e2v DX600 User manual

DX600
Circular Display and Calibration Board
for Infrared Gas Sensors
FEATURES
*Compatible with e2v technologies TX600 transmitter board
and IR600 Series Infrared Gas Sensor Heads for Hazardous
areas.
*Direct link to TX600 for display and calibration.
*Menu driven by calibration pushbuttons.
*Small size and low weight.
INTRODUCTION
The DX600 circular display board provides a calibration facility
for the TX600 Circular Transmitter Board and also provides a
loop monitor display. The DX600 is mounted directly above the
TX600 and is connected to it by a vertical 8-way double inter-
PCB connector. The whole assembly may be installed in an
explosion-proof enclosure. Refer also to the TX600 data sheet.
Following these specifications, the full calibration procedure is
explained.
GENERAL DATA
Dimensions:
length ............... 70mm
width ............... 70mm
height ............... 22mm
location slots ........... 11.5 x 6 mm
Weight .................27g
Power input ...... 5.0+0.25 V at 1 mA nominal
Power consumption ........ 5mWnominal
Signal input (link selectable) . . . 0.4 to 2.0 V loop monitor
0.4 to 2.0 V system monitor
Display type ............3.5digit LCD
Display ranges (link selectable) ........0to100
0 to 200
0 to 500
Decimal point ......... link selectable DP2
Resolution ......... least significant digit
Indicators:
green flashing ............. OK
yellow ................ zero
yellow ................span
red .................fault
Switches .............. 4xSPNO
for calibrate, up, down and system reset
Minimum underrange level . . 2.5 mA (79.375% full scale)
Maximum overrange level . . 21.31 mA (108% full scale)
Fault indication ...........redfault LED
display reads 712.5% full scale
Adjustment ...... 4mAback-off to zero display
span fine adjust on display
Temperature drift ...... +0.2 counts/8C nominal
Temperature range:
operating ........... 710 to +50 8C
storage ............ 720 to +60 8C
Humidity .......15to95%RH,non-condensing
Connection ......... 8x2-way DIL socket
#e2v technologies (uk) limited 2007 A1A-DX600 Issue 3, May 2007
101159
e2v technologies (uk) limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU, UK Telephone: [phone] Facsimile: [phone]
e-mail: [e-mail] Internet: www.e2v.com Holding Company: e2v technologies plc
e2v technologies inc. 4 Westchester Plaza, PO Box 1482, Elmsford, NY10523-1482 USA Telephone: [phone] Facsimile: [phone]
e-mail: [email protected]

LD4 LD3 LD2 LD1
SW3SW2 SW1
DIS1
SW4
LK1 VR1
R8
R7
IC1
LK3
LK4
R6
R4
R5
R3
LK2
R2R1
RESET
CAL UP DOWN
8195
70.01
1.6 THICK
70.01
6.0
3.0 RAD.
158.1
175.0
DISPLAY BOARD LAYOUT (Dimensions in millimetres)
DX600 OVERVIEW
Calibration is performed using the DX600 and is menu driven
and performed by the 3 calibration switches:
CAL steps through the calibration menu in the order zero,
span and sensitivity (SW2).
UP allows positive adjustment of the displayed value
(SW3).
DOWN allows negative adjustment of the displayed value
(SW1).
The menu is entered by pressing the CAL button, the value
adjusted by pressing the UP and DOWN buttons and the
resulting calibration constants are stored when the CAL button
is pressed again to step through the menu. Temperature
compensation is automatic and the temperature is measured
inside the associated IR600 series head. The sensitivity adjust is
used to provide a variable full-scale range, if the default range is
not appropriate.
The display/calibration board also contains the following:
*An LCD display to show the output (DIS1).
*A RESET pushbutton, used to clear any fault indications
and reset the CPU for a full restart (SW4).
*A decimal point link to show or remove the decimal on the
displayed output (LK1).
*A series of 3 links (of which only one is selected), to set the
full-scale output value to either 100, 2000 or 500 (LK2, LK3
and LK4).
*Four status LEDs (LD1, LD2, LD3 and LD4)
*A potentiometer for zeroing the display board (VR1).
*An 8 x 2-way connector for attachment to the transmitter
board (PL1).
Changing the settings on the sensor select switches forces a
reset and erases any existing calibration data. If the RESET
button is pressed during the set span or set sensitivity
sequence, then the calibration data is erased. Whenever the
calibration data is invalid or erased, the transmitter forces a
calibration sequence by automatically entering the set zero
sequence after a reset or power up.
LED INDICATOR DESCRIPTION
The green LED indicator, labelled OK, indicates the system
condition as follows:
Green LED Cause
OFF Non-recoverable fault, system not
functioning.
FLASHING @ 2 Hz Initial startup and self-checking in
progress.
FLASHING @ 4 Hz Normal functioning.
ON Fault designator when illuminated
along with the red F LED (see below).
The yellow Z LED indicator illuminates when in the set zero
mode. It is also used as a fault designator if the red F indicator
is also illuminated (see below).
The yellow S LED indicator illuminates when in the set span
mode. It is also used as a fault designator if the red F indicator
is also illuminated (see below).
The Red F indicator is used as the fault indicator with guidance
as to the source of the fault being indicated by the other LEDs
as follows:
DX600, page 2 #e2v technologies

Green
OK LED
Yellow
Z LED
Yellow
S LED
Red
F LED
Fault diagnostic
OFF OFF OFF ON Input power
voltage fault.
ON OFF OFF ON System 4 – 20 mA
monitor fault.
OFF ON OFF ON Source current
fault.
ON ON OFF ON Maths fault (or un-
derrange fault).
OFF OFF ON ON Spare fault
designator.
ON OFF ON ON Spare fault
designator.
OFF ON ON ON A/D, RAM, ROM
fault.
ON ON ON ON EEPROM fault.
CALIBRATION
The TX600 transmitter board is calibrated to provide a linear 4 –
20 mA output for an IR600 Series sensor seeing gas
concentrations from zero to full span. A TX600 transmitter
board and IR600 Series sensor are normally supplied as a
pair and are calibrated for the default full span gas
concentration of the sensor. Should a different calibration
be required, then re-calibration may be performed using a
DX600 display board and a supply of calibration gas.
To re-calibrate, perform the following operations:
i) Set up the TX600 transmitter board and sensor:
a) Connect a 100 W load resistor across the current output
(I+) and 0 V terminals of connector PL1.
b) Connect the power supply leads to the power input
(V+) and 0 V terminals of PL1.
c) Plug the IR600 connector into header PL3.
d) Plug the DX600 display board into socket PL2.
e) Apply nitrogen to the sensor at 1 litre per minute (e.g.
using a Quick Calibration Hood, e2v product number
DPP546618DA).
f) Preset the power input to 24 V (with a current limit of
250 mA) then switch the power on.
ii) Perform the Zero Calibration Test:
a) Ensure the green OK LED is flashing, then press the CAL
button. The yellow Z LED will illuminate; this indicates
that the sensor is in set zero mode. Press the UP and
DOWN buttons on the DX600 Display board as required
to make the reading show "000". When this reading is
stable, press the CAL button on the DX600 board. This
stores the sensor zero in the TX600 memory. Check that
the yellow Z LED is extinguished, the yellow S LED
illuminates and the green OK LED remains flashing.
iii) Perform the Span Calibration Test:
a) Apply the calibration gas to the IR600 sensor head at a
flow rate of 1 litre per minute.
b) Press the UP and DOWN buttons on the DX600 board as
required to make the display show the percentage of the
appropriate full scale value, dependent upon the IR600
sensor type, set by the sensor select switches SW1 on
the TX600 Transmitter Board (see A1A-TX600 data
sheet). Once the reading is stable, press the CAL button
on the DX600 board. This stores the span value in the
TX600 memory. Check that both the yellow Z LED and
the yellow S LED illuminate and that the green OK LED
remains flashing.
iv) Set the sensitivity of the sensor:
As a default, the TX600 is calibrated to read full scale on
the DX600 display when the sensor sees full concentra-
tion span gas. However, the TX600 may be set up to
read full scale for a lesser concentration:
a) Perform calibration for zero to full span gas concentra-
tion (as per ii and iii above). Both yellow LEDs should be
lit and the green OK LED should be flashing at the end of
this procedure.
b) Apply the required full scale gas concentration to the
sensor at a flow rate of 1 litre per minute and wait for the
reading to become stable.
c) Press the UP and DOWN buttons on the DX600 board as
required to make the display show full scale. When the
reading is stable, press the CAL button on the DX600
display board to store the sensitivity value in memory
and exit the calibration cycle. Check that both the yellow
LEDs extinguish and that only the green OK LED remains
flashing.
Example: IR601 Series sensor with default calibration 0 – 2%
vol. CO
2
. To set up for 0 – 1% vol. CO
2
:
a) Perform calibration for 0 – 2% vol CO
2
(as per ii and iii
above).
b) Apply 1% vol. CO
2
and wait for the reading to remain
constant at 50% full scale.
c) Adjust sensitivity to 100% full scale then press the CAL
button to store the sensitivity value in memory and exit the
calibration cycle.
Note that for the default calibration, the sensitivity value is the
same as the full scale span value.
Note: The DX600 displays the output from the TX600 and is
normally calibrated to display zero to full scale readings of 1.00,
2.00, 5.00, 100, 200 or 500 (see below) for TX600 outputs of 4 –
20 mA at terminal (I+) or 0.4 – 2.0 V at terminal (V+) when a
100 Oresistor is placed across the (I+) and 0 V terminals. The
full scale reading is set by the configuration of DX600 links LK1,
LK2,LK3 and LK4 as follows:
Full Scale
Reading LK1 LK2 LK3 LK4
1.00 Made Made Unmade Unmade
2.00 Made Unmade Made Unmade
5.00 Made Unmade Unmade Made
100 Unmade Made Unmade Unmade
200 Unmade Unmade Made Unmade
500 Unmade Unmade Unmade Made
#e2v technologies DX600, page 3

HANDLING PRECAUTIONS
Electrostatic Sensitive Devices
e2v technologies’ infrared gas mini sensors and associated
electronics contain electrostatic sensitive components. Anti-
static handling precautions should be employed when handling
these devices.
ORDERING INFORMATION
IR600 Series Sensors, TX600 Transmitter Boards and DX600
Display Boards may be ordered as individual items or as
combinations.
The thread code must be included with a sensor order, e.g.
IR601/1 for a carbon dioxide sensor with metric 20 x 1.5 mm
mounting thread.
TX600 Transmitter Boards should be calibrated to specific
IR600 Series Sensors.
When an IR600 Series Sensor is ordered with a factory
calibrated TX600 Transmitter Board, the combination is
referred to as a TX600 Series assembly.
For example, a customer requiring a TX600 Transmitter Board
calibrated with an IR601/1 sensor should order:
TX601/1 (i.e. IR601/1 + TX600 = TX601/1).
Printed in EnglandDX600, page 4 #e2v technologies
Whilst e2v technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use
thereof and also reserves the right to change the specification of goods without notice. e2v technologies accepts no liability beyond that set out in its standard
conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein.