1. Introduction
The DGS sensor is calibrated at the factory.
A calibration certificate is delivered with the sensor.
After installation the zero calibration and recalibration (gain calibration) should be executed only in
case the sensor has been operating longer than the calibration interval or has been in stock longer
than the storage time exposed in the below table:
Caution:
• Check local regulations on calibration or testing requirements.
• The DGS contains sensitive electronic components that can be easily damaged. Do not touch nor
disturb any of these components while lid is removed and when replacing it.
Important:
• If the DGS is exposed to a large leak it should be tested to ensure correct functionality by resetting
the zero setting and carrying out a bump test. See procedures below.
• To comply with the requirements of EN378 and the European F-GAS regulation, sensors must be
tested at least annually.
Anyway, the frequency and nature of testing or calibration may be determined by local regulation
or standards.
• Failure to test or calibrate the unit in accordance with applicable instructions and with industry
guidelines may result in serious injury or death. The manufacturer is not liable for any loss, injury, or
damage arising from improper testing, incorrect calibration, or inappropriate use of the unit.
• Before testing the sensors onsite, the DGS must have been powered up and allowed to stabilize.
• The testing and/or calibration of the unit must be carried out by a suitably qualified technician, and
must be done:
– in accordance with this guide.
– in compliance with locally applicable guidelines and regulations.
Recalibration and part replacement in the field maybe implemented by a qualified technician and
with the appropriate tools. Alternatively, the easily removable sensor element may be replaced.
There are two concepts that need to be differentiated:
• bump test or functional test
• calibration or re-calibration (gain calibration)
Bump test:
Exposing the sensor to a gas and observing its response to the gas.
The objective is to establish if the sensor is reacting to the gas and all the sensor outputs are working
correctly.
There are two types of bump test
• Quantified: using a known concentration of gas
• Non-quantified: using and unknown concentration of gas
Calibration:
Exposing the sensor to a calibration gas, setting the “zero” or standby voltage to the span/range,
and checking/adjusting all the outputs, to ensure that they are activated at the specified gas
concentration.
Caution
(before you carry out the test or calibration)
• Advise occupants, plant operators, and supervisors.
• Check if the DGS is connected to external systems such as sprinkler systems, plant shut down,
external sirens and beacons, ventilation, etc. and disconnect as instructed by the customer.
Product
Calibration interval
Storage time
Spare sensor DGS-IR CO2
60 months
approx. 6 months
Spare sensor DGS-SC
12 months
approx. 12 months
Spare sensor DGS-PE Propane
6 months
approx. 6 months
Operating Guide | DGS functional tests and calibration procedure
2 | AQ430229665343en-000101
© Danfoss | Climate Solutions | 2022.10
