dol sensors DOL 140 Manual

Technical User Guide
DOL 140 4-20 mA
Humidity Sensor
For other language variants of this document we refer to www.dol-sensors.com or
your local dealer.
dol-sensors a/s – Agro Food Park 15 – DK-8200 Aarhus N – T: [phone] – F: [phone] – www.dol-sensors.com

Technical User Guide
2www.dol-sensors.com DOL 140 4-20 mA
1 Product description
DOL 104 is a high-precision sensor for measuring relative humidity. It is intended for application in livestock
houses but is also well suited for a number of industrial applications.
The sensor features one analogue output with full protection against short-circuits and wiring failures.
The special sensor element and the built-in Teflon filter enable application in livestock houses with constantly
high humidity.
The sensor is microprocessor-controlled and has a two-color light emitting diode (LED) to communicate the op-
eration status and the error diagnostic.
2 Mounting guide
For optimum mounting of the sensor, use mounting clip or mount it free-hanging
in the cable.
The sensor element of the sensor requires free air passage.
Mount the sensor so it is not exposed to direct sunlight, as this would affect the
measurement.
Remember to put on a protection cap before mounting the cable.
3 Installation guide
Installation, servicing and troubleshooting of all electrical equipment must be carried out by quali-
fied personnel in compliance with the applicable national and international standard EN 60204-1
and any other EU standards that are applicable in Europe.
3.1 Connection of the sensor
Supply voltage
11-30 V DC
+ V (Brown)
+ GND (Blue)
% RH (White)

Technical User Guide
DOL 140 4-20 mA www.dol-sensors.com 3
LED/LIGHT PROTOCOL Functional graph
LED Status
Green Red
ON Operation OK
Flash Outside normal range
(below 10 % RH or exceeding 95 %
RH)
ON Connection error
Load error, see load graph
Flash Sensor defect
Over or under voltage alarm
Overload
4 Maintenance
Clean the sensor with water and a brush without using:
• High-pressure cleaner
• Highly compressed air
• Solvents
• Corrosive/caustic agents
• Alcohol-based disinfectants
During cleaning and disinfection, the sensor should be removed and the sealing plug for the ca-
ble should be mounted. Alternatively, the sensor protective cap can be mounted. The sensor
must be placed with the tip pointing upwards during disinfection.
After the sensor has been exposed to water and condensation, it requires a period where the relative humidity
is lower than 80 %RH in order for it to measure correctly.
Do not bend the sensor as this would inflict permanent damage on the electronics of the sensor.
5 Technical data
Measurement range % RH 0 - 100
Accuracy % RH ± 2% RH (40–85 %) ± 3% RH (10-95 %) at 0-40 °C
Output signal V 0.16 mA / % RH
Time constant T63 20 s at 0.5 m/s air speed
Supply voltage V DC 11 – 30
Max. current mA 35
Load See figure regarding load resistance and supply voltage
Max. output current mA 20
Cable 2 m 3 x 22 AWG / 0.34 mm2
Max. cable length 200 m 1.50 mm2
Temperature, operation and
storage
°C -40 to -60

Technical User Guide
dol-sensors a/s – Agro Food Park 15 – DK-8200 Aarhus N – T: [phone] – F: [phone] – www.dol-sensors.com
Protection class IP 67
Measurement, shipment mm 275 × 200 × 20
Shipment weight ex. connec-
tor
g 150
5.1 Load resistance and supply voltage
5.2 Dimensions
Dimensions in mm.
154
107.54
604240 • 2022-12-09 • en-US • Made in Denmark