KNX I4-ERD with TH-ERD

KNX Evaluation Unit for Ground Temp. / Humidity

The KNX I4-ERD evaluation unit monitors ground temperature and humidity. You can control an automatic watering system objectively with the data.
Up to four TH-ERD sensors can be connected to the evaluation unit. The two KNX I4-ERD threshold-value dependent switching outputs for humidity and temperature are available for each sensor channel.
KNX I4-ERD evaluation unit receives external readings via the bus and reconciles these to composite values with proprietary data. In this way, you can work with an overall temperature or an overall humidity reading for each channel.

N° 70310 KNX I4-ERD Evaluation unit for up to 4 sensors
N° 70312 TH-ERD Sensor for ground temperature and humidity


  • KNX I4-ERD (70310) KNX I4-ERD (70310)
  • TH-ERD (70312) TH-ERD (70312)

Evaluation unit KNX I4-ERD:

  • Reception of temperature and humidity information from up to four external sensors
  • Composite readings for each sensor channel variable from proprietary measured and external readings (percentage variable)
  • 2 threshold values per channel for temperature and humidity, can be adjusted per parameter or via communication objects
  • Configuration is performed using the KNX software ETS

Sensor TH-ERD:

  • Ground temperature measurement
  • Measurement of the ground humidity content
  • For connection to the KNX I4-ERD evaluation unit

Evaluation unit KNX I4-ERD:

HousingPlastic
ColourWhite
AssemblySeries installation on mounting rail
Protection categoryIP 20
Dimensionsapprox. 107 x 88 x 60 (W x H x D, mm), 6 modules
Weightapprox. 300 g
Ambient temperatureOperation -20…+70°C, storage -55…+90°C
Ambient humiditymax. 95% RH, avoid condensation
Operating voltage230 V AC, 50 Hz
Power consumptionapprox. 1.6 W without sensors,
approx. 2.8 W with 4 sensors
Poweron bus: 10 mA
Inputs4 x sensor inputs for KNX TH-ERD (+/-/A/B)
Max. cable length
Sensor inputs
100 m
Data outputKNX +/- Bus connector terminal
Communication objects129

Sensor TH-ERD:

ColourBlack (measuring surface green)
Protection categoryIP 68
Dimensionsapprox. 220 x 32 x 10 (W × H × D, mm),
lead length 10
Max. cable length 100 m
Weight approx. 250 g
Measurement accuracy of humidity volume share~ 1.5%, dependent on ground properties
Ambient temperature for temperature measurement-55...125°C
Ambient temperature for humidity measurement-10...0.70°C
Power consumption 65 mA for less than 1 second during measurement
Data output RS485