EHT Electronic Humidity Controller

This device automatically detects relative humidity and directly activates load equipment such as dehumidifiers or heaters to prevent condensation inside enclosures. It is preset to Normally Open (NO) mode for dehumidification; when humidity rises above the set threshold, the contact closes to activate the equipment. It supports a wide input voltage range of 100–270V, 50/60Hz, with a precise humidity setting adjustable in 5% increments. The unit includes a built-in status indicator LED and features frost protection with a fixed frost threshold set at 4°C.

Product Features

1. Featuring a sensing accuracy of 5% relative humidity (±3% error) at 25°C / 50% RH, this device provides two relay outputs rated at 8A 250V (note: the second contact is a potential-free dry contact), offers two selectable setting ranges (15–90% RH or 20–95% RH), and includes a five-pole terminal block for AWG 20–14 (0.5–2.5mm²) wiring with standard wire protection sleeves, with optional screwless terminals available.
2. The molded housing is designed for mounting on a 35mm DIN rail according to EN 60715 standards.

Specifications

Electronic humidity controller	EHT-2-220A
DBK Ordering Number	1150022	115023
Humidity setting range [RH]	15… 90% RH	20… 95% RH
Rated input voltage [V]	100-270 AC
Humidity setting difference (per level) [RH]	5% RH
Mode of contact	2 NO
Maximum switching capacity (relay output)	2 x 8A (240/120VAC resist.)
Sensing elements	Electronic
Connectivity (5 holes)	Screw AWG 20 -14 (0.5 - 2.5mm²) with wire protector
Dimensions (L x W x H) [mm]	49×65×61
Mounting bracket	Built-In clip for DIN rail EN 60715
Enclosure rating	IP20
Operating temperature [°C]	0 to 60
Storage temperature [°C]	-40 to 70
Electrical protection rating	II
enclosure	Plastic grey (RAL 7035)
weight	80
Anti-frost function	Yes (Operates below 4°C)