DOL 53 Manual

Technical User Guide
DOL 53
Ammonia 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 53
1 Product description
The DOL 53 is an electrochemical sensor designed to measure ammonia levels in livestock houses. The sen-
sor consists of a sensor element, a house, and a dust filter. The sensor element (sensor head) and filter can be
replaced as required, and the sensor element is supplied in a can for additional protection. Cable is included.
The sensor is meant for stationary mounting to measure the ammonia concentration continuously.
2 Product survey
140247 DOL 53 Ammonia sensor
DOL 53 measures the ammonia in the house's air.
Can be used for monitoring the ammonia level in the air.
140248 DOL 53 Replacement sensor head
Sensor element for DOL 53.
140236 DOL 53 dust filter (5 pcs.)
Dust filters for DOL 51 and DOL 53. Set of 5 pieces.
140238 DOL 53 protection against water
Kit for protection against water spray for DOL 53.

Technical User Guide
DOL 53 www.dol-sensors.com 3
140284 DOL 53 cable with connector (2 m)
2 meter wire with plug for DOL 53.
140285 DOL 53 test equipment gas, complete
Test equipment for NH3 measurement with DOL 51 / DOL 53.
140299 DOL 53 – test gas adapter
3 Installation
Mount the sensor in the mounting lug at the top of the sensor, filter facing down. The offset from vertical must
be max. 15o (see the illustration). DOL 53 must be mounted so that it is accessible in connection with mainte-
nance and must not be subjected to splash water.
Ensure free air passage around the sensor filter. Do not expose it to direct sunlight as this will affect the mea-
surements.
DOL 53 must warm up for half an hour before being ready to measure (see the section of LED indication).
The sensor must be placed in middle of the livestock house or in the center between walls/filters when used in
an air cleaner. Make sure there is an adequate distance to walls and air inlets.

Technical User Guide
4www.dol-sensors.com DOL 53
DOL 53 must not be suspended from the electric cable.
Figure1: DOL 53 must be mounted vertically with the sensor pointing down; +/- 15° at a location with low vibration and, as
far as possible, stable temperatures.
1Connector and coupling
2Mounting lug
3DOL 53 housing
4LED green/yellow
5Sensor element (140248)
6Dust filter (140236)
7Sensor lock ring
Figure2: DOL 53.
4 Connection
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.

Technical User Guide
DOL 53 www.dol-sensors.com 5
Power supply
18-30V DC
24V (White)
GND (Green)
0-100ppm NH3, 0-10V
(Brown)
Figure3: Connections.
Name Wire color Pin Connector
24V supply voltage White 1
0-100ppm NH3 Brown 2
GND Green 3
N/A N/A 4
5 Functionality
Figure4: Functional graph.
6 LED indication
LED indication Sensor status Action
YELLOW flashing
slowly
Incorrect electrical supply or inter-
rupted supply.
Check installation for cable break. Check the
power supply unit of the control unit. Check elec-
tric voltage in the junction box or at the sensor el-
ement with a multi-meter.
Short circuit in supply cable. Check installation for short circuit.
Overvoltage or undervoltage at the
sensor.
Check electric supply voltage at the sensor with a
multi-meter.
Incorrect voltage (e.g. 230 V AC)
applied, electronics damaged.
Replace the DOL 53 housing.

Technical User Guide
6www.dol-sensors.com DOL 53
LED indication Sensor status Action
DOL 53 housing is defective. Replace the DOL 53 housing, contact the sup-
plier.
Alternating GREEN
and YELLOW
Sensor is warming up to be
ready for measurements, signal
level 0 V.
No activity. Flashing stops after max. 30 minutes.
Constant GREEN
Normal operation.
GREEN flashing
quickly
The concentration of ammonia is
between 40-60ppm which is used
for testing the sensor. The sensor
is working but it thinks it is in test
mode.
No activity. Flashing stops after max. 5 minutes.
Constant YELLOW
Internal fault detected by electron-
ics, signal level 0 V.
Replace the DOL 53 housing.
YELLOW flashing
There is very little ammonia in the
livestock house - under -5ppm, the
sensor output is 0V.
Replace the sensor element, if the fault continues
for more than one day.
GREEN flashing
Concentration measurement is
above 105ppm outside the mea-
suring range.
Ventilate with fresh air.
GREEN/GREEN/
GREEN/YELLOW
Age monitoring, sensor element is
older than 3 years, service life is
expired, see date on sensor ele-
ment type plate.
Replace the sensor element.
7 Trouble shooting instructions
Error Cause Action
Packaging is damaged. Damage in transit. Contact the supplier in case the sensor
element is damaged.
No measurement on the control
unit.
Electrical connection faulty or in-
terrupted.
Check installation for cable break.
DOL 53 aligned incorrectly, not
vertical.
Install the sensor in accordance with
mounting instructions, vertical +/- 15°.
Sensor element is faulty or used
up.
Replace the sensor element.
DOL 53 housing is defective. Replace the DOL 53 house.
Incorrect measurement on the
control unit.
The dust filter is clogged. Replace the dust filter.
Check the sensitivity with test gas.
Unexpected measurement on
the control unit.
Brief interference pulses <5 sec-
onds.
Interference caused by electrical equip-
ment, e.g. lighting, fans or heaters. Iden-
tify device and suppress interference.
Unstable measured value. Dynamic signal fluctuations with
a period of more than 5 seconds
can arise from turbulence with
fresh air.
No activity, continue to monitor.
Wet sensor. DOL 53 was cleaned with water. Wipe DOL 53 dry.

Technical User Guide
DOL 53 www.dol-sensors.com 7
Error Cause Action
Condensation.
Black fluid is leaking from the
sensor element.
The sensor element is defective. Replace the sensor element.
8 Maintenance
The sensor element must be replaced after 3 years of operation at the latest, see date on the sensor element
type plate.
Carry out the daily visual inspection to detect operation readiness.
Have specialists carry out the annual inspection and sensitivity check.
Replace the dust filter in front of the sensor element, if clogged. A clogged filter prolongs the re-
sponse time of the sensor element. This affects the sensitivity. The dust filter must always be re-
placed prior to checking the sensitivity.
DOL 53 must be removed during cleaning and disinfection. After removing the connector, screw
on the sealing plug. A missing sealing plug leads to corrosion of the connector.
Cleaning
Clean the sensor surface with lukewarm water. Check for mechanical damage.
Transport
The sensor must be transported in the original packing in air traffic. Otherwise the sensor may
lose its measuring sensitivity.
9 Technical data
DOL 53, 0-10V, 0-100ppm NH3
Specification Parameter Unit
Output Voltage range 0 – 10 VDC
NH3 Measurement range 0 – 100 ppm NH3
Voltage resolution 0.1 V/ppm NH3
Signal transmission resolution 0.5 ppm NH3
Accuracy 1.5 ppm or +10% of the
measured value
ppm NH3
Long term drift < +10% of the mea-
sured value
%
Time constant: T50 < 30 sec.
Supply voltage 18 – 30 VDC
Supply current < 10 mA
Temperature, operation 0 – +50 oC
Temperature, storage -20 – +60 oC
Humidity 15 – 95 %RH

Technical User Guide
dol-sensors a/s – Agro Food Park 15 – DK-8200 Aarhus N – T: [phone] – F: [phone] – www.dol-sensors.com
DOL 53, 0-10V, 0-100ppm NH3
Pressure 700 – 1300 hPa
Max. storage time (sen-
sor element)
See date on sensor can
Warranty sensor element 2 years
Expected lifetime of
sensor element
Not beyond the date on the sensor
element type plate
3 years
IP classification IP65 (DIN 40050-9)
Cable length 2 m
Cable conductor size 3 x 0.25
(3 x AWG23)
mm2
Dimensions (diameter/width) 75 mm
Dimensions (length) 155 mm
Weight 500 g
Approvals CE
UKCA
9.1 Dimensioned sketch
Figure5: In mm.
604270 • 2021-12-21 • en-US • Made in Denmark