GDS 404+ Series Operating Handbook Download Page 20

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Fig. 10

XDI–XDIwin – 15/30J

PRIME SENSOR

Technical Sheet

ref C1698 Issue Bv.4

Power Supply

15 to 30Vdc 24v nominal

Outputs

3 wire 4~20mA / 4 wire CANbus
Relays

Low alarm SPCO

(when

High alarm SPCO

0–5A @ 30Vdc

fitted)

Fault alarm SPCO

Inhibit option during servicing

Logging Intervals – variable time

Roll over/stop

Storage – 2,880 readings

Requires RS232 lead

PC or laptop (dedicated)

Hyperterminal (download from GDS website)

Set up procedure:

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 anti–clockwise

(minimum voltage).

3. Connect sensor to J2 terminal W–white Y–yellow P–pink.
4. Connect 24V + and 0V to JP10, short the 4~20mA

terminal by inserting test link at J9.

5. 5. Measure the sensor voltage at SV and adjust by turning

sensor volts pot for the correct reading 4v DC.

DO NOT EXCEED THE REQUIRED VOLTAGE

OTHERWISE PERMANENT DAMAGE WILL OCCUR.

6. Rotate 20mA pot fully anti–clockwise (minimum span).
7. When in clean air the sensor bridge is zeroed by adjusting

zero pot until the dual colour LED D1 is off.

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 4mA pot for 4mA (zero) = 4mV

10. Then press (Z) on the PC to zero the reading.
11. Apply a known test gas to the sensor (50% F.S.D.) for 1

minute at a flow rate of 1 litre to give a 12mA = 12mV
across test pins TP8/9, adjust 20mA pot for correct mV
reading.

12. When using a PC press (S) to enter span mode and using

(H) or (L) adjust for the correct reading.

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 below and is the format for other
gas types.

and

represent the Over

Range High and Low alarms
respectively.

indicates if a duplicate address

is detected

indicates a fault present

shows that this sensor has its alarms inhibited

under the

O H L

the ^ ^ v represent the direction of the

alarms.

is falling and

and

are 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.

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 contrast 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

O H L D F I

^^v
–*––*–Gas val = 35.6