GDS XDI-15J Setting Up

XDI win –15/30J
( )
TOXIC/OXYGEN – TRANSMITTER
Electrochemical cells
Setting up a pre calibrated Transmitter
(Cell replacement)
New sensors are supplied ready to connect to the system with all jumpers
inserted. This procedure shows how to recalibrate as part of a routine
maintenance or cell replacement.
1. If bench testing the PCB see section B3
2. Using a digital mV meter measure across test pins TP2/3 and
adjust Zero pot RV2 until LED D9 goes green for 4mA (zero) = 4mV
(sensor bridge zero) see B9
3. Apply a known test gas to the sensor (e.g. 100ppm CO) for 1
minute at a flow rate of 1 litre to give a 13mA = 1 1mV across test
pins TP2/3, adjust gain pot RV4 for correct mV reading.
TP1
ov
ADD
(W)
J12
D2 D3
CONTRAST
U14
VR1
RV2
ZERO
Zero Pot
(Step 2) (4mA)
J14
TP10
J13
J16
O2
J15
+
Insert jumper J16
when using Oxygen Cells
Power supply
15 to 30Vdc 24v nominal
Outputs
3 wire 4~20mA Direct (WPY)
4 wire CANbus (Addressable) 4~20mA (Y)
Relays Low alarm SPCO
High alarm SPCO
(when fitted)
Fault alarm SPCO
Inhibit option during servicing
Logging Intervals – variable time
Roll over/stop
Storage – 2,880 readings
Requires USB A to USB micro B cable
PC or laptop (dedicated)
GDS Terminal (download from GDS website)
win
(
(PCB 337)
Fig. 1
(P) (Y)
TP3
TP2
J4
J3 J1
TEST
EOL
RELAYS
Tox
u/ma
Can Sensor
PCB 337
D5
J17
DISPLAY D10
J7 JTAG
J11
GAIN
J19
J5
J18
D9
- O2
RV4
INV
Gas Status LED
SENSOR GAIN
(Step 2)
CELL
Gain Pot 20mA
(Step 3)
0.5A @ 30Vdc
)
A
Setting up a new transmitter utilising
GDS Terminal
1. Insert jumpers J10 and J9 position SO for 4-20mA source
output.
2. Connect sensor to J14 terminal W-white Y-yellow P-pink.
3. For bench setup only – connect 24V + and 0V to J2, connect
jumper to J1 (4~20mA output test load) remove after set up.
4. Rotate Gain pot fully anti-clockwise (minimum span.)
5. When in clean air the sensor bridge is zeroed by adjusting
zero pot until LED D9 is Green.
6. Connect PC to sensor via GDS terminal using USB-A to USB
Micro-B cable at 4800 baud connected to J1 1. The terminal
output screen shows continuous data output/ commands and
allows input from the PC keyboard.
7. Select COM Port – Note each new sensor connected to
requires a new COM Port to be connected to.
J9 + J10
8. Press 'Space Bar' loads sensor information. Ensure jumper J17
(select sink/source)
is fitted before programming. Press (C) to enter Calibration
4-20mA Pins (mV)
(Steps 2/3) Mode, and Press ($) to initialize the sensor.
To update firmware contact GDS.
Press W to set 4-20mA parameters, use (L) and (H) to adjust
4mA, Press 'Space' to set, use (L) and (H) to adjust the 20mA,
press 'Space' to set.
9. Then press (Z) on the PC to zero the reading.
S
GDS Terminal
10. Apply a known test gas to the sensor (e.g. 100ppm CO) for
Connection
(Micro USB B)
1 minute at a flow rate of 1 litre to give (e.g 12mV = 12mA)
across test pins TP2/3, adjust gain pot for correct mV reading.
1 1. When using a PC press (S) to enter span mode and using (H)
or (L) adjust the reading. Note – This adjusts the mA reading on
TP2/3 when adjusted.
12. Press (space) to exit span and then (X) to exit the calibration
mode.
13. Connect the sensor to a Combi alarm panel and ensure that it
reports in correctly. Note: Fit the end of line (EOL) link J3 if the
sensor is to be installed at the end of the sensor cable.
14. If the sensor is fitted with a display – adjust the contrast using
'VR1' pot.
C
15. Remove J1 test link for normal operation, (this does not need to
be removed when used as an Addressable sensor)
16. Ensure J17 address link is removed (this is only used when
changing address from the alarm panel).
17. On completion and when used as an addressable sensor,
future calibrations may be carried out at the Combi alarm
panel.
NOTE: Oxygen cells only use the P+ and Y terminals J14.
To adjust for the 'Zero' it is normal practice to disconnect the green
connector on J14 and adjust the Zero pot until LED D9 is green and
4mA across TP2/TP3. When the cell is reconnected in air at 20.9%Vol
oxygen the span can be adjusted for 17.4mA reading across the same
test pins using the gain pot.
If an LCD option is fitted then calibration and other settings using
magnets instead of a PC can be achieved. See over.
See Reverse for Full list of GDS Terminal Commands
Technical Sheet ref C1882B
(download from GDS website)
www.gds–technologies.co.uk
B