Page 1
GasPoint
Gas Transmitter
4-20 mA Fixed Gas Gas Monitor
Installation and Operating Instructions
Page 2
Limited Warranty & Limitation of Liability
BW Technologies LP (BW) warrants this product to be free from defects in material and workmanship under normal use and service for a
period of two years, beginning on the date of shipment to the buyer. This warranty extends only to the sale of new and unused products to
the original buyer. BW’s warranty obligation is limited, at BW’s option, to refund of the purchase price, repair, or replacement of a defective
product that is returned to a BW authorized service center within the warranty period. In no event shall BW’s liability hereunder exceed the
purchase price actually paid by the buyer for the Product.
This warranty does not include:
a) fuses, disposable batteries or the routine replacement of parts due to the normal wear and tear of the product arising from use;
b) any product which in BW’s opinion, has been misused, altered, neglected or damaged by accident or abnormal conditions of
c) any damage or defects attributable to repair of the product by any person other than an authorized dealer, or the installation of
unapproved parts on the product; or
The obligations set forth in this warranty are conditional on:
a) proper storage, installation, calibration, use, maintenance and compliance with the product manual instructions and any other
applicable recommendations of BW;
b) the buyer promptly notifying BW of any defect and, if required, promptly making the product available for correction. No goods shall be
returned to BW until receipt by the buyer of shipping instructions from BW; and
c) the right of BW to require that the buyer provide proof of purchase such as the original invoice, bill of sale or packing slip to establish
that the product is within the warranty period.
THE BUYER AGREES THAT THIS WARRANTY IS THE BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. BW SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, WHETHER ARISING FROM BREACH OF WARRANTY OR
BASED ON CONTRACT, TORT OR RELIANCE OR ANY OTHER THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or
consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this warranty is held
invalid or unenforceable by a court of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.
BW Technologies LP BW America BW Europe
2840 – 2nd Ave. SE 3279 West Pioneer Parkway 5 Canada Close,
Calgary, AB Arlington, TX Banbury, Oxfordshire
Canada T2A 7X9 USA 76013 United Kingdom OX16 2RT
operation, handling or use;
Page 3
Table of Contents
Title Page
Safety Information – Read First ............................................................................................................ v
Contacting BW Technologies................................................................................................................ v
Introduction............................................................................................................................................ 1
Installation .............................................................................................................................................3
Operation............................................................................................................................................. 13
Calibration ...........................................................................................................................................16
Maintenance........................................................................................................................................ 18
Specifications ...................................................................................................................................... 20
Replacement Parts and Accessories.................................................................................................. 23
Manufacturer’s Notes and Warnings ..................................................................................... v
Sensor Location..................................................................................................................... 3
Mounting the Enclosure......................................................................................................... 4
System Design Specifications ............................................................................................... 5
Cable Installation ................................................................................................................... 5
4-20 mA Loop Installation...................................................................................................... 6
Relay Cable Installation......................................................................................................... 6
Connecting the Controller and Power Supply .......................................................................6
Remote Sensor Separation Kit .............................................................................................. 6
Mounting the Sensor Separation Kit Enclosure..................................................................... 8
Factory Settings..................................................................................................................... 9
Dip Switch Overview.............................................................................................................. 9
Changing the Alarm and Calibration Gas Setpoints.............................................................. 9
Dip Switch Settings.............................................................................................................. 10
Connecting the Controller and Power Supply .....................................................................11
Controller Calibration ........................................................................................................... 11
Changing the Alarm Setpoints............................................................................................. 12
Changing the Calibration Gas Concentration Level ............................................................ 12
Changing the Low Alarm Setpoint....................................................................................... 12
Changing the High Alarm Setpoint ...................................................................................... 12
Gas Alarm Conditions and Advice....................................................................................... 14
Fault Alarm Conditions and Advice .....................................................................................15
Guidelines............................................................................................................................ 16
Remote Calibration ..............................................................................................................16
Calibration Procedure .......................................................................................................... 17
Cleaning a Sensor ............................................................................................................... 18
Clearing a Sensor ................................................................................................................ 18
Troubleshooting ................................................................................................................... 18
Servicing the GasPoint ........................................................................................................ 19
Sensor Assembly Replacement ..........................................................................................19
Other Component Replacement.......................................................................................... 19
Sensor Specifications .......................................................................................................... 20
Relative Sensitivity of Combustible Gases/Vapors .............................................................21
Specifications....................................................................................................................... 22
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Gas Point
User Manual
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List of Tables
Table Title Page
1. Ratings and Certification........................................................................................................ 1
2. GasPoint Monitor .................................................................................................................. 2
3. Control Bay ............................................................................................................................ 2
4. Liquid Crystal Display ............................................................................................................ 2
5. Transmitter with Catalytic/IR Combustible Sensor ................................................................ 5
6. Transmitter with Toxic/Oxygen Sensor.................................................................................. 5
7. Distances for Sensor Separation Kit...................................................................................... 6
8. Factory Default Settings; Select Measuring Ranges............................................................. 9
9. Dip Switches ........................................................................................................................ 10
10. Alarms..................................................................................................................................14
11. Fault Conditions................................................................................................................... 15
12. Calibration Diagnostics Protection....................................................................................... 16
13. Troubleshooting Tips ........................................................................................................... 18
14. Sensor Wiring Configuration................................................................................................ 19
15. GasPoint Replacement Parts ..............................................................................................19
16. Operating and Calibration Specifications ............................................................................ 20
17. Catalytic Sensor Relative Sensitivity of Common Combustible Gases/Vapors .................. 21
18. Standard Model IR GasPoint Relative Sensitivity to
Applicable Combustible Gases/Vapors
............................................................................... 21
List of Figures
Figure Title Page
1. GasPoint Monitor ................................................................................................................... 2
2. User Interface ........................................................................................................................2
3. Liquid Crystal Display ............................................................................................................ 2
4. Outline Drawing ..................................................................................................................... 4
5. System Wiring Diagram......................................................................................................... 7
6. Sensor separation Kit Wiring Diagram ..................................................................................8
7. Applying Gas to the Sensor................................................................................................. 16
8. Assembly Drawing............................................................................................................... 19
9. Sensor Wiring Diagram........................................................................................................ 19
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Gas Point
User Manual
iv
Page 7
Safety Information – Read First
IMPORTANT
Users of the GasPoint (“the transmitter”) require a full understanding of the operating and maintenance instructions. Use the
transmitter only as specified in this manual, otherwise the protection provided by the transmitter may be impaired. Read the
following Warnings and Cautions before using the transmitter.
a Warnings
⇒ Do not paint the sensor assembly or the transmitter.
⇒ Calibrate the transmitter at start-up and BW recommends a calibration check on a regular schedule, once at least
every 90 days. More frequent checks or inspections are encouraged to spot problems such as mud collections on
the sensor head, accidental painting over the sensor head, etc.
⇒ Do not use the transmitter if it is damaged. Before you use the monitor, inspect the case. Look for cracks or
missing metals or plastics. If the transmitter is damaged or something is missing,
immediately.
⇒ Make sure the cover is properly fastened before you operate the transmitter.
⇒ Use only a sensor assembly specifically designed for your GasPoint model. Refer to
Accessories.
⇒ Periodically test the sensor’s response to gas by exposing the monitor to a targeted gas concentration that
exceeds the high alarm setpoint. Manually verify that visual alarms are activated.
⇒ Opening the sensor will invalidate the calibration.
a Cautions
Do not expose the monitor to electrical shock and/or severe continuous mechanical shock.
⇒
⇒ Do not attempt to disassemble, adjust, or service the monitor unless instructions for that procedure are contained in
the manual and/or that part is listed as a
⇒ Do not allow liquids to condense and/or use high power sprays on the instrument.
⇒ The warranty will be voided if customer personnel or third parties damage the monitor during repair attempts. Non-BW
Technologies repair/service attempts void this warranty.
IMPORTANT
replacement part.
contact BW Technologies
Replacement Parts and
The GasPoint is only to be used for the purposes specified in this manual. BW Technologies’ authorized service representatives and
parts must be employed in carrying out repairs to the unit in order to maintain the validity of the warranty. Modification of
components, use of non-BW parts, or use of incomplete or used parts will also invalidate the warranty.
CAUTION: FOR SAFETY REASONS THIS EQUIPMENT MUST BE OPERATED AND SERVICED BY QUALIFIED
PERSONNEL ONLY. READ AND UNDERSTAND INSTRUCTION MANUAL COMPLETELY BEFORE OPERATING OR
SERVICING.
Contacting BW Technologies
To contact BW Technologies, call: Address correspondence to:
USA: 1-888-749-8878 BW Technologies LP
Canada: 1-800-663-4164 2840 – 2 Avenue S.E.
Europe: +44 (0) 1295 700300 Calgary, AB T2A 7X9
Other countries: +1-403-248-9226 CANADA
ISO 9001
Email us at: info@bwtnet.com
Visit BW Technologies’ website at:
www.gasmonitors.com
Manufacturer’s Notes and Warnings
1. Read the Safety Warnings and Cautions at the beginning of this manual.
2. The GasPoint is fully tested and calibrated in the factory. Installation of the GasPoint should be done by qualified personnel
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GasPoint
Introduction
The GasPoint (“the transmitter”) provides continuous monitoring of the atmosphere for hazardous gases in the workplace and is
virtually maintenance-free. Its revolutionary design utilizes advanced microcontrollers and allows for enhanced diagnostics and fault
analysis. Advanced design features make installation and operation simpler than ever, saving you time and money.
The transmitter provides a 4-20 mA output signal which can be connected to any control system (DCS, PLC, etc.). Designed with
non-volatile memory, the transmitter has total memory retention.
The pushbutton, non-intrusive calibration can be easily performed by one person with no tools or magnet keys. Normally, only a
periodic calibration check is needed to assure dependable performance. The backlight automatically activates in low light conditions
and in an alarm condition.
The LCD is an intuitive user interface, indicating the following:
• When a toxic or combustible sensor has “failed” its self-test;
• Gas type monitored and concentration level (%LEL or ppm);
Alarm level (field settable) and the type encountered (low, high, or fault);
•
• When to apply gas during calibration; and
• When a toxic or combustible sensor has “failed” its self-test.
The flexibility of the transmitter’s modular design affords efficient installation. Wiring of the transmitter itself is straightforward. Field
interchangeable plug-in sensor assemblies enable the user to change the gas monitored at any time. The transmitter recognizes the
sensor installed and tests and resets itself to that sensor type.
The poison-resistant sensors have the fastest response times available. The transmitter is capable of responding to a momentary
puff of gas that would otherwise remain undetected. The sensors have a proven history of reliable, long-term performance and are
relatively unaffected by temperature or humidity variations. Gas enters the transmitter’s sensor by convection and diffusion through
a sintered stainless steel or wire-mesh screened opening.
The transmitter’s explosion-proof design allows operation in areas where the combustible gas concentration may exceed the lowerexplosive limit (LEL). Its rugged construction ensures a long life span in almost any environment.
The transmitter incorporates the best of both proven and new technologies that offer versatility in addition to reliable safety
mechanisms.
n
Table 1. Ratings and Certification
All gases, except Cl2, ClO2, and HCl
Approved by CSA (Canadian Standards Association) for use in both the USA and Canada
Class I, Div. 1, Groups B, C, D
Class II, Groups E, F, G (Toxic only)
Combustible Performance Standards: ANSI/ISA. ISA—S12.13
CSA: C22.2 No 152
GasPoint Cl2, ClO2, and HCl
Approved by CSA (Canadian Standards Association) for use in both the USA and Canada for ordinary locations
Approved Non-Incendive for installations in Class I, Division 2, Groups B, C, D
Location’s when both input power and relay outputs are connected to non-incendive sources not to exceed
32 Vdc (power input) and 24 Vdc (relay output)
CSA: C22.2 No.213, UL: 1604
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GasPoint
User Manual
a Warning
Opening the sensor
will invalidate the
Figure 1. GasPoint Monitor
Table 2. GasPoint Monitor
Item Description
1 Cable conduit access
2 Explosion-proof enclosure
3 Sensor
4 Calibration pushbutton
Figure 2. User Interface
Table 3. Control Bay
Item Description
1 Edit buttons
2 OK button
3 Faceplate security screw
4 Low light sensor
5 High/Low alarm settings
6 Slip Hinge
Table 4. Liquid Crystal Display
Item Description
1 Numeric reading
2 Units of measure (ppm or %)
3 Alarm level/type
4 Increment/decrement prompt arrows
5 Set value arrow prompts
6 Sensor advice
7 Span advise icon
8 Automatic zero advise icon
9 Apply gas advise icon
Figure 3. Liquid Crystal Display
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GasPoint
Installation
Installation
Sensor Location
Several factors should be considered when selecting locations to install sensors. The following general suggestions should be
considered to assure the detection of the target gas. Select the most suitable location for each sensor.
Air Currents: If there are fans, wind, or other sources of air movement, gases may tend to rise or collect in certain areas of a
facility. The local air currents should be assessed to aid in selecting the sensor location. Outdoor situation considerations, such as
prevailing winds, should also be accounted for. Air convection can often be more important in determining gas concentrated areas
than factors of vapor density.
Vapor Density: When there are no air currents in the area, sensor placement may be affected where the gas (vapor) to be
monitored is lighter or heavier than air. For gases lighter than air, BW suggests placing the sensor approximately 12 in. (30 cm)
above the level of a potential gas release, or close to the ceiling or roof in indoor installation. For gases heavier than air, BW
suggests placing the sensor 12 in. (30 cm) below the release site, or near the floor or ground. Gases with a density equal to air or
slightly greater than air tend to rise (particularly when air currents are present).
Gas Emission Sources: As a rule, at least one sensor should be located in close proximity to each point where a leak is likely to
occur. This is particularly important when a liquid with a low volatility is being monitored.
Environmental Factors: Designed for rugged outdoor use, consider the following in selecting a location.
• Install sensors where they are protected from wind, dust, snow, water, vibration, and/or shock.
• Observe the operating temperature range of the sensor. Refer to
Sensor Specifications.
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GasPoint
User Manual
Mounting the Enclosure
Modular design simplifies the installation of the transmitter. The transmitter’s main board is mounted to the inner control door, which
is equipped with slip hinges. The transmitter’s back enclosure contains the relays and power board and is equipped with a threaded
3/4 inch NPT conduit fitting outlet and pre-drilled mounting flanges. Power and signal lines connect to the plug-in terminal block on
the power board. The transmitter may be disassembled, simplifying the installation.
a Caution: Qualified personnel should perform the installation according to applicable electrical codes, regulations, and
safety standards. Ensure correct cabling and sealing fitting practices are implemented.
Install the transmitter. The predrilled mounting flanges: I.D. 0.25 on 5.5 inch centers.
It is preferable to attach the transmitter to a wall or bracket, using bolts through the two mounting holes. These mountings, however,
may be omitted if the electrical conduit is sufficiently rigid to support the weight of the transmitter.
Note: The sensor should never be installed pointed upwards.
4
Figure 4. Outline Drawing
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GasPoint
Installation
System Design Specifications
Supply Voltage: 12 to 32 volts
Power Consumption: Catalytic Combustible Sensors: 100 mA @ 24 Vdc
IR Combustible Sensors: 75 mA @ 24 Vdc
Toxic/Oxygen Sensors: 40 mA @ 24 Vdc
Relays: 50 mA per relay (150 mA total)
Memory: Non-volatile memory, a battery back-up is not necessary to retain values in the event of power outages.
Loop Resistance: 650 ohms maximum
Cable: 4-20 mA: 3 conductor, 14 to 24 AWG; Relays: 3 conductor, 14 to 24 AWG
Sensor Separation Kit: 4 conductor, 16 to 22 AWG
Relays: 5 amp at 24 Vdc or 115 Vac SPDT; low, high, and fault
Low/High Relays: Field selectable for normally energized/de-energized; latching/non-latching
Fault Relay: Energized; non-latching
Sensor Separation Kit: Transmission distances (see tables below)
Cable Installation
Transmission Range: The distance the 4-20 mA signal can travel is dependent on several factors including the cable gauge.
Maximum cable resistance is 650 ohms less the controller resistance.
The tables below assume a constant 24 volt power supply (at 20°C) copper wire and a controller resistance of
250 ohms. The signal range from the controller to the transmitter takes into account the return loop.
Note: The BW CR-4000 Controller has a resistance of only 120 ohms.
Table 5. Transmitter with Catalytic/IR Combustible Sensor
(Maximum cable lengths between the controller and transmitter)
Conductor Size
Sq mm AWG feet meters feet meters feet meters feet meters
0.64 22 3,356 1,022 2,368 722 1,830 557 1,491 454
Relays Not Used One Relay Connected Two Relays Connected Three Relays Connected
0.75 20 5,336 1,626 3,767 1,148 2,910 887 2,371 722
1.0 18 8,476 2,583 5,983 1,823 4,623 1,409 3,767 1,148
1.5 16 13,474 4,106 9,511 4,106 7,749 2,240 5,988 1,825
Ic Current Factor
Conductor Size Relays Not Used One Relay Connected Two Relays Connected Three Relays Connected
Sq mm AWG feet meters feet meters feet meters feet meters
0.64 22 6,712 2,045 3,661 1,115 2,517 767 1,917 584
0.75 20 10,953 3,253 5,821 1,774 4,002 1,219 3,049 929
1.0 18 16,953 5,167 9,247 2,818 6,357 1,937 4,843 1,476
1.5 16 26,948 8,213 14,699 8,213 10,105 3,080 7,699 2,346
Ic Current Factor
For other operating parameters use the formula below to establish the transmission range.
Formula: Maximum distance =
where: VP = power supply voltage (minimum)
V
I
R
R
0.12 0.17 0.23 0.28
Table 6. Transmitter with Toxic/Oxygen Sensor
(Maximum cable lengths between the controller and transmitter)
0.06 0.110 0.160 0.210
{((V
— VT)/I
P
)-RC}/(2xR
c
)
L
= transmitter supply voltage (minimum) 12 volt
T
= current through conductor (See Table 5 and 6 for factors)
c
= total controller resistance
C
= line resistance per 350 m (1,160 ft.)
L
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GasPoint
User Manual
4-20 mA Loop Installation
Cable Routing: Separate cables are required for each transmitter. In classified areas the cable should be in conduit or it should
be an approved hazardous location cable.
Power Supply: Ensure power supply meets the minimum requirements of all components of your system
(i.e., alarms, relays, etc.). BW recommends that the power supply be regulated.
a Caution: Polarity must be observed. If the Return and +24 volt wires are reversed, the transmitter will not work. Do not
apply electrical power to the transmitter until all connections are made, the sensor is in place, and the transmitter is
complete.
1. Remove the transmitter cover, open the inner hinged control door and remove, if desired.
2. Attach the conduit, if applicable, and pull cable(s) into the enclosure.
3. Connect the 3-pin power terminal block.
Return (R): 4-20 mA signal to the labeled terminal
Supply (V): (+) positive (12-32 volts) to the labeled terminal
Ground (G): Ground wire to the labeled terminal
Note: (If using shielded cable) To avoid radio frequency interference (RFI), the shield (including Mylar) must be grounded. Simply
tying a bare drain wire to ground does not ground a shield. Keeping the shield as short as possible, tie the shield to the
internal grounding screw. Tie any unused wires to ground.
Relay Cable Installation
The transmitter is equipped with three relays: low gas alarm, high gas alarm, and fault alarm. Select to connect the applicable relays
required in each situation. Relay connections are labeled: NO (normally open), C (common), and NC (normally closed). Attach wires
as required to the applicable terminals.
Note: The fault relay connections are reversed.
Set the alarm dip switches before applying power. Once power is applied, if desired, change the alarm setpoints.
Connecting the Controller and Power Supply
Ensure the transmitter’s external cover is in place before applying power. Follow the procedures and recommendations in the control
systems manual to complete the installation.
1. Ensure the transmitter is tied to the controller ground, to the earth ground, and to the negative terminal of the power supply.
2. Attach wires to the controller and power supply as shown in the wiring diagram. Refer to Figure 5.
Remote Sensor Separation Kit
The transmitter sensor separation kit can be mounted at the following distances dependent of the cable size.
Table 7. Distances for Sensor Separation Kit
Conductor Size
Sq mm AWG feet meters feet meters
0.64 22 619 188.5 1,548 472
0.75 20 985 300 2,463 750
1.0 18 1,564 476 3,912 1,174
1.5 16 2,487 758 6,218 1,895
Catalytic/IR Combustible
Sensor
Toxic/O2 Sensor
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GasPoint
Installation
Figure 5. System Wiring Diagram
Modbus Expansion Module Note: For wiring of GasPoints equipped with the Modbus Communication
Expansion Module, see the Modbus manual for additional wiring information.
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GasPoint
User Manual
Figure 6. Sensor separation Kit Wiring Diagram
Mounting the Sensor Separation Kit Enclosure
1. The separation kit is equipped with predrilled flanges: I.D. 3065 (7.68 mm) on 4.35 in. (10.6 mm) centers.
Disconnect the wires from the transmitter terminal block and remove the sensor from the transmitter. Screw the sensor fully into
2.
the separation kit housing and install the wires, as shown on the diagram, to the adjacent terminal block in the separation kit.
Install cable as shown. Ensure correct cabling and sealing fitting practices are implemented.
3.
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GasPoint
Installation
Factory Settings
The transmitter is calibrated and tested before shipping. Commonly used values are set at the factory. To change the factory default
settings, refer to
Changing the Alarm Setpoints.
The following settings are field selectable:
Dip Switch Overview
1. Calibration Time Delay: To set span, select a time delay of 30 seconds or 6 minutes. For remote calibration use the 6 minute
setting to allow time for the gas to reach the sensor. To save time and calibration gas, the transmitter begins the span
procedure when it senses the calibration gas.
Note: The factory default is 30 seconds. See dip switch 3 (CAL TIME) to change to 6 minutes.
2. Measuring Range: Select from up to four measuring ranges by setting Block 1 switch 4 and switch 5 to open or closed. Both
switch 4 and 5 are factory set to open. Refer to Table 8.
3. Low and/or High Relays: Select non-latching or latching. Factory default is set to open (non-latching).
4. Low and/or High Relays: Select de-energized or energized. Factory default is set to open (de-energized).
Changing the Alarm and Calibration Gas Setpoints
5. Gas Alarms: Gas alarm levels are set to Occupational Safety & Health Administration (OSHA) standards prior to shipping. The
transmitter is equipped with two alarm levels, low and high. To set, select two, one, or no alarm levels and set selected levels to
any value desired. To change the levels, refer to
Changing the Alarm Setpoints. The factory defaults are listed in Table 8.
6. Calibration Gas Concentration Level: To facilitate the auto span, the calibration gas concentration expected is preset. It can
be changed at any time for the toxic and combustible gas sensors. Set the standard generally used in your facility. Refer to
Changing the Calibration Gas Concentration Level to change the value.
The oxygen sensor span is set to 20.9% and cannot be adjusted (For O2 calibrate in normal 20.9% ambient air, or if the
atmosphere may be deficient or enriched, use pure air calibration gas.)
Table 8. Factory Default Settings; Select Measuring Ranges
Select Measuring Range
Gas Sensed
Hydrogen sulfide (H2S) ppm
Carbon monoxide (CO) ppm
Combustibles 0-100% LEL
(Catalytic or IR)
Oxygen (O2) % by vol.
Sulfur dioxide (SO2) ppm
Hydrogen cyanide (HCN) ppm
Chlorine (Cl2) ppm
Chlorine dioxide (ClO2) ppm
Hydrogen (H2) ppm
Hydrogen chloride (HCl) ppm
Ammonia (NH3) ppm
Nitrogen dioxide (NO2) ppm
* BW recommends that the calibration gas factory default values be changed if selecting higher measuring ranges than the factory default measuring range. Refer to
Changing the Alarm Setpoints and Sensor Specifications.
Units of
Measure
%LEL
Factory Default
4. Open
5. Open
1
0 to 100
0 to 500
0 to 100
0 to 30.0%
0 to 100
0 to 20.0
0 to 5.0
0 to 1.00
0 to 100
0 to 10.0
0 to 50
0 to 50.0
Or Select
4. Closed
5. Open
0 to 50 0 to 500 0 to 20 10 ppm 15 ppm 20 ppm
0 to 1000 0 to 100 0 to 50 35 ppm 200 ppm 200 ppm
N/A N/A N/A 10% 20% 50% LEL
N/A N/A N/A 19.5% 18.5% 20.9% ambient/pure air
0 to 50 0 to 20 0 to 10 2 ppm 5 ppm 20 ppm
N/A N/A N/A 4.7 ppm 10 ppm 17 ppm
0 to 10.0 0 to 50.0 0 to 99.9 0.5 ppm 1.0 ppm 3.0 ppm
0 to 5.00 N/A N/A 0.20 ppm 0.30 ppm 0.56 ppm
0 to 200 0 to 800 N/A 30 ppm 50 ppm 100 ppm
0 to 20.0 0 to 99.9 N/A 0.2 ppm 0.5 ppm 6.6 ppm
0 to 100 0 to 500 0 to 999 25 ppm 50 ppm 50 ppm
0 to 10.0 0 to 20 0 to 99.9 2 ppm 5 ppm 10 ppm
Or Select
4. Open
5. Closed
2 3 4
Range LO: 4
Range HI: 5
Or Select
4. Closed
5. Closed
Alarm Setpoints Calibration Gas
Factory Defaults
(Field Settable)
LOW HIGH
Factory Default
Value Level
Expected*
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GasPoint
User Manual
Dip Switch Settings
The dip switches are located on the upper control board. To
access the dip switch banks, remove the top of the
explosion-proof enclosure, loosen the control board access
screw (located just below the buttons), and open the control
door which is on slip hinges. The dip switches are clearly
labeled.
a Caution: The transmitter must be powered down
before removing the outer cover. If it is in a classified
area, either remove the transmitter or declassify the
area.
Note: Any latched relay will be released upon one push of
the external button.
Table 9. Dip Switches
Dip Switch Function
Block 1: Calibration and Measuring Ranges
1 OPT B Not used
2 OPT A Not used
3 CAL TIME
4 RANGE LO Set measuring range
5 RANGE HI Set measuring range
Block 2: Gas Alarm Relay Settings
HI L
1
(High alarm)
LOW L
2
(Low alarm)
3 OPT C Not used
HI E
4
(High alarm)
LOW E
5
(Low alarm)
Calibration wait period
Open - 0.5 min.
Closed - 6 min.
Open - Non-latching relay
Closed - Latching relay
Open - Non-latching relay
Closed - Latching relay
Open - De-energized relay
Closed - Energized relay
Open - De-energized relay
Closed - Energized relay
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GasPoint
Installation
Connecting the Controller and Power Supply
Ensure the transmitter’s external cover is in place before applying power. Follow the procedures and recommendations in the control
systems manual to complete installation.
Note: Ensure the transmitter is tied to the controller ground, to the earth ground, and to the negative terminal of the power supply.
1. Attach wires to the controller and power supply as shown in Figure 5. When power is applied, the transmitter automatically
activates.
2. The LCD shows all the display elements, and the elements flash twice. Then each icon displays separately and stays lit until all
icons are displayed. The LCD backlight then activates.
3. The word Test displays on the LCD. The transmitter then begins a 2-minute countdown from 999 to 000.
During the countdown to normal operation the transmitter communicates with the sensor, determines the sensor type, tests the
sensor integrity, tests all the circuitry, and allows the sensor to stabilize before normal operation begins. The transmitter also
determines the sensor range. Once initialization is complete, the transmitter enters normal operational mode (in the system
loop) providing a signal to the controller of the gas present.
4. After the countdown, the LCD displays the current low alarm and high alarm setpoints. Each alarm setpoint is displayed for
4 seconds. To review them, press and release the external pushbutton after normal operation begins.
5. Upon a successful self-test, the transmitter enters normal operation and displays the ambient gas present. The backlight remains
activated for 5 seconds after normal operation begins. If the unit fails the self-test, refer to
Fault Alarm Conditions and Advice.
Controller Calibration
Follow the procedures and recommendations in the control system manual to calibrate the control system.
1. Calibrate the control system (see your control manuals). Set the controller as follows:
• 4 mA = ZERO
• 20 mA = FULL SCALE
2. Calibrate the transmitter with gas and then refer to
Changing the Alarm Setpoints and Calibration Gas Setpoints
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GasPoint
User Manual
Changing the Alarm Setpoints
The setpoint mode allows the user to change the calibration gas concentration level, the low alarm setpoint, and the high alarm
setpoint. Refer to
1. Screw off the enclosure top. (Allows access to edit buttons.)
2. Press the OK button for 2 seconds to access setpoint mode and change factory default settings.
The transmitter is equipped with two setpoints, low and high. If only one setpoint is required, set one level to zero to
deactivate. Set the other setpoint as desired.
To deactivate both alarm levels, set both setpoints to zero. If both low and high are set to the same value, the transmitter will
trigger a high alarm condition if that setpoint is met or exceeded.
Factory Settings for factory default settings. To change the values:
Changing setpoint LCD icons displayed Display
Changing the Calibration Gas Concentration Level
The LCD first displays the current calibration gas value. Press OK to
accept the displayed value or proceed to change the value. The
factory default value for O
1. Press ▲ to increment the value or ▼ to decrement the value.
2. Press OK to accept the new displayed value and end set
calibration gas level.
is set for 20.9% and cannot be adjusted.
2
Changing the Low Alarm Setpoint
The next screen displays the current low alarm setpoint. Press OK to
accept the current low alarm setpoint or proceed to change the
value.
1. Press ▲ to increment the value or ▼ to decrement the value.
2. Press OK to accept the new displayed value and end set low
alarm setpoint.
Changing the High Alarm Setpoint
The next screen displays the current high alarm setpoint. Press OK
to accept the current high alarm setpoint or proceed to change the
value.
1. Press ▲ to increment the value or ▼ to decrement the value.
2. Press OK to accept the new displayed value and end set high
alarm setpoint.
Note: Oxygen low and/or high gas alarm setpoints can be set to either enrichment and/or deficiency alarms as desired. If the alarm
setpoint is set below 20.9% (deficiency alarm), an alarm is triggered if the concentration present is below 20.9%. If the alarm
setpoint is set above 20.9% (enrichment alarm), an alarm is triggered if the concentration present exceeds 20.9%. You can
choose to set both alarms above or below 20.9%, or one alarm above and one below 20.9%
• Numeric display shows
current calibration gas
value expected
• Set Span icon flashes
• K flash
• ▲▼ flash
• Numeric display shows
current low alarm setpoint
• LOW ALARM set icon
flashes
• ▲▼ flash
• Numeric display shows
current high alarm setpoint
• HIGH ALARM set icon
flashes
• ▲▼ flash
3. Test the transmitter using a gas cylinder other than the one used in the calibration steps. The gas concentration should not
exceed the sensor’s detection range. Confirm that the display shows the expected concentration.
12
Page 21
GasPoint
Operation
Operation
The transmitter provides continuous monitoring for the target gas. In the event of power failure, the
transmitter will automatically reset itself back into the system loop after power is restored. The transmitter
has non-volatile memory and will not be affected by a power disruption. All programmed information is
protected with total memory retention.
Note: BW recommends the transmitter be calibrated before first time use.
LCD: The LCD diplays the current ppm or % reading of the target gas present.
View Alarm Setpoints: To view the alarm setpoints at any time, press the external pushbutton (for one
second) and release. The LCD displays the current low alarm setpoint and then the high alarm setpoint.
Relays:
Fault: The fault relay is always energized under normal operations. The relay will de-energize only if the transmitter is
•
addressing a fault condition or when power is released.
Low/High Gas Alarms: The gas alarm relays connected are energized or de-energized (latching or non-latching) according to
•
the transmitter dip switch settings you have selected.
Reset Latched Relay Alarm (Alarm Acknowledge): If a gas alarm relay has been set to latching mode, acknowledge the
•
alarm condition.
Press the external pushbutton for one second until the display reads low alarm setpoint, then release the external button. The
transmitter releases the latched alarm(s) and displays the current low and high alarm setpoints.
Note: If an alarm condition exists, the transmitter will not allow the user to reset a latched alarm or display the alarm setpoints.
Output: The 4-20 mA loop output is normal (from 4 to 20 mA according to calibrated values) except in a fault condition.
Backlight: The backlight activates in low light conditions. When ambient light conditions return to normal, the backlight automatically
deactivates.
13
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GasPoint
User Manual
Gas Alarm Conditions and Advice
If the current gas concentration meets or exceeds either alarm setpoint, the transmitter gas alarm functions will activate.
Note: If both or either gas alarm is set to zero, then no gas alarm condition exists for that alarm level.
The following alarm advice activates in any gas alarm condition (low or high):
The backlight activates.
•
•
The 4-20 mA loop output is normal (from 4 to 20 mA according to calibrated values).
When the alarm condition no longer exists, the transmitter exits alarm mode and enters normal operation.
Note: If a relay is set to the latching position on either low or high gas alarm, the relay remains on until the alarm is reset
(acknowledged). Press the external button to reset the relay.
If the alarms are disabled, then no alarm icons will be displayed.
An oxygen alarm level depends on which alarm setpoints have been set to low and high. The oxygen low and/or high gas
alarm setpoints are user selectable for either enrichment and/or deficiency alarms as desired.
a Caution: High off-scale readings may indicate an explosive concentration.
Table 10. Alarms
Alarm condition Alarm relay Alarm Display
LOW GAS ALARM
The current gas
concentration present meets
or exceeds the low alarm the
low alarm setpoint
Low alarm relay triggers
field interface if the relay is
connected and a low alarm
setpoint is entered.
• Numeric display will
show the gas
currently presnet
(ppm/%)
• LOW icon displays
• ALARM icon flashes
HIGH GAS ALARM
If the current gas
concentration present meets
or exceeds the high alarm
setpoint
OVER RANGE (over level
or over range) GAS
High alarm relay triggers a
field interface if the relay is
connected and a high alarm
setpoint is entered.
• Numeric display will
show the gas
currently present
(ppm/%)
• HIGH icon displays
• ALARM icon flashes
• OL icon displays
• HIGH icon displays
CONDITION
If the gas concentration
meets or exceeds the full
measuring range
14
Page 23
GasPoint
Operation
Fault Alarm Conditions and Advice
In the event of a fault condition, the fault alarm triggers activating any connected field interface. The transmitter advises which fault
condition has occurred.
Under the fault alarm conditions:
•
The non-latching fault relay is activated (de-energized) during a fault condition.
• The backlight activates.
When the problem is corrected, the transmitter automatically returns to normal operation.
Table 11. Fault Conditions
Fault Condition
Sensor Self-Test Fail
4-20 mA
Output
2.00 mA
(At start-up, the self-test has
failed)
Sensor Fault 2.00 mA
• Three (3) bars flash on the numeric display
• FAULT icon displays
• ALARM icon flashes
• Sensor Fail icon displays
• Numeric display will read the last value
(ppm/%) present before sensor fault occurs
LCD Icons Displayed Display
• FAULT icon displays
• ALARM flashes
• Sensor Fail displays
Sensor Drift 2.00 mA
• Numeric display reads 00
• FAULT icon displays
• ALARM icon flashes
• Sensor Error icon displays and flashes
15
Page 24
GasPoint
User Manual
Calibration
Guidelines
When calibrating the transmitter, adhere to the following guidelines.
• Calibration accuracy is never better than the calibration gas accuracy. BW Technologies recommends a premium-grade
calibration gas. Gases with National Institute of Standards and Technology (NIST) traceable accuracy improves the validity of
the calibration. Do not use a gas cylinder beyond its expiration date.
• Calibrate a new sensor before use. Allow the sensor to stabilize before starting calibration (approximately 5 minutes).
• Calibrate the transmitter on a regular schedule. (BW recommends once every 90 days (3 months), depending on use and
sensor exposure to poisons and contaminants.)
• Calibrate the transmitter if the ambient gas display value varies at start-up.
• It is best to calibrate the sensor before changing the alarm setpoints.
• Calibrate only in a clean atmosphere, which is free of target gas.
• Use teflon or stainless steel hose on all electrochemical sensors.
• Tygon will poison a catalytic combustible sensor over time.
a Warning
Opening the sensor will invalidate the calibration
Table 12. Calibration Diagnostics Protection
If calibration is incomplete, the transmitter automatically returns to normal operation and all prior (former) calibration data is
retained. Common cause for the transmitter to refuse calibration or for an incomplete calibration include the following:
Background interfering gas is present
If interfering gas is present during auto zero, the transmitter
refuses to auto zero and exits the calibration routine.
Calibration gas cylinder runs empty during calibration
Calibration gas concentration is too low or too high
Calibration gas concentration is not within expected
parameters—either the concentration of applied gas (ppm or %)
is too high or too low.
The transmitter refuses to set span if the calibration gas is not
within the expected parameters and exits the calibration routine.
Gas applied at the wrong time
Gas is applied before requested to do so, or if gas is applied
during auto zero, the transmitter refuses to proceed and exits the
calibration routine. The prior (former) auto zero value will be
retained.
Combustible and Toxic sensors: wait for the transmitter to
return to normal operation. Then apply pure air (zero gas) and
repeat calibration.
Wait for unit to return to normal operation. Replace the empty
gas cylinder with a full cylinder and repeat calibration.
Change the value to equal the calibration gas concentration
being applied.
Restart the calibration routine and apply gas only when the gas
cylinder icon flashes.
Remote Calibration
The length of time depends on the length of hose the
calibration gas must travel. If the wait period is longer than 30
seconds, the CAL TIME dip switch must be set to 6 minutes.
To save gas and time, the transmitter begins to span when it
senses calibration gas.
Apply the calibration gas for approximately 2 minutes plus the
time estimated for the gas to reach the sensor.
16
Figure 7. Applying Gas to the Sensor
Page 25
GasPoint
ration Calib
Calibration Procedure
The transmitter provides continuous monitoring for the target gas. In the event of power failure, the transmitter automatically resets itself
back into the system loop after power is restored. The transmitter has non-volatile memory and will not be affected by a power
disruption. All programmed information is protected with total memory retention.
For calibration gas concentrations and flowrates for each gas, refer to Table 16.
Calibration steps LCD icons displayed Display
START CALIBRATION
1. Press and hold the external button down while
the LCD displays the high and low alarm
setpoints. Continue to hold the button until the
LCD displays CAL and the CAL icon lights for
3 seconds. Then release the button.
Note: The 4-20 mA output will be 3mA throughout
calibration. Calibrating the transmitter will not
cause false alarms at the controller
AUTO ZERO
2. The transmitter then takes a zero level
reading.
• Combustible and Toxic sensors: If target
• First, the low and high
alarm setpoints are
displayed (8 seconds
approximately)
• Next the CAL icon
displays for 3 seconds
• Backlight is activated
• Numeric display reads
00
• Auto zero icon
flashes
Auto Zero Auto Zero Fail
gas is present, apply zero gas (pure air
or 100% nitrogen) to zero the sensor.
Restart the calibration sequence.
• Oxygen sensor: Gas is not required. Auto
zero sequence takes 30 to 60 seconds.
AUTO SPAN
3. Insert calibration cap. Refer to Figure 7 and
apply gas to the sensor for approximately 2
minutes (5 minutes for ammonia). Refer to
Table 16 for gas concentrations and flowrates.
4. When the countdown from 300 to 00 begins,
span is complete. Disconnect the gas cylinder.
• If Span fails: check the calibration gas cylinder
used and the concentration expected.
Replace the cylinder and/or change the
calibration gas expected, if required.
Recalibrate
• Oxygen sensor: Use pure air calibration gas
(20.9 % O
) in case of deficient or enriched
2
atmosphere.
CALIBRATION FAIL OR ERROR
Auto zero Fail: If the Fail icon displays, the LCD
displays a countdown from 300 to 00, before the
transmitter begins normal operation.
Auto Span Error: If the Error icon displays, the
LCD displays a countdown from 300 to 00, before
the transmitter enters normal operation.
Note:If either fail condition occurs, all previous
information values are retained. Retry calibration
• Numeric display
shows calibration
gas value expected
Auto Span Auto Span
Error
• K flashes
• Span icon displays
• Gas type is
constantly displayed
• After a successful
calibration, the
transmitter
automatically returns
to normal operation
and displays the
current reading (ppm
or %) present.
Auto Zero: If the target or an interfering gas is present, the transmitter
refuses to auto zero. The Fail icon displays. The Fail icon also displays if the
external pushbutton is pressed during auto zero.
Span: If the calibration gas is not within expected values, the transmitter
refuses to span. The Error icon displays.
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GasPoint
User Manual
Maintenance
To keep the transmitter in good operating condition, perform the following basic maintenance as required:
• Calibrate, test, and inspect the transmitter at regular intervals and after exposure to high concentrations.
• Keep an operations log of all maintenance, calibrations, and alarm events.
• Clean the exterior with a soft, damp cloth. Do not use solvents, soaps, or polishes.
• Do not immerse the transmitter in liquids.
Cleaning a Sensor
The sensors are equipped with a stainless steel sintered or a hastelloy sintered flame arrestor screen (dependent on gas). Clean
only with a dry brush being careful not to clog the screen. Replace the sensor if the screen is plugged.
Clearing a Sensor
The sensor has a high degree of resistance to common vapors and gases. The sensor most likely clears itself if you remove the
transmitter to a clean environment and wait 10 to 30 minutes. Do not expose a sensor to the fumes of inorganic solvents (such as
paint fumes) or organic solvents.
Troubleshooting
With enhanced diagnostics the transmitter provides extensive fault analysis and fault advice, refer to Fault Alarm Conditions and
Advice. The troubleshooting chart deals with other factors and is to be used as a guide. Prior to reaching any conclusion that a
problem may exist, check the following:
•
All terminal blocks are fully seated on the boards.
Power and signal connections are correct and complete.
•
No response to gas
Apparent false alarm
No signal at controller
Table 13. Troubleshooting Tips
Problem Possible Cause Solution
• Sensor screen dirty • Clean or replace sensor
• Puff of gas
• Not properly calibrated
• Solvent fumes or interference from high
levels of interfering gas
• Radio frequency interference
• Maximum distance reached
• Controller does not operate
• Monitor is functioning
• Recalibrate
• Remove source
• Check grounds and shielding are correct
• Verify loop resistance, change wire
AWG, or increase supply
• Troubleshoot controller
18
Page 27
GasPoint
Servicing the GasPoint
Servicing the GasPoint
Disassembling: Observe all safety and electrical codes and regulations before removing front cover. Unscrew the thumbscrew and
open the service bay door.
Assembling: When reassembling the transmitter, ensure that it is electrically complete. Close the service bay door. Ensure the
thumbscrew is aligned and tighten it down. Replace the outside glass cover. Reapply power and reinitialize the transmitter’s powerup procedure, refer to
Connecting the Controller and Power Supply. Change the alarm setpoints if desired.
Important: Calibrate the transmitter whenever a component is replaced.
Sensor Assembly Replacement
To replace the entire sensor assembly, complete the
following steps:
1. Power down the transmitter.
2. Disconnect the wires from the 4-pin plug-in terminal block
at J5 on the power board and remove the old sensor.
3. Feed the new wires through the opening. Fully screw in
the new sensor. Attach the wires to the plug-in terminal
block. Ensure that all colored wires are correctly matched
to the board labels from left to right. Refer to Figure 6.
a Caution: Check that all connections are correct.
Incorrect wiring may damage the sensor and/or the
power board.
4. Refer to Table 8 to select a measuring range if required.
Refer to
numbers.
Replacement Parts and Accessories for part
Table 14. Sensor Wiring Configuration
Board Label Wire Color Description
1 Pwr 8 Vdc Red Power 8 Vdc (left)
2 TX Grey Transmission
3 RX White Signal
4 GND Black Ground (right)
Other Component Replacement
1. Power down the transmitter.
2. Unplug the sensor terminal block from the power board
if required.
3.
Replace the component, ensuring all wiring connections
are complete and reassemble as shown in Figure 8.
Refer to
Ensure all field selectable options are set (measuring
4.
range, etc.).
Apply power and reinitialize power-up.
5.
Set the alarm setpoints if required.
6.
Installation
a Warning
Opening the sensor
will invalidate the
calibration.
Figure 9. Sensor Wiring Diagram
Table 15. GasPoint Replacement Parts
Qty Description Rating/TOL Part #
1 1 External faceplate window cover M1147
2 1 Internal hinged door faceplate cover M2345
3 1 Transmitter main LCD board (PCB) E2737/2
4 3 #6-32 x ¼ inch machine Phillips screws M0262
5 1 Threaded stand-off – accepts thumbscrews M2364
6 2 #6-32 x ¼ inch machine Phillips screws M0262
7 1 Plug-in ribbon cable E2800
8 1 Power/relay board (PCB) E2739/1
9 1 Transmitter housing c/w external switch M2346K
10 1 Sensor assembly various
Figure 8. Assembly Drawing
19
Page 28
GasPoint
User Manual
Specifications
Sensor Specifications
Table 16. Operating and Calibration Specifications
IR
Specifications
Repeatability % of signal 1 1 1 1 1 <10 0.5 2 0.1
Temperature Range °C
Relative Humidity Range 0 to 100%
Long Term Drift
% of signal loss per month Span:
LCD Increments 1% 1% 1 ppm 1 ppm 1 ppm 1 ppm 0.1 ppm 0.1 ppm 0.1%
Calibration1
Flow Rate (min). mls/minute
at a % or ppm reading of:
Sensor:
Replacement Part Numbers
Zero:
Combustibles
%LEL
-40 to +50
°F
-40 to +122
Non Condensing
Nominal
<1
250
50% LEL
IR-RW03 SS-RW02 SS-RH02 SS-RM02 SS-RS02 SS-RA02 SS-RZ02 SS-RD02 SS-RX02
1: It is recommended that the calibration gas concentration
for toxic sensors be 50% of the selected measuring range.
(Factory default values are shown.)
Auto span. Values expected by the transmitter for toxic
gases can be changed at any time. Refer to
Alarm Setpoints and Calibration Gas Setpoints section.
2: For oxygen use pure air calibration gas
Note: Performance data is based on conditions at
20°C, 50% RH, 1013 mBar.
Do not adjust the oxygen sensor span value.
Catalytic
Combustibles
%LEL
-40 to +90
-40 to +194
Nominal
<1
250
50% LEL
Changing the
Hydrogen
sulfide
H2S ppm
-40 to +50
-40 to +122
Nominal
<2
250
20 ppm
Carbon
monoxide
CO ppm
-20 to +50
-4 to +122
Nominal
<2
150
200 ppm
Sulfur dioxide
SO2 ppm
-20 to +50
-4 to +122
5 to 95% Non-condensing
Nominal
<2
250
20 ppm
Ammonia
NH3 ppm
-10 to +50
+14 to
+122
Nominal
<2
500
50 ppm
Hydrogen
cyanide
HCN ppm
-20 to +50
-4 to +122
Nominal
<2
250
15 ppm
Nitrogen
dioxide
NO2 ppm
-20 to +50
-4 to +122
Nominal
<2
1,000
10 ppm
Sensors:
Toxic and Oxygen: Electrochemical
Combustible: Catalytic or Infrared (IR)
Position Sensitivity: None
Operation Pressure Range: 900 to 1100 mBar
(atmospheric +/-10%)
Calibration Notes:
For maximum accuracy, calibrate with a mixture in the range
most measurements are made. For most purposes a 2
minute exposure is satisfactory. (NH
need a 5 minute exposure.)
, Cl2, ClO2, and HCl
3
-20 to +50
-4 to +122
Nominal
<1%
250
20.9 %
Oxygen
O2 % v/v
2
20
Page 29
GasPoint
Specifications
Relative Sensitivity of Combustible Gases/Vapors
Recommend: For the most accurate measurements, calibrate using the gas or vapor under investigation. Where this is not
possible see the applicable catalytic or infrared relative sensitivity table for combustible gases/vapors. The transmitter catalytic and
combustible sensors are calibrated to methane (with 50% methane calibration gas) at the factory prior to shipping.
Table 17. Catalytic Sensor Relative Sensitivity of Common
Gas/Vapor Relative
Methane 100 Carbon
Propane 60 Hydrogen 100
n-Butane 60 Ammonia 125
n-Pentane 50 Cyclohexane 50
n-Hexane 40 Ethylene 85
Acetylene 80
Each sensitivity has been rounded to the nearest 5%
Combustible Gases/Vapors
Gas/Vapor Relative
Sensitivity
monoxide
Sensitivity
105
Catalytic Bead Combustible Sensor
The table shows the variation of the catalytic combustible
sensor on exposure to a range of gases and vapors at the
same %LEL concentration. The figures are expressed
relative to the methane signal (=100).
The results are intended for guidance only. For a more
accurate measurement calibrate using the gas or vapor
under investigation.
Special Note on the Combustible Sensor
Certain substances have a detrimental effect on all catalytic
bead sensors. The GP-WD combustible sensor has a higher
degree of poison resistance and will outperform other
catalytic bead sensors in poisonous atmospheres. However,
catalytic sensors should not be exposed for prolonged
periods of time to lead or sulfur containing compounds,
silicones, or phosphates. Damage is cumulative and may
result in an irreversible decrease in sensitivity. Certain other
Table 18. Standard Model IR GasPoint Relative Sensitivity to
Gas/Vapor Relative
cis-Butane-2 450 Propane 410
trans-Butane-2 450 Propanol 230
Ethyl chloride 120* Mythyl chloride 100*
*The relative sensitivity is just an estimate.
This table is intended for guidance only.
Always calibrate using the gas or vapor under investigation.
Applicable Combustible Gases/Vapors
Sensitivity
Acetone 60 n-Hexane 325
n-Butane 450 Methane 100
iso-Butane 450 n-Pentane 390
Butane-1 450 iso-Pentane 390
Ethane 450 Propylene 310
Ethanol 330 o-Xylene 100
Ethylene 80 m-Xylene 100
n-Heptane 325 p-Xylene 100
MEK 365* Methanol 80*
IPA 410* Toulene 25*
Gas/Vapor Relative
Sensitivity
compounds, such as halogenated hydrocarbons and
hydrogen sulfide, may temporarily inhibit the sensor
performance, but in most cases it will recover after a period
in clean air.
Infrared (IR) Combustible Sensor
The standard model IR Combustible GasPoint is calibrated to
methane. The table shows the variation of the IR combustible
sensor on exposure to applicable group combustible
hydrocarbon gases and vapors at the same %LEL
concentration. The figures are expressed relative to the
methane signal (=100).
The results are intended for guidance only. For a more
accurate measurement, calibrate using the gas or vapor
under investigation.
a Caution: IR systems should always be calibrated as
soon as you install the system to compensate for any
change in pressure.
Note: If the hydrocarbon desired is not listed, special models
are available for other groups of hydrocarbons.
For IR sensors, use the specified gas to calibrate the
system. IR sensors work very well in low or no oxygen
conditions. IR sensors monitors the molar
concentration of the specific gases by a physical
method. No chemical reaction takes places inside the
sensor.
21
Page 30
GasPoint
User Manual
Specifications
Monitor: 3-wire, 4-20 mA gas transmitter with advanced micro-controller based circuitry
Power Input: 12 to 32 volts dc
Output Current: Normal Operation: Isolated linear 4-20 mA output
Calibration Mode: Steady 3 mA (automatic reset to normal operation)
Fault Mode: 2 mA signal (and less)
Current Consumption:
Toxic Versions: 40 mA at 24 Vdc
Catalytic Combustible Version: 100 mA at 24 Vdc
Infrared Combustible Version: 75 mA at 24 Vdc
Relays: 50 mA per relay at 24 Vdc
Sensors: Plug-in, logic sensors
Self-Test: Automatic self-test of sensor integrity upon power on
Calibration: Non-intrusive, via pushbutton
Auto Zero and Auto Span
Displays:
LCD 1: 3 digit continuous readout of the gas present (ppm or %LEL)
LCD 2: Alphanumeric diagnostic status display
Alarm Setpoints: Two (2) setpoints - User selectable
Relay Contacts:
Low/High: Field selectable for normally energized/de-energized and latching/non-latching
Fault: Normally energized and non-latching
Controls:
Calibration: Non-intrusive via external pushbuttonM
Alarm Setpoints: Simple up/down pushbuttons with LCD readout of setpoints
Physical:
Size (w x l x h): 6.8 x 7 x 4.3 in. (17 x 17.8 x 10.8 cm) including sensor
Weight: 4.85 lb. (2.2 kg) approximately
Enclosure: Explosion-proof, anodized aluminum enclosure c/w mounting flanges
Sensor: Stainless steel enclosure
Wiring Port: 3/4 inch n.p.t.
Warranty:
Instrument: 2 years non-prorated
Sensor: 2 years warranty
FCC Statement: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
Approval: Approved by CSA to both U.S. and Canadian standards:
Class I, Group B, C, D
Approved by CSA to both U.S. and Canadian standards:
Class II, Group E, F, G for toxic gas transmitter only
Approved to Combustible Performance Standards ISA-S12.13 and C22.2 No. 152
Two backlit liquid crystal displays (LCD)
Three field retro-fittable SPDT relays; 5 amps @ 250 Vac
Part 15 of the FCC Rules and ICES-003 Canadian EMI requirements. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.
22
Page 31
GasPoint
Specifications
Replacement Parts and Accessories
Transmitters c/w Sensor Assemblies and Relays
Model No. Description Qty
GP-WD Transmitter c/w combustible sensor 1
GP-IR-WD Transmitter c/w IR combustible sensor 1
GP-HD Transmitter c/w hydrogen sulfide
GP-MD Transmitter c/w carbon monoxide
GP-SD Transmitter c/w sulfur dioxide sensor 1
GP-ZD Transmitter c/w hydrogen cyanide
GP-XD Transmitter c/w oxygen sensor 1
GP-AD Transmitter c/w ammonia sensor 1
GP-DD Transmitter c/w nitrogen dioxide
GP-CD Transmitter c/w chlorine sensor 1
GP-VD* Transmitter c/w chlorine dioxide
GP-YD* Transmitter c/w hydrogen sensor 1
GP-LD* Transmitter c/w hydrogen chloride
Add Suffix "-SS" for optional stainless steel transmitter enclosure
*Contact BW Technologies for sensor availability.
,ClO2 and HCl sensors are only certified for ordinary locations.
Cl
2
Sensor Assembly enclosures are stainless steel (standard)
Accessories and Spares
Model No. Description Qty
D2DT Duck mounting kit
GP-DUC-K1 Duct mount adapter
GP-1 Gas transmitter only c/w LCDs
GP-SEP Sensor separation kit
GP-MBUS3 MODBUS communication
GP-MBUS4 MODBUS communication
IR-RW03 IR combustible sensor
SS-RA02 Ammonia sensor assembly
SS-RC02 Chlorine sensor assembly
SS-RD02 Nitrogen dioxide sensor
SS-RH02 Hydrogen sulfide sensor
SS-RL02 Hydrogen chrloride sensor
SS-RM02 Carbon monoxide sensor
SS-RS02 Sulfur dioxide sensor assembly
sensor
sensor
sensor
sensor
sensor
sensor
and relays (no sensor)
expansion module
expansion module
assembly
assembly
assembly
assembly
assembly
Model No. Description Qty
SS-RW02 Combustible sensor assembly
SS-RX02 Oxygen sensor assembly
SS-RZ02 Hydrogen cyanide sensor
assembly
1
1
E0036 Calibration plug
GP-CAL-3 Non-conductive remote
1
1
1
1
1
calibration cup and splash
guard
1
GP-SSPLASH4 Stainless Steel splash guard
GP-SSCAL4 Stainless steel remote
1
1
calibration cup and splash
guard
1
GPOINT-B GasPoint pushbutton protective
1
boot
1
1
GP-FP-MPCB1 PCB – main control board with
LCDs and internal faceplate
GP-MPCB1 PCB - main control board with
LCD
GP-PPCB1 PCB – power board with relays
GP-HART Hart communication expansion
module (2-wire system)
GP-2210 Internal faceplate with hinge
and label
M1147 Enclosure with glass window
1
1
1
GP-POWER1 Power supply 110/220 Vac – 24
Vdc
GP-SSPB Stainless steel process baffle
GP-SSPB-2 Stainless steel process baffle
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D1374 User manual
with NPT fitting
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Page 32
GasPoint
User Manual
24
Page 33
GasPoint
Specifications
25
Page 34
GasPoint
User Manual
26
Page 35
D1374/5 (English)
iERP: 122635
© 2006 BW Technologies, all rights reserved. Printed in Canada.
All product names are trademarks of their respective companies.
Page 36
Corporate Headquarters
Calgary, Alberta
Calibration Flow Rates
The following information has changed in the user manual.
D1374/4 Page 26
D1374/5 Page 20
Operating and Calibration Specifications
Hydrogen
Specifications
Calibration
Flow rate (min). ml/minute
at a % or ppm reading of:
1: It is recommended that the calibration
gas concentration for toxic sensors be
50% of the selected mesuring range.
(Factory default values are shown).
Auto span. Values expected by the
transmitter for toxic gases can be changed
at any time. Refer to Changing the Alarm
Setpoints and Calibration Gas Setpoints in
the user manual.
2: For oxygen use pure air calibration gas.
1
:
sulfide
H2S ppm
250–500
20 ppm
Carbon
monoxide
CO ppm
250–500
200 ppm
Sulfur
dioxide
SO2 ppm
250–500
20 ppm
Note:
Ammonia
NH3 ppm
500–1000
50 ppm
Performance data is based on conditions at 20°C, 50%
RH, 1013 mBar.
Do not adjust the oxygen sensor span value.
Hydrogen
cyanide
HCN ppm
250–500
15 ppm
Nitrogen
dioxide
NO2 ppm
500–1000
10 ppm
Oxygen
O2 % v/v
250–500
20.9%
123179
GasPoint
2
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