WatchGas | Klaverbaan 121 | 2908 KD Capelle aan den IJssel | The Netherlands | www.watchgas.com | [email protected]
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 fitted also incorporate 3 reed switches which can be
activated using external magnets through the glass window of the flameproof 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 software setup function.
The left 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 fitted 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.
