Bacharach 2772-0803 User Manual
INSTRUCTION 2772-0803
REMOTE INTELLIGENT SENSOR
AREA MONITOR
Installation/Operation/Maintenance
Rev. 14 – February 2004 (CN #3252)
®
251 Welsh Pool Road
Website: www.scottinstruments.com • www.bacharach-inc.com
Ph: 610-363-5450 • Fax: 610-363-0167
Printed in U.S.A. ®Registered Trademark
Exton, PA 19341
Declaration of Conformity
Manufacturer's Name: SCOTT INSTRUMENTS
Manufacturer's Address: 251 Welsh Pool Road
Exton, PA 19341 USA
Product Name: Remote Intelligent Sensor
Conforms to the following product specifications
EMC: European Directive 89/336/EEC
EN 500081-1 (Emissions)
EN 500082-1 (Immunity)
A
REMOTE INTELLIGENT SENSOR - AREA MONITOR
CONTENTS
Page #
FEATURES .................................................................................................................................... v
PRODUCT SPECIFICATION ...........................................................................................................vi
RIS CATALOG NUMBERS & DATA ............................................................................................. viii
1 INTRODUCTION ........................................................................................................................... 1-1
1.1 SYSTEM DESCRIPTION .......................................................................................................... 1-1
1.2 BASIC PRINCIPLES ................................................................................................................. 1-1
1.3 GENERAL DESCRIPTION ....................................................................................................... 1-1
1.3.1 ENCLOSURE................................................................................................................ 1-1
1.3.2 CABLE GLANDS .......................................................................................................... 1-1
1.3.3 MAIN SYSTEM BOARD .............................................................................................. 1-1
1.3.4 SYSTEM POWER SWITCH SW1 ............................................................................... 1-2
1.3.5 MECHANICAL CHASSIS ............................................................................................ 1-2
1.3.6 BACK-UP BATTERY ................................................................................................... 1-2
1.3.7 BASE BOARD ............................................................................................................... 1-2
1.3.8 SAMPLE INLET........................................................................................................... 1-3
2 INSTALLATION AND SYSTEM CHECK .................................................................................. 2-1
2.1 UNPACKING ............................................................................................................................. 2-1
2.2 BATTERY CONNECTION........................................................................................................ 2-1
2.3 MECHANICAL INSTALLATION ............................................................................................ 2-1
2.4 ELECTRICAL INSTALLATION .............................................................................................. 2-1
2.4.1 CABLE RECOMMENDATION .................................................................................... 2-1
2.4.1.1 PSU to RIS Input ................................................................................................... 2-1
2.4.1.2 PSU to Alarm Module ........................................................................................... 2-1
2.4.1.3 RIS Relay Output to Alarm Module ..................................................................... 2-1
2.4.1.4 0 – 1V Analog Output ............................................................................................ 2-1
2.4.1.5 4 – 20 mA Analog Output ..................................................................................... 2-1
2.4.2 POWER SUPPLY AND INPUT CONNECTIONS ................................................... 2-1
2.4.3 OUTPUT CONNECTIONS ......................................................................................... 2-2
2.4.4 RELAY OUTPUTS ....................................................................................................... 2-2
2.4.5 ANALOG OUTPUTS ................................................................................................... 2-2
2.5 SYSTEM POWER SUPPLY CONSIDERATION & SELECTION ........................................ 2-2
2.5.1 RIS POWER SUPPLIES .............................................................................................. 2-2
2.5.1.1 ‘Single Point’ .......................................................................................................... 2-2
2.5.1.2 ‘Multi Point’ ........................................................................................................... 2-2
2.5.2 POWER REQUIREMENTS, RIS & ALARM MODULE ........................................... 2-3
2.5.2.1 Low Flow RIS Models ............................................................................................ 2-3
2.5.2.2 High Flow RIS Models ........................................................................................... 2-3
2.5.2.3 ‘Worst Case’ Currents ........................................................................................... 2-3
2.5.2.4 Alarm Module......................................................................................................... 2-3
2.5.2.5 Summary ‘Worst Case’ Input Currents .............................................................. 2-3
2.6 SAMPLE LINES ........................................................................................................................ 2-3
2.6.1 GENERAL ..................................................................................................................... 2-3
2.6.2 LESS REACTIVE GASES ............................................................................................ 2-3
2.6.3 REACTIVE GASES ....................................................................................................... 2-4
2.6.4 SYSTEM PERFORMANCE WITH EXTENDED SAMPLE LINES ........................ 2-4
2.7 0 – 1 VOLT CONVERSION ...................................................................................................... 2-4
2.7.1 TOOLS & MATERIALS REQUIRED ......................................................................... 2-4
2.7.2 PROCEDURE................................................................................................................ 2-4
Instruction 2772-0803 Page i
REMOTE INTELLIGENT SENSOR - AREA MONITOR
CONTENTS (continued)
2.8 SYSTEM CHECK ....................................................................................................................... 2-4
2.8.1 TAPE CASSETTE LOADING ..................................................................................... 2-4
2.8.2 CHECK AND ADJUST SYSTEM PARAMETERS .................................................... 2-5
2.8.2.1 V, System Voltage ................................................................................................. 2-5
2.8.2.2 mA, ‘Charger Current’ ......................................................................................... 2-5
2.8.2.3 Alarm Set Points .................................................................................................. 2-5
2.8.2.4 Alarm Level 1 and 2 ............................................................................................. 2-5
2.8.2.5 Gas Curve .............................................................................................................. 2-6
2.8.2.6 Multi Gas Curve Systems .................................................................................... 2-6
2.8.2.7 Light Levels Track 1 & 2 .................................................................................... 2-6
2.8.2.8 Flow Rate ............................................................................................................... 2-6
2.8.2.9 Date & Time ......................................................................................................... 2-6
2.8.2.10 Interruption of TEST Mode Cycle ...................................................................... 2-7
2.8.2.11 Completion of Checks .......................................................................................... 2-7
2.9 OPTION PCB INSTALLATION .............................................................................................. 2-7
2.9.1 PRINTER (OPTION) INTERFACE INSTALLATION ............................................. 2-7
2.9.2 PORTABLE PRINTER ................................................................................................. 2-7
2.9.3 ALARM MODULE CONNECTION ............................................................................ 2-7
2.9.4 RELAY ALARM INSTALLATION ............................................................................. 2-7
3 SYSTEM OPERATION AND FEATURES ................................................................................ 3-1
3.1 COMPLETE SAMPLING SEQUENCE ................................................................................... 3-1
3.1.1 AUTOMATIC PURGE CYCLE ................................................................................... 3-1
3.1.2 TWIN TRACK TAPE SAMPLING ............................................................................. 3-1
3.1.3 TAPE REFERENCE MEASUREMENT ..................................................................... 3-1
3.2 DENSITY AND TIME OPERATING MODES ........................................................................ 3-2
3.2.1 DENSITY MODE .......................................................................................................... 3-2
3.2.2 TIME MODE ................................................................................................................. 3-2
3.3 CHANGE-OVER FROM DENSITY TO TIME MODE ........................................................... 3-2
3.4 MIMINUM SAMPLE TIME ..................................................................................................... 3-2
3.5 TAPE CASSETTE LIFE ............................................................................................................ 3-2
3.6 DATA POINT STORAGE .......................................................................................................... 3-2
3.7 SYSTEM DISPLAY .................................................................................................................... 3-2
3.7.1 SYSTEM NORMAL, GAS CONCENTRATION ZERO OR LOW. ........................... 3-2
3.7.2 SYSTEM NORMAL, GAS CONCENTRATION ABOVE THE
ALARM THRESHOLD ................................................................................................. 3-3
3.7.3 OVERRANGE ALARM ................................................................................................. 3-3
3.7.4 SYSTEM FAULT .......................................................................................................... 3-3
3.8 SYSTEM ALARMS ..................................................................................................................... 3-3
3.8.1 GAS ALARM ................................................................................................................. 3-3
3.8.2 ADDITIONAL GAS ALARM SET POINT ................................................................. 3-3
3.8.3 FAULT RELAY ............................................................................................................ 3-4
3.9 DIAGNOSTICS .......................................................................................................................... 3-4
3.10 TEST MODE ............................................................................................................................ 3-4
3.11 KEYPAD FUNCTION ............................................................................................................ 3-4
3.11.1 ‘HOLD/RELEASE’ KEY ............................................................................................... 3-4
3.11.2 ‘PRINT’ KEY ................................................................................................................. 3-4
3.11.3 ‘15 MIN TWA (DECADE)’ KEY .................................................................................. 3-4
3.11.4 ‘8 HR TWA (DIGIT SET)’ KEY .................................................................................... 3-4
3.12 USING THE KEYBOARD ....................................................................................................... 3-4
Page ii Instruction 2772-0803
REMOTE INTELLIGENT SENSOR - AREA MONITOR
CONTENTS (continued)
3.13 OPTIONAL FEATURES ......................................................................................................... 3-4
3.13.1 RELAY ALARM OPTION............................................................................................ 3-4
3.13.2 PRINTER INTERFACE OPTION ..............................................................................3-4
3.13.3 TEST CARD ..................................................................................................................3-4
3.14 PRINTER OPERATION & USE (OPTIONAL FEATURE) ................................................. 3-5
3.14.1 GENERAL ..................................................................................................................... 3-5
3.14.2 PRINTER SPECIFICATION ...................................................................................... 3-5
3.14.3 PRINTOUT MODES ..................................................................................................... 3-6
3.14.3.1 Printing 'On Line' ................................................................................................. 3-6
3.14.3.2 Print at Intervals ..................................................................................................3-6
3.14.3.3 Print on Command ................................................................................................ 3-6
3.14.3.4 Printed Date Format ............................................................................................ 3-7
3.14.3.5 Data Storage up to 7 Days ....................................................................................3-7
3.14.3.6 Preventing Data Loss ........................................................................................... 3-7
3.14.4 PRINTER CARD DESCRIPTION .............................................................................. 3-7
3.14.4.1 Real Time Clock .................................................................................................... 3-7
3.14.4.2 Data Storage .......................................................................................................... 3-7
3.14.4.3 Data Communication ............................................................................................ 3-7
3.14.4.4 Selection of Printer Baud Rate ............................................................................ 3-7
3.14.5 CONNECTING A PRINTER ....................................................................................... 3-7
3.14.5.1 GMD Printer Connection ..................................................................................... 3-7
3.14.5.2 Connecting a Non-GMD Printer .......................................................................... 3-8
3.14.5.3 Portable Use of a Non-GMD Printer ....................................................................3-8
4 MAINTENANCE AND TROUBLESHOOTING ................................................................... 4-1
4.1 MAINTENANCE GENERAL.......................................................................................... 4-1
4.2 VERIFYING THAT A GAS ALARM WAS CAUSED BY GAS .................................... 4-1
4.3 CLEARING A SPURIOUS ALARM ............................................................................... 4-1
4.4 ADJUST LIGHT LEVELS .............................................................................................. 4-1
4.5 CHECKING AND ADJUST SYSTEM FLOW RATE .................................................. 4-2
4.6 DISABLING THE ‘DOOR OPEN’ ALARM ................................................................... 4-2
4.7 ADJUST THE DOOR SWITCH ..................................................................................... 4-2
4.8 MEASURING PUMP CURRENT .................................................................................. 4-3
4.9 RESETTING THE PRINTER OPTION STORAGE .................................................... 4-3
4.10 CLEANING THE SAMPLING INPUT AND OPTICS BLOCK ................................. 4-3
4.10.1 INTRODUCTION............................................................................................. 4-3
4.10.2 LIGHT LEVEL ADJUSTMENT ..................................................................... 4-3
4.10.3 WHEN TO CLEAN .......................................................................................... 4-3
4.10.4 HOW TO CLEAN ............................................................................................. 4-4
4.10.5 DIRECT CLEANING OF THE LED’S AND PHOTO DIODES .................. 4-4
4.10.6 REPLACING THE OPTICS BLOCK ............................................................. 4-4
4.10.7 WHAT TO DO IF CLEANING DOES NOT RECTIFY THE PROBLEM .. 4-5
4.11 CHANGING A PUMP. .................................................................................................... 4-5
4.11.1 PREPARATION ................................................................................................ 4-6
4.11.2 REMOVAL OF THE MECHANICAL CHASSIS ........................................... 4-6
4.11.3 PUMP REMOVAL ............................................................................................ 4-6
4.14.4 FITTING THE NEW PUMP........................................................................... 4-6
4.14.5 REPLACING THE MECHANICAL CHASSIS AND
SETTING PUMP FLOW ................................................................................ 4-6
Instruction 2772-0803 Page iii
REMOTE INTELLIGENT SENSOR - AREA MONITOR
CONTENTS (continued)
4.12 EXTERIOR CLEANING ................................................................................................. 4-6
4.13 KEY PARAMETER CHECKS ......................................................................................... 4-6
4.14 MECHANICAL TIGHTNESS ......................................................................................... 4-7
4.14.1 CABLE GLANDS ............................................................................................. 4-7
4.14.2 DOOR SWITCH ................................................................................................ 4-7
4.14.3 DOOR SEALS ................................................................................................... 4-7
4.14.4 SAMPLE INLET .............................................................................................. 4-7
4.14.5 INTERFACE TERMINAL SCREWS .............................................................. 4-7
4.15 INPUT PATH CLEANING ............................................................................................ 4-7
4.16 PUMP CHECK ................................................................................................................ 4-7
4.17 CHARCOAL FILTER & TUBING CHECK .................................................................. 4-7
4.18 TROUBLESHOOTING GENERAL ............................................................................... 4-7
4.19 EXCESSIVE INPUT CURRENT ................................................................................... 4-7
4.19.1 HIGH CHARGING CURRENT....................................................................... 4-7
4.19.2 HIGH PUMP CURRENT ................................................................................ 4-7
4.20 LOW PUMP FLOW ........................................................................................................ 4-7
4.20.1 A FAULTY PUMP ........................................................................................... 4-8
4.20.2 A BADLY FITTED INPUT TUBE ................................................................. 4-8
4.20.3 A FAULTY TAPE GATE SEAL...................................................................... 4-8
4.20.4 LEAKING OR LOOSE TUBING .................................................................... 4-8
4.21 EXCESSIVE TAPE USE ................................................................................................. 4-8
4.21.1 MONITORED CONCENTRATION LEVELS HIGH .................................... 4-8
4.21.2 EXCESSIVE STEP LENGTH ......................................................................... 4-8
4.22 TAPE BREAKAGE .......................................................................................................... 4-8
4.23 LIGHT FAULTS .............................................................................................................. 4-8
4.24 DOOR FAULT ................................................................................................................. 4-8
5 SYSTEM SPARE PARTS ........................................................................................................ 5-1
5.1 MODEL DEPENDENT PARTS ..................................................................................... 5-1
5.1.1 CASSETTE ........................................................................................................ 5-1
5.1.2 OPTICS BLOCK ............................................................................................... 5-1
5.1.3 BACK-UP BATTERY ....................................................................................... 5-1
5.1.4 PUMP ASSEMBLY .......................................................................................... 5-1
5.2 SYSTEM POWER SUPPLIES ....................................................................................... 5-1
5.2.1 ‘SINGLE POINT’ ............................................................................................. 5-1
5.2.2 ‘MULTIPOINT’ ................................................................................................ 5-1
5.3 RECOMMENDED SPARES ............................................................................................ 5-1
5.4 COMMON PARTS ........................................................................................................... 5-2
5.5 OPTIONS AND SUPPLIES ........................................................................................... 5-2
5.6 SERVICE CENTERS ....................................................................................................... 5-2
SUPPLEMENT A ............................................................................................................................ S-A1
A1 EARLIER IRS BASE BOARDS ....................................................................................... S-A1
A1.1 ADJUSTING LIGHT LEVELS ON PHASE 1 RIS UNITS ......................... S-A1
RIS TEST/FAULT PARAMETER LOG SHEET
Page iv Instruction 2772-0803
REMOTE INTELLIGENT SENSOR - AREA MONITOR
FEATURES
• TRUE CONTINUOUS MONITORING WITH RELIABLE PAPER TAPE DETECTION
Using GMD developed, optimized and proven tape technology.
• MICROPROCESSOR CONTROLLED AND SOLID STATE LOGIC
For reliability, flexibility and calibration stability.
• QUICK RESPONSE & AUTORANGING
Sophisticated, dynamic control of the sampling sequence provides a response time as low as 15
seconds, excellent resolution of short term peaks and economic use of tape.
• LOCAL OR REMOTE WARNING
Highly visible display of measured concentration, system status, gas and system fault alarms.
Remote warnings of gas and fault alarms via solid state relay interface. Optional audible and visual
alarm module provides high impact additional warning.
• CONTINUOUS DIAGNOSTICS & SYSTEM TEST MODE
Monitors the status of key parameters and enables the system to be kept in optimum condition.
• BATTERY BACKUP
Integral backup battery automatically provides supply failure protection.
• USER SELECTABLE ALARM SET POINTS
The default values assigned may be set at any value in the detection range through the system
keyboard.
• UP TO FOUR WEEK CASSETTE WITH INTEGRAL PURGE FILTER
One piece design eliminates tape handling and provides economy of use.
• SYSTEM EXPANSION
Comprehensive area monitor schemes can be built one point at a time, each selected to measure
the gas required.
• OPTIONAL FEATURES
Printer option with storage of up to 7 days worth of data points.
Instruction 2772-0803 Page v
REMOTE INTELLIGENT SENSOR - AREA MONITOR
PRODUCT SPECIFICATION
ACCURACY
PHYSICAL
Dimensions: 7" Depth x 11.75" Width x 7.875" Height
Weight: 11.5 lbs. (5.2 Kg.).
Enclosure: IP-55 with sealed glands (NEMA 4).
Cable Glands: 3 x for input/output cables. Pre-wired connector for Optional Printer.
POWER INPUT REQUIREMENTS
External Power Supply: 12VDC
Input Current: Depends upon model and conditions.
Low Flow models: (200cc/min or less) Cat.# 2772-0010/015/020/030/035/040/060/
High Flow models: (700cc/min or less) Cat.#272-0120/160/175 etc.
ppb Ranges: ± 15 % of reading ± 1 ppb.
ppm Ranges: ± 15 % of reading ± 0.01 ppm.
2772-0020: ± 20 % of reading ± 0.01 ppm.
2772-0035: ± 20 % of reading ± 0.02 ppm.
(178mm D x 298mm W x 200mm H)
090/095/100/110/150 etc.
Normal run current (charged battery) =150–200mA
Run current (discharged battery) =500–700mA
Normal run current, (charged battery) =250–300mA
Run current (discharged battery) =600–800mA
OUTPUTS
Solid State ‘Relay’ Output:
Standard System: 1 Combined Gas/ Fault Alarm.
Optionally: 2 Gas Alarms plus 1 Fault Alarm, or
Devices rated @ 1A./60 V DC max.
Surge current (1 second) = 5A peak.
Turn on/off time = 50, ms.
On state voltage = 1.5V DC
Off state leakage at 60 V DC across the load = 200, µA
Logic: Device normally ‘closed’, opens on alarm
(with standard system software).
Analog Output:
Standard: 4–20 mA is default on the instrument.
0–1 V DC can be hardware selected.
In both cases the minimum = zero concentration,
and the maximum value = system range maximum.
(Other configurations available. Contact Customer Service)
Page vi Instruction 2772-0803
DISPLAY
Custom LCD Display: Area measures 5.7" (145mm) x 3.2" (81 mm).
Displayed parameters
include:
In the TEST Mode, display
includes:
Alpha/Numeric characters: 0.92" (23.4mm) high.
KEYBOARD
Membrane Switch Panel: Four switches for the following functions:
REMOTE INTELLIGENT SENSOR - AREA MONITOR
PRODUCT SPECIFICATION (continued)
System Readiness status,
Measured Concentration (3 decades of ppb or ppm),
Tape Remaining, and Icons for Gas & Fault alarms.
Alarm Set Point(s), System Current (mA),
Alarm Type, Regulated Voltage (V), Active Gas Type,
Track 1 & 2 Light Levels, and, Date & Time (with optional
Serial Printer Interface PCB, Section 5).
PRINT, 8 HR. TWA /DIGIT SET, 15 MIN TWA/DECADE,
& HOLD/RELEASE.
INTERNAL BACK-UP BATTERY
Sealed Lead Acid Battery: 6 v / 1.1 Ah Charge maintained with external power connected.
(the internal power switch SW1 can be on or off).
ENVIRONMENTAL
Temperature Range: –10 °C to +40 °C ( operating)
(Instrument Only) Relative Humidity (System Hardware): 5–95% (non-condensing).
SAMPLING INPUT
FEP: Teflon input tubes
OPTIONS
Printer option: TTL serial interface and 7-Day memory.
Three (3) Relay option: 2 x gas alarm outputs with adjustable set point and 1 x fault
alarm output.
CATALOG #, CASSETTE #,
RANGES and MODEL
DEPENDENT PARAMETERS: See RIS Catalog Numbers and Data (Table #1).
Instruction 2772-0803 Page vii
REMOTE INTELLIGENT SENSOR - AREA MONITOR
TABLE #1
RIS CATALOG NUMBERS & DATA
CATALOG
NUMBER
2772-0010 TDI 0 1000 ppb 200 5 10 100
2772-0015 TDI HIGH RANGE 5 2000 ppb 200 5 10 2000
2772-0020 HYDRAZINES 1 2.00 ppm 200 0.05 0.10 2.00
2772-0030 PHOSGENE (A) 3 5.00 ppm 100 0.05 0.10 0.30
2772-0035 VELCORIN® 35 2.00 ppm 200 0.05 0.10 2.00
2772-0040 CHLORINE 7 2.00 ppm 170 0.05 0.10 2.00
2772-0060 ARS INE 8 1000 ppb 200 25 50 100
2772-0090 ACID GASES 9 2.00 ppm 150 0.05 0.10 2.00
2772-0095 HCl HIGH RESOLUTION 10 100 ppb 250 5 10 100
2772-0100 HDI 2 500 ppb 200 5 10 500
2772-0110 PHOSGENE (B) 4 5.00 ppm 100 0.05 0.10 5.00
2772-0120* MDI 6 200 ppb 700 5 10 200
2772-0150 IPDI 12 1000 ppb 200 5 10 100
2772-0160* MDI, TDI, IPDI 97
2772-0175* TDI HIGH FLOW* 14 100 ppb 700 5 10 100
GAS TYPE
GAS
CODE
RANGE UNITS
200 MDI
100 TDI
200 IPDI
ppb 700 5 10 200
FLOW
RATE
ALARM
LEV EL 1
ALARM
LEVEL 2
ANALOG
OUTPUT
* High Flow, all others are Low Flow
Page viii Instruction 2772-0803
REMOTE INTELLIGENT SENSOR - AREA MONITOR
1 INTRODUCTION
1.1 SYSTEM DESCRIPTION
A range of Remote Intelligent Sensors (RIS) are
available. Each is designed to measure low concentrations of a specific gas. Multiple RIS systems can
be connected into a control network to provide an
area monitoring capability with central supervision.
The RIS is a single point, microprocessor
controlled, instrument for use in a fixed location.
Two RIS versions were produced (see Supplement A
for units built before April '92).
The RIS is housed in an environmentally sealed
enclosure and is line-powered, via a DC power
supply, for continuous monitoring. An internal
backup battery is provided as protection against
power interruptions.
The standard system provides clear visual
indication of status, concentration level, 4-20 ma
analog output, gas, and fault alarm conditions.
TWA’s, 15 minute and 8 hour, are displayed at the
touch of a keyboard button.
Reliable and effective operation is assured by
on-line self-diagnostic routines. An easy-to-use
TEST Mode allows key parameters to be checked
and adjusted.
Optional features provide storage, and printout,
of up to one week’s data points, two independently
selectable (via keypad) alarm relays with a separate
fault indication relay and a hardware selectable 0-1
VDC analog output (Sections 2.4.5 & 2.7).
This combination of operating features gives long
tape cassette life at low sampling levels, and a rapid
response with excellent tracking of short term peaks
as levels rise.
The detection of a gas concentration that is higher
than the user-adjustable alarm set point, results in a
highly visible warning on the RIS's large custom
display. In addition, local and remote external warning
devices or systems can be activated via interface
signals.
1.3 GENERAL DESCRIPTION
1.3.1 ENCLOSURE. The instrument is contained
within a tough, IP-55 rated, enclosure that is
suitable for installation inside and out. A large
liquid crystal display (LCD) is mounted in the front
face of the door next to a membrane keyboard that is
used for programming certain functions.
1.2 BASIC PRINCIPLES
A measured sample volume is drawn into the
RIS and passed through a chemically impregnated
paper tape. The tape reacts to the presence of a
specific gas by developing a stain whose intensity is
proportional to the sample concentration.
A beam of light is bounced off the tape and the
reflected light is measured. The difference in
reflected light values, developed before and after
the stain, is used to calculate stain intensity,
enabling the sampled gas concentration to be
determined.
The measurement of low gas concentration
levels takes place during a fixed four minute sample
period. If the sample concentration rises above a
predetermined value, the operating mode changes
and the system measures the time taken for a given
stain value to develope.
This technique provides a wide dynamic range,
good resolution and a rapid response to rising gas
levels. In addition, the tape never becomes saturated
which ensures accurate measurement, and toxic gases
are prevented from breaking through the tape into the
system. A double track, tape management system
gives maximum tape economy.
Figure 1-1. Enclosure
The door is hinged on one side and secured shut
by two screw fasteners, which are opened with a
special key to discourage unauthorized tampering.
The door hinges are easily disengaged and removal of
the door from the base is quick and simple, should
this ever be required.
A door-open fault display icon, and relay output
provide warnings and help ensure that RIS is only
operated when the enclosure is secured shut.
There are threaded mounting holes in the base
of the enclosure. The mounting brackets are supplied with the system.
1.3.2 CABLE GLANDS. Three sealed glands are
provided for cable entry and exit. A socket is
provided at one end to allow the connection of an
optional printer.
1.3.3 MAIN SYSTEM BOARD. The board is
mounted on the rear face of the door and is accessible when the door is open. The red push-button
TEST Mode switch is in the bottom left-hand corner,
as viewed with the door open.
Instruction 2772-0803 Page 1-1
DIP SWITCH 1
DO NOT TOUCH !!
LCD
ADJUST
POT.
EPROMS
DOOR
PROMIXITY
SWITCH
RED TEST BUTTON
REMOTE INTELLIGENT SENSOR - AREA MONITOR
DIP SWITCH 2
ON/OFF SWITCH SW1
VOLTAGE REGULATOR VR1
BATTERY
J5
FILTER
J1
CASSETTE
PRINTER
SOCKET
BATTERY PLUG
RIBBON
CABLE
INTERFACE
CABLE
OPTION
BOARD
B
A
MAIN BOARD
FLOW ADJUST POT.
CABLE GLANDS
TAPE GATE LEVER
TAPE
RESET
BUTTON
LIGHT
LEVEL
ADJUST
Figure 1-2. Door Open and Cover Removed from Back of Door
PNEUMATIC
HOSES AND
CONNECTOR
DOOR SWITCH
MAGNET
ADJUSTMENT
MECHNICAL
CHASSIS
On the main board are mounted several potentiometers and ‘dip’ switches. These should not normally be touched, particularly dip switch 1.
However, a potentiometer (POT) is provided for user
adjustment of the pump flow rate. The location of
the POT is shown in Figure 1-2 and an explanation
of how the flow rate is adjusted is provided in
Section 4.5.
System operating software is stored in two
EPROM’s that are fitted on the board and marked
with the version number. These devices should not
be normally touched or removed except if a factory
upgrade is received.
The main board is protected by a black molded
cover held on by two screws and two pegs.
1.3.4 SYSTEM POWER SWITCH SW1. RIS
operation is controlled by a switch mounted on the
base board. SW1 is located at the top left of the
right hand unit, see Figure 1-2.
When SW1 is ‘OFF’, the system is off. With the
switch ‘ON’, the system will operate from the external 12 volts input, or the systems back-up battery if the external power is disconnected, or fails.
1.3.5 MECHANICAL CHASSIS. This subassembly carries the optic block and its associated
PCB, the tape drive mechanism and take-up drive
clutch.
Also mounted on the chassis is the pump, with
the pneumatic elements and plumbing necessary for
the track switching and purge functions. The tape
cassette is mounted directly on the front face of the
chassis.
1.3.6 BACK-UP BATTERY. The lead acid battery is
located immediately above the mechanical chassis and is
secured to the system base board with metal clips. It is
connected to the system via a short cable plug and
socket (J5).
The battery is automatically ‘float charged’
whenever the RIS is connected to a 12 VDC supply.
The battery is charged with SW1 off or on. If the
RIS supply fails, the back-up battery will keep the
system running for 2-3 hours. The support time
depends upon the system type, specification, and the
battery condition.
If the RIS is being shipped, or will remain unused
and disconnected from the input supply for more than a
few days, it is good practice to disconnect the battery, at
the plug and socket.
NOTE: If the internal system switch, SW1,
is left on and the RIS input supply is
disconnected, the battery will discharge.
If the RIS input supply is disconnected, the
battery will discharge, irregardless of SW1
being on or off.
1.3.7 BASE BOARD. This is a printed circuit
board fixed to the base of the enclosure. It provides
the interconnection between the subassemblies
mounted on it and the main circuit board on the door.
Other circuit elements located on this board
include; the analog output, solid state output
‘relays’, interface terminal strip J1, voltage regulator potentiometer VR1 and system switch SW1.
The current Phase 2 boards have 3 solid state
‘relay’ devices. Terminal identification and numbering have varied and the appropriate interface
diagram should be used. Both versions are shown in
Figure 2-3.
NOTE: The earlier (Phase 1) versions
(Produced before April '92) are described in
Supplement A, in the rear of this manual.
The 3 ‘relay’ devices are standard, but only one
‘relay’ output is active and available unless the
optional Alarm Relay PCB (Section 5.5) is installed.
Page 1-2 Instruction 2772-0803
REMOTE INTELLIGENT SENSOR - AREA MONITOR
1.3.8 SAMPLE INLET. The sample is brought
into the RIS through the short length of black FEP
tube and into the optic block. There are two types of
input tube; one has a single 0.25 inch (6 mm)
diameter tube, the other is a double tube arrangement used for systems that monitor aerosols.
NOTE: It is essential that the input tube is
correctly fitted, if incorrectly fitted, the
measurement will be inaccurate (Figures
2-4 & 2-5).
Instruction 2772-0803 Page 1-3
REMOTE INTELLIGENT SENSOR - AREA MONITOR
NOTES
Page 1-4 Instruction 2772-0803
REMOTE INTELLIGENT SENSOR - AREA MONITOR
2 INSTALLATION AND
SYSTEM CHECK
The RIS may be installed inside or out. It
should be mounted and connected according to the
instructions provided below, and in an environment
that is within the specified limits detailed in the
Product Specification.
WARNING
Failure to comply with these recommendations may void the warranty.
2.1 UNPACKING
Carefully check for shipping damage by examination inside and out. In case of damage, retain
packing and make an appropriate claim against the
carrier.
2.2 BATTERY CONNECTION
Open the RIS door with the key provided and
reconnect the battery lead at J5 (see Figure 1-2).
NOTE: Do not turn the main system
switch, SW1, on at this stage.
2.4 ELECTRICAL INSTALLATION
2.4.1 CABLE RECOMMENDATION. When
deciding cable size and length, the following criteria
should be used.
The maximum permissible volt drop across
supply cables and termination at an assumed
500 mA = 1 volt. Therefore cable length and size
should be selected so that the maximum resistance
of cable and termination is 2 Ohms.
This requirement is achieved by the cable
recommendations given below. The voltage measured at J1 terminals 1 and 2 with a system taking a
‘normal’ current of 150-250 mA should be not less
than 11.5 volts.
The following guidance on cable size and maximum length should be observed:
2.4.1.1 PSU to RIS Input. 18 AWG stranded,
screened, copper wire x 300 ft. maximum, or 16 AWG
stranded screened copper wire x 450 ft. maximum.
2.4.1.2 PSU to Alarm Module. 18 AWG stranded,
screened, copper wire x 600 ft. maximum, or 16 AWG
stranded screened copper wire x 900 ft. maximum.
2.3 MECHANICAL INSTALLATION
See Figure 2-6 for enclosure dimensions and
mounting points. When deciding mounting arrangements and position, consider the following requirements:
It should be possible to fully open door for
cassette replacement, service and maintenance.
Adequate clearance is required for connection
of external wires and pipes through the glands
provided.
RIS must be located so that the sampling
input tube(s) does not require extending (Section
2.6).
The mounting position should be such that
the installation of other equipment will not subsequently interfere with enclosure access.
It should not be possible for strong light,
natural or artificial, to shine directly up the input
tube(s). Servicing will be aided if suitable lighting is
provided.
NOTE: Ensure the sample inlet tube(s) are
correctly inserted in the optics block (see
Figures 2-4 & 2-5).
2.4.1.3 RIS Relay Output to Alarm Module.
Approximately 5,000 ft. maximum of 18 AWG
stranded, screened, copper wire.
2.4.1.4 0 - 1V Analog Output. Dependent upon the
input impedance of the device being driven. Check
with manufacturer. As guidance, with a device
having an input impedance of 10 megohm, a run of
up to 1,000 ft. of 18 AWG stranded, screened, copper
wire should be satisfactory.
2.4.1.5 4 - 20 mA Analog Output. 18 AWG
stranded, screened, copper wire x 500 ft. maximum.
2.4.2 POWER SUPPLY AND INPUT CONNECTIONS. The power supply enclosure can be mounted
adjacent to the RIS, or in some other convenient
location. Advice on power supply selection is provided in Section 2.5.
Connect the 12 volt DC input from the external
power supply to the J1 interface terminals #1 (0V)
and #2 (+12V). Connect external devices/alarms as
required.
Instruction 2772-0803 Page 2-1
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