GDS XDI-15J User instructions

XDI (win)–15/30J (win)
TOXIC/OXYGEN  TRANSMITTER (PCB 337)
www.gds–technologies.co.uk
Technical Sheet ref C1882B
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 = 11mV across test
pins TP2/3, adjust gain pot RV4 for correct mV reading.
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
(when fitted) High alarm SPCO 0.5A @ 30Vdc
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)
Setting up a new transmitter utilising
GDS Terminal (download from GDS website)
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 J11. 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.
8. Press ‘Space Bar’ loads sensor information. Ensure jumper J17
is fitted before programming. Press (C) to enter Calibration
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.
10. Apply a known test gas to the sensor (e.g. 100ppm CO) for
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.
11. 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.
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
A
C
B
Tox u/ma
Can Sensor
PCB 337
J12
J4
RELAYS
DISPLAY
SENSOR
CELL
J17
D3D2
GAIN
J5
J14
J13
J15 +
-
RV2
J7 JTAG
VR1
S
J19
J18
J20
ZERO
GAIN
CONTRAST
ZERO
RV4
D9
TEST
J3
EOL
TP1
(W) (P) (Y)
ov
TP2
J1
TP10
J16
O2
O2
INV
D5
D10
PROG
ADD
4-20
J11
J10 J9
U14
TP3 4-20mA Pins (mV)
(Steps 2/3)
J9 + J10
(select sink/source)
GDS Terminal
Connection
(Micro USB B)
Gas Status LED
(Step 2)
Gain Pot 20mA
(Step 3)
Zero Pot
(Step 2) (4mA)
Insert jumper J16
when using Oxygen Cells
Fig. 1

This document is not contractual and the specification / detail may be modified at any time without prior notice.
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GDS Terminal Commands
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
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
K = Select Input Used to select the input from between Input J6 to input J14
(Toxic Only)
# = Local Relay Setup Used to change the function of the 3rd relay from
Fault to Over-Range
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 log Choose how many seconds between each
reading and whether the log will roll over or
stop at 2880 (60 second interval and 2880
readings = 48 hours)
Space Bar = Enter Data / Load Data Used to load sensor information after connecting to GDS Terminal
W = Set 4-20mA output Adjusts the digital 4-20mA Output values
* = Toggle Baud Rate Switches the Baud rate between 20kBits and 40kBits.
Using magnets or push buttons (set up)
continued
Removing both magnets as instructed on the LCD presents the first 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 display. 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, 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.
Using magnets or push buttons (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 timeout.
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 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 flashes when the sensor is inhibited. When all magnets are
removed, the display will revert to normal operation.
The left and right magnets together allow the calibration menu to
be used.
D E
E
An example of continuous data output to the PC from a Flammable
sensor is shown below and is the format for all gas types.
O, Hand L represent the Over Range High
and Low alarms respectively.
D indicates if a duplicate address is detected
Findicates a fault present
Ishows that this sensor has its alarms inhibited
under the OHLthe ^ ^ v represent the direction of the alarms. Lis falling
and Hand Oare rising. A(*) under the letter(s) OHLDFI represents a
detected state so in this example the sensor would be in high alarm and
a fault present.
‘Gas val 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) which will relist on the PC.
Flam %LEL
OHLDFI
^^v
-*--*-Gas val = 35.6
F
G
NOTE: for 2 Wire Direct
transmitters (PCB204)
document C894 see price list
G082 section M
Technical Sheet ref C1882B
XDI (win)–15/30J (win)
TOXIC/OXYGEN  TRANSMITTER (PCB 337)
Electrochemical cells
Control Unit
CAN 1 or 2
Sensor
4-Wire Addressable
CANbus
+24
Hi
Lo
0v
4~20mA
+24
Hi
Lo
0v
Control Unit Addressable Sensor PCB
+24V
Hi
Lo
0v
4~20mA
4~20mA O/P Sensor
(Any device)
4~20mA
+24V
0v
+24V
0v
4~20mA
+24V
Hi
Lo
0v
Control Unit
4~20mA Input
Sensor
3-Wire Direct
4~20mA Signal
Fig 2
Fig 3
Fig 4
+24
Hi
Lo
0v
4~20mA
+24
Sig
0v
W
Y
P
Control Unit
CAN 1 or 2
Sensor
Addressable
+24
Hi
Lo
0v
4~20mA
4~20 IN
SO
SK
+24
Hi
Lo
0v
Control Unit Addressable Sensor PCB
J10
+24V
Hi
Lo
0v
4~20mA
4~20mA O/P Sensor
4~20mA
+24V
0v
+24V
0v
4~20mA
+24V
Hi
Lo
0v
J11
Control Unit
4~20mA Input
Sensor
3-Wire Direct
4~20mA Signal
+24
Hi
Lo
0v
4~20mA
+24
Sig
0v
Control Unit
4~20mA Input
Sensor
2-Wire Direct
4~20mA Signal
+24
Hi
Lo
0v
4~20mA
+24
Sig
0v
4~20 IN
SO
SK
4~20 IN
SO
SK
J10
J10
J10