Honeywell M20 Sensepoint PPM Combustible Sensor Instruction Manual

Honeywell M20 Sensepoint PPM Combustible Sensor Instruction Manual

Operating Instructions

SAFETY

WARNINGS

• This apparatus is not suitable for use in oxygen enriched atmospheres (>21%v/v). Oxygen deficient atmospheres (<10%v/v) may suppress sensor output.
• Refer to local or national regulations relative to installation at the site.
• Operators should be fully aware of the action to be taken if the gas concentration exceeds an alarm level.
• Installation should consider not only the best placing for gas leakage related to potential leak points, gas characteristics and ventilation, but also where the potential of mechanical damage is minimized or avoided.
• Electrostatic risk – Do not rub or clean with solvents. Clean with a damp cloth. High velocity airflows and dusty environments can cause hazardous electrostatic charges.

CAUTIONS

• Atmospheres above 100% LEL may suppress the sensor reading.
• Do not modify or alter the sensor construction as essential safety requirements may be invalidated.
• Install using certified Ex e or Ex d junction box, connectors and glanding.
• Dispose of in accordance with local disposal regulations. Materials used –Fortron ® (PPSPolyphenylene Sulphide)
• This equipment is designed and constructed as to prevent ignition sources arising, even in the event of frequent disturbances or equipment operating faults.
  NOTE: The control card must have a suitably rated fuse.

INTRODUCTION & 2. ASSOCIATED DOCUMENTATION

ATEX SPECIAL CONDITIONS FOR SAFE USE
The detector must be protected from impact.
The integral supply cables must be protected from impact and terminated in a suitable terminal facility.
The detector is considered to present a potential electostatic risk and must not be located in high air flows or rubbed.

INSTALLATION

1. INTRODUCTION
   Sensepoint is a sealed disposable sensor for the detection of flammable gases and is designed for use with an approved junction box.
   It employs a catalytic pellistor sensor device which is used as part of a bridge measuring circuit.
   Sensepoint is certified for hazardous areas to EN60079 and is protected against water and dust ingress to IP67. The installation must be consistent with the certification approval.
   The sensor is available in M20 or 3/4 NPT thread versions.
   The sensors can be fitted with accessories such as Weather Protection, Flow Housings (for use when calibrating the sensor and in sampling systems), and a Collecting Cone for the detection of gases which are lighter than air.

2. ASSOCIATED DOCUMENTATION
   2106M0502 Sensepoint Technical Handbook Refer to the relevant control system manual for connection information.

3. INSTALLATION
   Installation and service must be performed by a qualified installation engineer with the power to the sensor disconnected.
   The Sensepoint must be fitted into a suitably approved Ex e or Ex d junction box fitted with a suitably approved cable gland. This should be correctly installed before use.
   The sensor should be installed in a location free from direct heat sources. For optimum protection against water ingress ensure that the sensor is installed facing downwards.
   See the Sensepoint Gas Sensors Technical Handbook for installation in a duct or in forced air conditions.
   Remove the sensor’s protective disc before use by
   unscrewing the filter housing, removing the filter and then the disc. Discard the protective disc. Refit the filter into the filter housing and replace the filter housing on the sensor.
   The field connections should be three-core multi-strand cable with a maximum conductor size of 2.5mm2 (14AWG).
   A screened cable is necessary.
   The sensor should be fitted into a threaded hole within thejunction box and locked in place with a lock nut. Ensure that junction box thread is compatible with sensor thread.
   Connect the field and Sensepoint wiring to the junction box connector block as shown in the following diagram. The unit requires 200mA current with a nominal 3V supply.
   INSTALLATION & 4. CALIBRATION
   
   Wiring connections are:-
   Following installation the sensor must be calibrated.

4. SENSOR CALIBRATION
   Caution: Calibration procedures should only be carried out by qualified personnel.
   Note: Sensors should be calibrated at concentrations representative of those to be measured. It is always recommended that the Sensepoint sensor is calibrated with the target gas it is to detect. If this is not possible, cross calibration should be performed.
   Since combustible sensors require oxygen for correct operation, a mixture of gas in air should be used for calibration purposes.
   CALIBRATION

5. CALIBRATION PROCEDURE
   The calibration adjustments are carried out at the control card and gassing is performed at the sensor.

6. Apply power and allow the sensor to warm up for 20 minutes.

7. First ensure there is no gas present on the sensor. If combustible gas is suspected to be in the vicinity of the Sensepoint sensor, fit a Flow Housing accessory and flow clean air over the sensor.

8. Set the zero reading on the control system.

9. Remove the filter housing or accessory and replace it with a Flow Housing accessory, if not already fitted.

10. Connect the Flow Housing input to a regulated cylinder, containing a known concentration of target gas at approximately the sensor alarm point (e.g. 50% FSD gas in air), using nylon or PTFE tubing.
    Caution: As some test gases may be hazardous, the
    Flow Housing outlet should exhaust to a safe area. (6) Pass the gas through the Flow Housing at a flow rate of approximately 1 to 1.5 litres per minute. Allow the sensor two to three minutes to stabilise.

11. Adjust the control card to indicate the concentration of the target gas being applied.
    Note: It is useful to record the mV output of the sensor, via the control card, throughout the life of the sensor to ensure that there are no poisoning effects that will reduce the sensor performance. This would be indicated by a reduction in the mV output for the same gas concentration. It is recommended that the sensor is replaced when 60% loss has occurred.
    For calibration using the Weather Protection in high flow applications refer to the technical handbook.

12. CROSS CALIBRATION PROCEDURE
    When the Sensepoint sensor is to be calibrated with a gas which is different from the gas/vapour to be detected, the following cross calibration procedure should be followed:
    Table 1 lists gases according to the reaction they produce. (These are not applicable at %LEL levels). Other calibration information may be obtained from Honeywell Analytics or the Technical Handbook.
    Table 1: Cross Sensitivities (measured at 20°C STP)Applied gas or vapour| Relative sensitivity| Applied gas or vapour| Relative sensitivity
    ---|---|---|---
    Acetone| 120| Hydrogen| 113
    Ammonia| 55| MIBK| 181
    Butane| 164| Octane| 197
    Butanone (MEK)| 140| Propane| 153
    Cyclohexane| 193| Tetrahydrofuran| 136
    Diethyl ether| 140| Toluene| 181
    Ethane| 133| Triethylamine| 142
    Ethylene| 181| Xylene| 173
    Heptane| 200| Methane| 100
    Hexane| 193| |

• relative to Methane = 100
  CROSS CALIBRATION
  Calibration formula:
  The PPM scale reading to be set is calculated using the formula:
  S = C x Y
  Z
  S = Scale reading to be set (ppm).
  C = Concentration of calibration gas (ppm).
  Y = Relative sensitivity to methane of calibration gas.
  Z = Relative sensitivity to methane of gas to be detected.
  Cross Calibration example:

  * Target gas to be detected is xylene in the range 0-3000 ppm.
  *       * Calibration gas available is ethane, concentration 2000 ppm.  

  Applying the calibration formula:
  S = 2000ppm x 133 = 266000 = 1538ppm 173
  173                       173
  The control card scale (meter) should be set to 1500 ppm to give an accurate reading for xylene using 2000 ppm ethane as a calibration gas.
  IMPORTANT
  Where the user calibrates any sensor using a different gas, responsibility for identifying and recording calibration rests with the user. Refer to local regulations where appropriate.
  Table 2: Recommended full scale deflection (fsd)Gas or Vapour| fsd| Gas or Vapour| fsd
  ---|---|---|---
  Acetone| 5000 ppm| Hydrogen| 5000 ppm
  Ammonia| 15000 ppm| MIBK| 3000 ppm
  Butane| 5000 ppm| Octane| 3000 ppm
  Butanone (MEK)| 5000 ppm| Propane| 5000 ppm
  Cyclohexane| 3000 ppm| Tetrahydrofuran| 5000 ppm
  Diethyl ether| 5000 ppm| Toluene| 3000 ppm
  Ethane| 5000 ppm| Triethylamine| 5000 ppm
  Ethylene| 3000 ppm| Xylene| 3000 ppm
  Heptane| 3000 ppm| Methane| 7000 ppm
  Hexane| 3000 ppm| |

  5. FAULT FINDING
  6. FAULT FINDING
     Caution: There are no user serviceable parts within the Sensepoint and attempted changes may invalidate the certification requirements.
     Sensor reads non zero all the the time:

  * gas could be present, ensure that there is no combustible gas in the atmosphere.  

  Sensor reads non zero when no gas is present:

  * adjust the zero of the control system.  

  Sensor reads low when gas is applied:

  * adjust the span of the control system.  

  Sensor reads high when gas is applied:

  * adjust the span of the control system.  

  Sensor reads zero when gas is applied:

  * check the wiring.
  * check that the dust protection cap has been removed.
  * check that the sinter is not obstructed.
  * replace the sensor if poisoning is suspected.

  6. MAINTENANCE
  7. CHANGING FILTERS

  * Remove the black plastic retainer or accessory.
  * Remove the old filter and replace it with a fresh filter.
  * Replace the black plastic retainer or accessory  

  

APPENDIX A – SPECIFICATIONS

Operating temperature range:
-30°C to +65°C standard.
Operating humidity range:
20% to 90% RH continuous.
10% to 99% RH intermittent – non condensing.
Operating pressure range:
90 to 110 k Pa.
Warm up time:
20 minutes.
Voltage range:
2.9 V to 3.5 V bridge (at 200mA).
Power consumption:
700mW.
Signal output:
mV bridge.
Calibration flow rate:
recommended between 1 and 1.5 l/min.
Poisoning:
the sensing elements may become inactive after extensive exposure to silicones, halogenated hydrocarbons, heavy metals or sulphur compounds.
Expected operating life:
5 years.
IP rating:
IP65 standard.
IP67 with weather protection.

APPENDIX B – MAIN FEATURES

SPARE PARTS & CERTIFICATION

Sensor …………………………………………………. 2106B1205 (M20)
Sensor ……………………………………………. 2106B1209 (3/4 NPT)
Weather protection………………………………………. 02000-A-1640
Sensor filter………………………………………………… 00780-F-0018
Flow housing………………………………………………. 02000-A-1645
Collecting cone …………………………………………… 02000-A-1642
Junction box (std)………………………………………… 00780-A-0100
To reorder a complete new sensor, see the label on the product leads, or contact Honeywell Analytics Ltd.

CERTIFICATION LABEL

Honeywell Analytics Ltd Poole BH17 ORZ UK MADE IN UK

Sensepoint Combustible
Ex d IIC 16 Gb, Ex tb IIIC
T4/T135°C (-40°C TO +80°C)

Baseefa08A TEX0265X II 2 GD IECEX BAS08.0068 X
T85°C Db (-40°C TO +55°C) T5/T100°C (-40°C TO +70°C)
IP67 WARNING-STATIC RISK-READ MANUAL Vmax=35Vac/dc Pmax=2W
Find out more
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gasdetection@honeywell.com
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Please Note:
While every effort has been made to ensure accuracy in this publication, no responsibility can be accepted for errors or omissions. Data may change, as well as legislation, and you are strongly advised to obtain copies of the most recently issued regulations, standards, and guidelines. This publication is not intended to form the basis of a contract.
Issue 11 10/2023
2106M0513 ECN-00042171
© 2023 Honeywell Analytics

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