22 | Operating Manual GW 702 | Analogue Output and Interface
11. Analogue Output and Interface
Measured value display
Basic settings
Analogue output
No. of RS 485
0.09 ppm 0.01 ppm
Sens. 1 Sens. 2
Sensor 1
Sensor 2
Analogue
output
Language
No. of RS 485
Select Alarm
0/4 mA Select
Output
Sens. 1 or 2
Bus Address
No. 00
11.1 Analogue output
Via the analogue output you can read out the measured values of a sensor, sensor 1 or 2, as 0/4 … 20 mA
signal. With the setting 4 … 20 mA the resolution is indeed lower, but defective cable connections can be
detected immediately.
Measured value display
Main Menu
Basic Settings
Analogue Output
Select between 0 … 20 mA and 4 … 20 mA.
Select between Sensor 1 and Sensor 2.
11.2 Interface
The units are optionally available with an RS 485 interface. This is used for service purposes only.
12 Check function
Perform operational checks of the sensor and alarm threshold limits upon commissioning. The operational
check involves checking the sensor and the amplifier switch points with the gas used.
Perform the following checks:
• Check the sensor using a sensor test.
• Operational check of the switching steps for alarm activation. For this the sensors are to be impinged
on with test gas with a concentration above limit value 2.
• Operational check of the relay contacts.
• Operational check of the optical and acoustic warning devices.
