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IFM LDH290 air humidity sensor


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SKU: LDH290 Categories: , , Tag:


  • Simple monitoring of temperature and air humidity to protect electrical installations, control cabinets or production processes
  • Plug & Play thanks to screw or rail mounting
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Product characteristics
Number of inputs and outputs Number of analogue outputs: 2
Special feature Gold-plated contacts
Electrical data
Operating voltage [V] 12…30 DC
Protection class III
Reverse polarity protection yes
Power-on delay time [s] < 1
Measuring principle capacitive
Inputs / outputs
Number of inputs and outputs Number of analogue outputs: 2
Total number of outputs 2
Output signal analogue signal
Number of analogue outputs 2
Analogue current output [mA] 4…20
Max. load [Ω] (Ub – 12 V) / 20 mA
Measuring/setting range
Measuring range [% RH] 0…100
Temperature measurement
Measuring range [°C] -40…60
Accuracy / deviations
Accuracy [% RH] 4; (in the range 20…80 % RH)
Resolution [% RH] 0,1
Temperature measurement
Accuracy [K] ± 1
Resolution [K] 0.1
Response times
Response time [s] < 30; (T90)
Temperature measurement
Response time [s] < 300; (T90)
Operating conditions
Ambient temperature [°C] -40…70
Note on ambient temperature
application humidity: ≤ 90 % RH
non condensing
Storage temperature [°C] -40…85
Note on storage temperature
storage humidity: ≤ 90 % RH
non condensing
Protection IP 20; (only sensor: IP 57)
Tests / approvals
DIN EN 61000-6-2
DIN EN 61000-6-3
MTTF [years] 178
UL approval
File number UL E224228
Mechanical data
Weight [g] 72.3
Type of mounting DIN rail clip for 35 mm DIN rail (EN 60715); screw mounting; (M5)
Dimensions [mm] 140 x 40 x 38
Materials plastics UL94 V-0; light grey
Installation position vertical; connector facing upwards
Pack quantity 1 pcs.
Electrical connection
Connection Connector: 1 x M12 (EN 61067-2-101); coding: A; Contacts: gold-plated

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