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4–20mA to Catalytic Input Converter 04200-A-1201
Operating Instructions
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MAN0488.PM6 Issue 02 4 - 20mA to Catalytic Converter
04200-M-5012
Helping to make a Safer World
Ensure that you read and understand these Operating Instructions BEFORE
operating the equipment.
Please pay particular attention to the Safety Warnings.
WARNINGS
1. Not designed or certified for use in hazardous areas.
2. For indoor use only.
3. Do not expose to rain or moisture.
IMPORTANT
Zellweger Analytics have endevoured to ensure that this 4 - 20mA to
Catalytic Input Converter is compatible with standard bridge input circuits.
Since Zellweger Analytics, however, have no control or full knowledge of
the designe of all bridge input control cards, should difficulties be experienced
using the converter please contact Zellweger Analytics or their agent.
If any further details are required which do not appear in this manual, contact
Zellweger Analytics Limited or their agent.
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CONTENTS
Section Page
1. INTRODUCTION 5
2. INSTALLATION 7
2.1 Connections 7
2.2 Link Settings 7
2.3 Installing 8
2.4 Bridge Supply Adjustments 9
3. ORDERING INFORMATION 11
4. SPECIFICATION 11
FIGURES
Figure Page
1. Signal Converter Module 4 - 20mA 5
2. Interconnecting Diagram 6
3. Link Locations 9
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1. INTRODUCTION
The Signal Converter Module has been designed specifically to interface between
a bridge input circuit, which is typical of several control systems, and a
Searchpoint Optima 4 to 20mA output.
While this manual covers the use of the Signal Converter Module with the
Searchpoint Optima Infrared Detector, the Signal Converter Module can equally
be used to interface between other types of 4 - 20mA output detectors and a
bridge input control system.
The module allows users of an existing installation of catalytic detectors to
retrofit them with Searchpoint Optima Infrared Detectors without the need to
replace field cables or the control system.
Figure 1 Signal Converter Module
62mm
64mm
F
E
G
H
A
B
C
D
MOD
RECORD
1 2 3 4 5 6 7 8 9 10 11
NS D
CONVERTER
4 - 20mA / CATALYTIC
01 B
4 - 20mA A
G
H
0V
E
F
+24V
TYPE 04200-A-1201
Iss Ser No
S C
18mm
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MAN0488.PM6 Issue 02 4 - 20mA to Catalytic Converter
04200-M-5012
The module is designed for use in safe areas only and is contained in a rugged
plastic enclosure which clips onto a standard 35mm DIN rail. It replaces the set
of three 6mm wide DIN rail mounted terminals S, NS and 01 so that it requires
no extra space at the back of the control cabinet or rack.
The module operates at a supply current of 200 to 300mA drawn from the control
card supply which would normally be used to power the catalytic sensor.
The module contains three user configured links which must be set prior to
commissioning. These links set the ground reference for the control current and
the polarity of the mV output signal. The position of these links are shown in
Figure 3.
Figure 2 Interconnecting Diagram
0V
+24V (Red)
0V (Black)
4 - 20mA
(White)
G H
A
B
D
C
+24V
NS
01
S
Most +ve
Centre
Most -ve
Control System
Bridge Input
Circuit
Signal
Converter
Searchpoint
Optima
Note: Terminals E and F provide a convenient straight through wiring
connection for the external transducer and have no connection to the
converter internal circuitry.
F
E
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2. INSTALLATION
2.1 CONNECTIONS
Four pairs of terminals are provided to allow connections to the detector and to
the control system bridge input circuit. These are:
Terminal Signal Description
A 4 - 20mA 4 - 20mA input from the detector.
B 01 Centre output to the control system bridge circuit.
C S Most positive output to the control system bridge circuit.
D NS Most negative output to the control system bridge
circuit.
E +24V Out +24V to the detector.
F +24V In +24V from the control system bridge circuit.
G 0V Out 0V to the detector.
H 0V In 0V from the control system bridge circuit.
Figure 2 shows a block diagram of these connections while the location of these
terminals are shown in Figure 3.
2.2 LINK SETTINGS
CAUTION
Never apply power to the module with BOTH LK1 and LK2 fitted. Only fit
ONE of these two links.
There are three links on the module which need to be configured before
commissioning the system. These are:
LK1 - When fitted, sets the input signal reference to the supply 0V.
LK2 - When fitted, sets the input signal reference to the most negative or
non sensitive (NS) line of the bridge circuit.
LK3 - This is a dual link which determines the polarity of the output
signal voltage. This pair of links is always fitted and are fitted
either in a horizontal or vertical position dependent upon the required
polarity of the output signal.
To access the above links, remove the module front cover using a screwdriver to
prise the cover off the module.
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2.3 INSTALLING
To install the Signal Converter Module, proceed as follows:
(1) Ensure that the Control System channel Control Card to be converted is of
the bridge input type and its sensitivity is compatible with the converted
signal voltage of the Signal Converter Module.
(2) Ensure that the Searchpoint Optima, or 4 to 20mA output device, is of the
current source type.
(3) Inhibit the alarms at the control room.
(4) Withdraw the associated channel Control Card to remove the power to the
circuit to be modified.
(5) Install the Searchpoint Optima, or 4 - 20mA output device, as described in
their associated manual.
(6) Ensure that the 0V line for the Searchpoint Optima, or 4 - 20mA device, is
common with the control system supply or is derived from the control
system control card.
(7) Remove the Signal Converter Module front cover by prising the cover off
with a screwdriver.
(8) Locate the links LK1, LK2 and LK3 and set the links to the required
positions as indicated below:
Control Card Make and Model LK1 LK2 LK3 Supply Adjust
GP Elliot Type GP120 Out In Vertical VR1501
GP Elliot Type SO242 Out In Vertical VR6
ICS Type 200211 In Out Vertical VR4
ICS Type 406675 Out In Horizontal VR4
Sieger 5700 In Out Horizontal RV1
Albion Controls SCE002 In Out Horizontal RV1
IGD 605CC In Out Vertical R54
(9) Replace the module front cover.
(10) Disconnect any redundant sensor wiring to the Control Card input.
(11) Remove the three DIN terminal blocks for the old sensor connections. ie.
Most positive or S, centre or 01 and most negative or NS.
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(12) Fit the Signal Converter Module to the DIN rail in the position vacated by
the three DIN terminal blocks.
(11) Connect the Searchpoint Optima, or 4 - 20mA device, field wiring and
control card input as shown in Figure 2.
2.4 BRIDGE SUPPLY ADJUSTMENT
The following procedure is written for use with the Searchpoint Optima, however
a similar procedure is suitable for other 4 - 20mA sensor devices.
To complete the installation of the Signal Converter Module, continue as follows:
(1) Inhibit the control system alarm/fault relays.
(2) Connect the Control Card to the control system by means of a suitable
extension lead. This will automatically reconnect power to the Searchpoint
Optima and Signal Converter Module.
(3) Using a DVM and with 0mA applied to the converter, measure the dc
voltage between the Signal Converter Module terminals C and D which
should be between 2.9V and 3.0V.
(4) If the DVM readings is outside the 2.9V to 3.0V limits, adjust the
associated Control Card adjustment to bring the reading within limits.
Note: Ensure the 300mA maximum rating for the converter is not exceeded.
(5) Disconnect the Control Card extension lead and re-insert the Control Card
into the System.
(6) Allow at least 20 seconds for initialisation to occur.
Figure 3 Link Locations
LK3 (2 off)
(Links shown in the
vertical position)
LK1
LK2
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(7) Adjust the Control Card ZERO adjustment for zero reading on the Control
Card display.
(8) Leave the Searchpoint Optima to stabilise for one hour and then readjust
the ZERO adjustment again for a zero reading on the Control Card
display.
(9) Following the procedure as detailed in the Searchpoint Optima Manual,
either:
a. Apply a known concentration of gas to the Searchpoint Optima or,
b. Using the Optima Hand-Held Interrogator, inject a signal of between
4 and 20mA (12mA = 50% fsd).
(10) Adjust the Control Card SPAN adjustment to set the Control Card display
to the correct reading.
Notes: 1. If the display shows a negative reading during Steps (8) and (9),
change the position of the LK3 connections.
2. A degree of drift may be experienced while the Control Card
stabilises.
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3. ORDERING DETAILS
04200-A-1201 Signal Converter Module, 4 to 20mA.
4. SPECIFICATION
Input Signal: 0 to 25mA.
Output Signal: 0 to 70mV (for a 4 to 20mA input signal).
Repeatability: ±1% fsd.
Zero Drift: Less than ±1% fsd.
Span Drift: Less than ±1% fsd.
Response time: 200ms.
EMC Protection: Conforms to: BS EN 50082-1:1992.
BS EN 50081-1:1992.
Additional radiated immunity test level of 10V/m.
Complies with: 89/336/EEC.
93/68/EEC(d).
Operating Temperature: -10OC to +40OC.
Storage Temperature: -40OC to +75OC.
Weight: 44 grams
Connections: Screw down terminals for up to 2.5mm2 stranded
conductors.
Power Supply: 2.9V to 3.0V at 200mA to 300mA.
Derived from the original catalytic sensor power
source on the control card.
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Thank you for reading this data sheet.
For pricing or for further information, please contact us at our UK Office, using the details
below.
UK Office
Keison Products,
P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England.
Tel: +44 (0)330 088 0560
Fax: +44 (0)1245 808399
Email: sales@keison.co.uk
Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the
suitability of this product.
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