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GDS TECHNOLOGIES LTD
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FUSION POINT
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ASH LANE
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GARFORTH
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LEEDS
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LS25 2GA
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UK
www.gds-technologies.co.uk
Technical Sheet
ref C1519B
XDI-XDIwin – 15/30J
SEMICONDUCTOR SENSOR
Set-up Procedure: 292 D7C Issue Bv3
•
NEW SENSORS ARE SUPPLIED READY TO CONNECT AND GO
BUT NEED 15 MINUTES POWER STABILISATION. The following procedure is
for full set up using a PC but onsite calibration without PC/LCD requires only
sections 18 & 19.
Note:
If a new cell is fitted then full calibration is required.
PC setup
This sensor will linearise 2 points, zero and mid-scale with an optional full scale point when using a PC.
Gas values below the mid-scale point are not as accurate because the sensor is none linear.
The Zero adjust is continuous during power up inhibit time and PCB fault LED flashes to indicate this, do
not apply any gas at this time because Zero adjust will try to offset the measurement. Thereafter Zero
adjusts 1 second every minute. D1 flickers orange at the zero point.
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 anticlockwise (minimum voltage)
3. Connect sensor to J2 terminal (W) white (P) pink (Y) yellow
4. Connect 24v + and 0V to J10, short the 4~20mA terminal by inserting test link at J9
5. Set the sensor voltage to 5.0V (4.0 for NH
3
)measured at SV and 0V, adjust by turning RV4
clockwise
DO NOT EXCEED THE REQUIRED VOLTAGE OTHERWISE PERMANENT DAMAGE WILL OCCUR
6. Insert jumper G2 for a nominal gain value (G1 is lowest gain, G5 is highest or a combination G1
to G5)
7. Connect a PC to J3 with and RS232 Combi adaptor (part no. 160510 and lead part no. 160515)
and Hyperterminal 4800/1stop/8bit and initialise the sensor using (C) calibration mode, then shift
+ ($) command from the keyboard. The default gas is Ammonia 1000 ppm
8. The typical Hyperterminal display is (also see appendix 1)
27 Ammonia 1000.0ppm
O H L D F I
^ ^ ^
- - - - - - PPM= 0 A=80 R=80 Adj=497 PInh=52 adj=4 CG=314.0 CGADC=385
PPM
is the gas value
A
is the processor raw measurement (0 to 1000)
R
is the zero point of the sensor (100 +/-2)
Adj
is the adjustment value to autozero 0 to 1000 but 500 is ideal.
Pinh
is the number of seconds left of powerup inhibit (autozero is active during this time)
adj
is the number of seconds until a 1 second autozero will occur.
CG
is the calibration gas value PPM.
CGADC
is the number A must reach to display the value CG as the correct PPM gas reading