T E C H N O L O G I E S
Technical Sheet ref C1518C v.2
292 D6C
XDI-XDIwin / 30J
PID SENSOR
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, 20.
Note:
If a new cell is fitted then full calibration is required. PID lamp has an approximate lifetime of 12 months.
Replacement bulb and extractor tool can be purchased using part numbers 010-644 and 010-647 respectively.
PC setup
The auto zero adjust is continuous during power up inhibit period 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 is
adjusted every 60 seconds. D1 flickers orange at the zero point. This function can be toggled on/off by using
command ‘Y’ in hyperterminal. ‘Auto zero’ is only active if gas reading is below 5% of full scale.
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, insert test link at J9 to bypass 4-20mA terminal
5. Set the sensor voltage to 5.0V measured across SV and 0V, adjust by slowly 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 RS232 port using a micro USB lead or for earlier models a sensor programming module
and a USB to RS232 converter (part no. 160510 and (part no. 160520) use hyperterminal set to
4800/1stop/8bit and initialise the sensor using (C) calibration mode, then shift + ($) command from the
keyboard. The default gas is Isobutylene 200ppm.
8. The typical hyperterminal display is (also see appendix 1)
60 C4H8 200ppm
O H L D F I
^ ^ ^
- - - - - - PPM=0 A=010 R=010 Adj=500 Pinh=0 adj=4 CG=100 CGADC = 222
PPM
is the gas value
A
is the processor raw measurement
R
is the zero point of the sensor (10 ± 2)
Adj
is the adjustment value of autozero circuit, it can be between 0 and 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
9. Sensor Zero is true when D1 flashes orange and potentiometer VR2 is adjusted to ensure Adj (screen text)
is between 400 and 600. Turning VR2 clockwise will increase Adj. Note: pressing (R) or J28 short will reset
sensor and give 1 min adj time (when in clean air).
10. Press F to adjust the 4mA output by measuring the mV across TP8 and TP9. Press H or L to adjust then press
SPACE to set and exit.
