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Combi / XDI-XDIwin Flammable Sensor
Set up procedure: 198D1C Issue P.v1
Data Sheet
ref C893
NEW SENSORS ARE SUPPLIED READY TO CONNECT TO THE SYSTEM.
The following procedure is for full set up and where the sensor cell has been replaced - only sections 5, 6, 7, 9 and 11
need to be carried out. Voltage measurements are made wrt AG unless otherwise specified.
1. Insert jumpers J20 and J6 position SO for 4-20mA source output.
2. Turn sensor voltage potentiometer RV4 fully anti-clockwise (minimum voltage).
3. Connect sensor to J2 terminal W-white P-pink Y-yellow.
4. Connect 24v + and 0V to JP9, short the 4~20mA terminal by inserting JP4.
5. Measure the sensor voltage at SV and adjust by turning RV4 clockwise.
(standard sensor CAT300 = 2VDC.) DO NOT EXCEED THE REQUIRED VOLTAGE OTHERWISE PERMANENT
DAMAGE WILL OCCUR.
6. Rotate RV2 fully anti-clockwise (minimum span.)
7. The sensor bridge is zeroed by adjusting RV3 until the dual colour led D1 is off. (Or voltage V0 is 0.0v)
8. Connect PC hyper terminal using RS232 Combi adaptor (part no. 160-510 and lead part no. 160-515) at 4800
baud connected to J3 and initialise the sensor using (C) calibration mode, then shift + ($) command from the
keyboard.
9. Using a digital mV meter measure across test pins TP8/9 and adjust RV1 for 4mA (zero) = 4mV
10. Then press (Z) on the PC to zero the reading.
11. Apply a known test gas to the sensor (56% LEL = 2.5% vol methane) for 1 minute at a flow rate of 1 litre to give a
13mA = 13mV across test pins TP8/9, if necessary adjust potentiometer 20mA pot RV2.
12. When using a PC press (S) to enter span mode and using (H) or (L) adjust the reading to 56% LEL.
13. Press (space) to exit span and then (X) to exit the calibration mode.
An example of continuous data output to the PC from a
Flammable sensor is shown opposite and is the format for all gas types.
O represents the Over range alarm and H and L the High and Low.
D shows that duplicate address is detected
F indicates a fault present
I shows that this sensor has its alarms inhibited
under the O H L the ^ ^ v represent the direction of the alarms. L is falling and H and O are rising. A* under the letter
represents a detected state so in this example the sensor would be in high alarm and a fault present.
35.6 represents the value of the gas present at the sensor head. Pressing (R) on the PC causes a reset to occur.
Gas type with address and serial number are then output to the PC together with alarms and calibration date.
A full command list via PC is available by pressing the letter P will relist on the PC keyboard.
14. Connect the sensor to a Combi alarm panel and ensure that it reports in correctly.
Note:- Fit the end of line (EOL) link J1 if the sensor is to be installed at the end of the sensor cable.
15. If front panel display board is fitted via connector J5 and U12 adjust VR1 for LCD contrast.
16. Remove J9 test link for normal operation.
17. Insert link J12 to enable the bridge fault detection. (4-20mA output falls to 2mA in fault).
18. Ensure J29 address link is removed (this is only used when changing address from a Panel)
Flam %LEL
OHLDFI
^^v
-*--*-Gas val = 35.6
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 Use when calibration gas applied,
H and L change reading
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
C = Clear sensor data logger An internal data logger is wiped (not in use)
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
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