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temperature Temperature
temperature Pressure
temperature Luftfeuchtigkeit

Duct humidity and temperature sensors
with integrated pressure and differential pressure measuring transducer PREMASGARD® 814x - Modbus

Product group: WG02

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470,15 €
559,48 € incl. VAT + shipping


Duct humidity and temperature sensors
with integrated pressure and differential pressure measuring transducer PREMASGARD® 814x - Modbus
Maintenance-free microprocessor-controlled PREMASGARD® 814x - Modbus (Series) with Modbus connection, in an impact-resistant plastic housing with quick-locking screws, connection nozzles for pressure hose (Ø 6 mm), plastic sinter filter (exchangeable), optionally with/ without display, to exactly detect the relative humidity (0…100% RH) and the temperature (–35...+80 °C) in ducts and to measure the differential pressure (max. ± 7000 Pa) in air.

International system of units SI (default) can be switched to Imperial (via Modbus). Incl. mounting flange and connection set ASD-06 (2 m connecting hose, two pressure port nipples, screws).

The pressure sensor is applied to measure positive, negative or differential pressure in clean air and gaseous media. It is used in the clean room, medical and filter technology, ventilation and air conditioning ducts, spray booths, large-scale catering facilities, for filter monitoring and level measurement or for triggering frequency converters.

A long-term stable, digital humidity and temperature sensor and a pressure sensor with piezoresistive measuring element guarantee exact measurement results. These measurands are used to internally calculate the following parameters that can be retrieved via Modbus: temperature, relative humidity, dew point, absolute humidity, mixture ratio, enthalpy (ignoring atmospheric air pressure), differential pressure, volume flow, air density.
Innovative Modbus sensor with galvanically separated RS485-Modbus-interface, selectable bus termination resistance, DIP switch for setting the bus parameters and bus address in current-free state, internal LEDs for telegram status display, two separate push-in terminals and large three-line display (illuminated; with customised programming in the 7-segment and dot-matrix range). The sensor is factory-calibrated; an environmental precision adjustment by an expert is possible.

Technical details

Voltage supply
24 V AC (± 20 %) and
15…36 V DC
Power consumption
< 4.8 W/ 24 V DC typical; < 6.8 VA/ 24 V AC typical; peak current 200 mA
Data points
Temperature, relative humidity,
differential pressure
Measuring range, humidity
0...100 % RH
Operating range, humidity
0...95 % RH (without dew formation)
Deviation of humidity
typical ± 2.0 % (20…80 % RH); at + 25 °C, otherwise ± 3.0 %

Measuring range, temperature
–35...+80 °C
Temperature deviation
typically ± 0.2 K at +25 °C
Sensor protection
plastic sinter filter, Ø 16 mm, L = 35 mm, exchangeable
(optional metal sinter filter, Ø 16 mm, L = 32 mm)
Media temperature
–20...+50 °C
Pressure connection
with metal connection nozzles for pressure hose Ø 6 mm
(optional on request with quick connect
for PVC fabric pressure hose Ø 6 mm)
Type of pressure
differential pressure
Accuracy, pressure
Type 8148 (500 Pa): typically ± 13 Pa compared to calibrated reference device
Type 8147 (7000 Pa): typical ± 105 Pa compared to a calibrated reference device
Zero point offset
< ± 0.7 % of final value
Above- below-pressure
máx. ± 50 kPa
Ambient temperature
–30...+70 °C
clean air and
non-aggressive, non-combustible gases
Bus protocol
Modbus (RTU mode),
address range 0...247 selectable
Signal filtering
4 s / 32 s
Process connection
by mounting flange, plastic
(included in the scope of delivery)
Protective tube
PLEUROFORM, material polyamide (PA6), with torsion protection, Ø 20 mm, vmax = 30 m/s (air)
without filter: NL = 202.5 mm / with plastic filter: NL = 235 mm (optional with metal filter: NL = 227 mm)
Electrical connection
0.2 - 1.5 mm², via push-in terminal
Cable connection
cable gland, plastic (M 16 x 1.5; with strain relief, exchangeable, max. inner diameter 10.4 mm) or
M12 connector according to DIN EN 61076-2-101 (optional on request)
Housing dimensions
126 x 90 x 50 mm (Tyr 2)
Cable gland
2x M 16 x 1.5; including strain relief, exchangeable
Long-term stability
± 1 % per year
Sum of Linearity+hysteresis
< ± 1 % of final value
Media contacting parts
ms, Ni, Nylon, PU, Si, PVC with plasticisers
Temperature drift values
± 0.1 %/ °C
Temperature drift values
± 0.1 %/ °C
Protection class
III (according to EN 60 730)
Protection type
IP 65 (according to EN 60 529) housing only! (PLEUROFORM IP 30)
CE conformity,
electromagnetic compatibility according to EN 61326,
according to EMC Directive 2014/ 30/ EU