1592038700 Gas Leak Detector GB 16.09.2016
GDS41-GDS66-GDI41-GDI66
12/16
On power up, the semiconductors output over the + max scale (i.e., > 5V), move towards zero as
they stabilize.
If sensors have been in long-term storage or the detectors have been turned off for a long period,
stabilization is much slower.
However, within 1-2 hours sensors should have dropped below the alarm level and be operational.
You can monitor progress exactly by monitoring the 0-10V output. When the output settles around
zero the sensor is stabilized.
In exceptional circumstances the process can take up to 24 hours or more.
4.3 CONFIGURATION
FUNCTION
DESCRIPTION
Time delay
Available on the audible alarm and relay to avoid false alarms.
This is set with jumpers.
The default delay is 0 minutes.
You
may wish to set to 15 minutes during start up.
See figures above for setting the jumpers.
Audible Alarm
The units have an internal audible alarm.
You can disable this by jumper, but the
default setting is
“enabled”
in compliance withEN378.
See figures above for setting the jumpers.
Output
Decide which output is required: 4-20mA, 1-5V, 0-10V, relay
outputs, etc.
See figures above for setting the jumpers.
4.4 ADJUSTING THE ALARM SET POINT
This process is the same for all versions, using test points as the below specifications.
For the alarm adjustement:
Locate Pot P1 and use it to adjust the set point at which the relay activates.
Monitor the output between test points 0 (negative) and REF1 (positive) until the correct
setting is reached. See example below.
Example:
Gas Sensor with probe range 0-1000 ppm
Alarm set point 100 ppm
If you want to adjust the alarm set point you need to calculate the voltage Output (+V) as below:
So the alarm voltage setting is 0,5 Volts.
