GDS 404+ Series, Руководство по эксплуатации

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ALARM LEVEL ADJUSTMENT (LO/HI)
1. Alarm levels may be adjusted as follows: –
For toxic/flammable gases zero the instrument in clean air using the zero potentiometer (for ambient oxygen
monitoring the meter should be adjusted to read 20.8 using the s–span potentiometer).
2. Press the alarm set switch for approximately 2 seconds the sounder will bleep and the low alarm indicator will come
on, the green power indicator will turn off, release the alarm switch.
3. Using the zero potentiometer adjust the digital display for the required low trip level reading, press the alarm set
switch until the high alarm indicator comes on, release the alarm set switch.
4. Adjust the digital display to read the required high trip level reading and again press the alarm set switch both
alarm indicators will come on.
5. Zero the digital display (toxic/flammable) or 20.8 for oxygen and press alarm set switch, alarm indicators will turn
off and the green power indicator will turn on.
OVER–RANGE ALARM (OR) SET UP PROCEDURE
The screen displays all required information simultaneously as well as the sensor’s name/location with a maximum of
16 characters.
Over–range alarm (AL3) is set using the potentiometer on the front panel PCB labelled RL4. This is a global alarm
that applies to all four channels. One sensor zero level should be raised up to the desired alarm level by turning that
channel’s zero pot. The Alarm 3 set pot should then be turned until the third alarm just activates default setting (F.S.D).
The zero pot can then be adjusted back to normal setting.
There are jumpers for setting the third alarm level relay to be normally energised/de–energised (jumper fitted for
normally energised) and the alarm being latched/unlatched (jumper fitted for latched).
DISPLAY TEXT CHANGES
Gas type and units (8 characters), decimal places and sensor name/location are set up using a PC via a micro USB to
USB lead using GDS terminal or hyperterminal software.
Connect the front panel to a PC using a micro USB lead, this should auto–detect and appear as a com port, the number
of which can be found in windows ‘device manager’ ports for example. The terminal program should be set up using
the same method and settings as the GDS combi panel (baud rate 2400).
The terminal window will appear as below. Follow the onscreen instructions:
Press the character on the left of the list of commands to change that specific setting. The sensor name has 16 available
characters and the gas type has 8.