WatchGas XDI Series Instruction Manual

WatchGas | Klaverbaan 121 | 2908 KD Capelle aan den IJssel | The Netherlands | www.watchgas.com | [e-mail]
XDI WIN/J WIN
TOXIC/OXYGEN  TRANSMITTER
PCB  UPGRADE FROM PCB 
Technical Sheet ref C1882A v2.0
SET UP PROCEDURE
Direct Sensor – 3 wire - 4~20mA
New sensors are supplied ready to connect to a system with all jumpers inserted. This procedure shows
how to recalibrate as part of routine maintenance or cell replacement.
The rst part is to set up the 4-20mA section which is produced by the CELL circuit. Note some cells take
time to stabilise. If used as 3 wire, only steps 1 to 5 are required.
1. Connect the cell to terminal J14 and use +24V, 0V and 4~20mA connections on terminal J2 for 3 wire.
2. Measure the output current mV=mA at test pins TP2/TP3 and adjust reading to 4mA using the Zero pot.
LED D9 will go green.
3. Apply span gas to cell and adjust Gain pot to give correct mV reading at test pins TP2/TP3.
NOTE: at 50% span gas, the mV reading at TP2/TP3 should be 12mV.
4. Remove the span gas and re-adjust Zero pot to 4mV if required.
4 wire CANbus / 3 wire 4~20mA with processor communication
5. With power applied ensure that MPU led is ashing and the CAN led is on or ashing.
6. Connect USB-A to USB Micro B lead to J11 connector and to a PC running GDS Terminal at 4800 baud.
Ensure jumper J17 is tted before programming.
7. The terminal output screen shows continuous data output/ commands and allows input from the PC
keyboard.
8. Select COM Port – Note each new sensor connected requires a new COM Port to be connected to.
9. Press ‘Space Bar’ loads sensor information.
10. Press ‘C’ enters calibration mode
11. Press ‘G’ to change the gas type to match the cell being used. NOTE: the range of the new gas has a
default value but can be changed by pressing ‘R’.
12. Press ‘A’ to change the address of this sensor if required.
13. Press ‘N’ to select the number of decimal places to 1 or 2, (ie: dp=1 or dp=2)
14. When in clean air, the sensor is zeroed by adjusting ‘Zero’ pot until LED ‘D9’ goes green, 4mA should
be present on ‘TP2’ and ‘TP3’.
15. Then apply span gas and press ’S’ to enter span mode, obtain correct mV reading for test gas used by
adjusting ‘Gain Pot’. The displayed reading can be made HIGHER by pressing ‘H’ LOWER by pressing ‘L’
NOTE: This changes the mA reading on TP2/TP3. E.g. half range calibration gas = 12mV on TP2/3.
OUTPUTS
3 wire 4~20mA output
4 wire CANbus
Relays Low alarm SPCO
High alarm SPCO 0-5A@ 30v DC
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)
Electrochemical cells
POWER SUPPLY
15 to 30vDC 24v nominal

WatchGas | Klaverbaan 121 | 2908 KD Capelle aan den IJssel | The Netherlands | www.watchgas.com | [e-mail]
COMMAND USE
A = Set CAN address Sets the CAN address
G = Select gas type Select the gas type from a list
Z = Zero Press when no gas on sensor to give zero
S = Span
H and L change reading Use when calibration gas applied
D = Enter calibration date Enter the calibration date
Y = Toggle auto zero Auto zero is ON or OFF, small drift is cleared
H = Set high alarm Sets the high alarm threshold
L = Set low alarm Sets the low alarm threshold
O = Set over range alarm Sets the over range alarm threshold
P = List command List these commands on screen
X = Exit calibration mode Exit this PC mode
$ = Initialise this sensor Use on new PCB to set gas type to Flam
U = Alarm direction Sets rising or falling alarms
R = Range Allows a change in maximum value
N = Decimal points Toggles between 1 and 2 decimal places
E = Edit user gas text Choose gas description
B = Toggle deadband Deadband of 2.5% can be on or off
F = Toggle fault Input External fault input contact can be disabled
# = Normally energised Low /high alarm relays and fault relay can be made normally energised
V = View gas log From current log, display how many historical readings to display, up
to 2880
% = Clear gas log Set all 2880 log readings to 0.00
I = Log interval
Choose how many seconds between each log reading and whether the
log will roll over or stop at 2880 (60 second interval and 2880 readings
= 48 hours)
W = Set 4~20mA output
* Toggle Baud Rate 20kBits/40Kbits
USING MAGNETS SET UP
The Combi sensors which have an LCD display tted also incorporate 3 reed switches which can be
activated using external magnets through the glass window of the ameproof XDIwin enclosure. These
magnets do not act instantly and have to be in close proximity to L, M and R on the front display for a few
seconds to activate a soware setup function.
The le magnet enters the Auto zero ON or OFF menu. This allows small drift changes in the sensor to
be compensated for but is not operational when the sensor readings are greater than 5% of full scale.
Therefore auto zero is inactive when a larger gas reading is present. When the remove magnets message
appears, move the left magnet away and then the display shows if auto zero is ON or OFF. The left magnet
puts auto zero on and the right magnet turns it off. With no magnets present, the display will return to
normal after a few seconds time out.
16. Pressing ‘SPACE BAR’ will exit the span mode
17. Press ‘V’ to view log of sensor readings if required
18. Pressing ‘X’ will exit the calibration mode.
NOTE: Oxygen cells only use the P+ and Y terminals J14. To adjust for “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% oxygen the span can be adjusted for 17.4mA
reading across the same test pins using gain pot.
If an LCD option is tted then calibration and other settings using magnets instead of a PC can be
achieved – see over.
19. On completion and when used as an addressable sensor, future calibrations may be carried out at the
Combi alarm panel.

WatchGas | Klaverbaan 121 | 2908 KD Capelle aan den IJssel | The Netherlands | www.watchgas.com | [e-mail]
The right magnet allows the CAN address of the sensor to be changed. WHEN the ADDRESS menu is
displayed with a prompt to remove the magnet, and then the display shows the address and that the right
magnet will decreases it whilst the left magnet will increase it. This is then stored in internal non volatile
memory and the display will automatically revert to normal operation.
The centre magnet is used to inhibit the sensor. As with the left and right magnet functions the display
requests that you remove the magnet and then the state of the inhibit appears on the LCD. The left magnet
then puts the sensor into inhibit whilst the right magnet removes it. An amber LED on the front panel
under the LCD ashes when the sensor is inhibited. When all magnets are removed, the display will revert
to normal operation.
The le and right magnets together allow the calibration menu to be used.
Removing both magnets as instructed on the LCD presents the rst part of this multi menu which is ZERO.
With no gas present use the left magnet to increase the reading and the right magnet to decrease to
achieve a zero reading on the displays. A timer is displayed on the LCD and when this reaches 0, the next
menu is displayed. This timer is 15 seconds approximately and is reset back each time a magnet is near.
This timeout can be speeded up by placing a magnet near to the centre position.
SPAN is the next part of the menu and gas should be applied to the sensor at this time.
The left magnet increases the gain and the right magnet reduces gain. The actual sensor value can be seen
on the display to rise or fall respectively.
LOW ALARM is the next menu and left and right magnets increase and decrease this value.
HIGH ALARM is next followed by over range alarm.
The direction of the alarms is displayed as ^ for rising and v for falling but these can be changed using left
and right magnets together.
WatchGas Technical Sheet ref C1882A v2.0 07-10-22 ©2022 WatchGas B.V.
WatchGas is dedicated to continuously improving its products. Therefore, the specications and features mentioned in this datasheet are subject to change without prior notice.