS485 repeaters must be used. |
| Bus protocol | Modbus (RTU mode) address range 0...247 selectable |
| Baud rate | 9600 19200 38400 Baud |
| Status display | LED green = Telegram valid LED red = Telegram error |
| Signal filtering | 4 s / 32 s |
| Housing | Plastic UV-resistant material polyamide 30 % glass-globe reinforced with quick-release screws (slotted/ Phillips head combination) colour traffic white (similar to RAL 9016) |
| Housing dimension | 72 x 64 x 37.8 mm (Tyr 1 without display) |
| Cable connection | Cable gland plastic 2x M 12 x 1.5 (Y-adapter) with strain relief exchangeable max. inner diameter 6 mm |
| Electrical connection | 0.14 - 1.5 mm2 via terminal screws |
| Process connection | TW - xx endless strap with metal tightener 300 mm for pipes up to 3 „ diameter (included in the scope of delivery) TW - xx - externl cable tie 200 mm (included in the scope of delivery) |
| Sensor protection | Membrane filter |
| Mounting | TW - xx with strap for direct mounting on pipes or for direct mounting on flat surfaces (e.g. walls, ceilings) TW - xx - extern with detached sensor head (cable length KL = 2 m) for mounting on pipes |
| Long-term stability | ± 1 % per year |
| Permissible humidity | < 95 % RH non-precipitating air |
| Protection class | III (according to EN 60 730) |
| Protection type | IP 65 (according to EN 60 529) Housing tested TÜV SÜD Report No.713139052 (Tyr 1) |
| Standards | CE conformity according to EMC Directive 2014/ 30/ EU |
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