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Bascom_turner OM-1108 Operation Manual

Natural gas, carbon monoxide, oxygen, and hydrogen sulfide detectors
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BASCOM-TURNER
INSTRUMENTS
GAS-RANGER™ ™ ™ ™ DETECTORS
OPERATION MANUAL
NATURAL GAS, CARBON MONOXIDE, OXYGEN,
AND HYDROGEN SULFIDE DETECTORS
Part Number OM-1108

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  • Page 1 BASCOM-TURNER INSTRUMENTS GAS-RANGER™ ™ ™ ™ DETECTORS OPERATION MANUAL NATURAL GAS, CARBON MONOXIDE, OXYGEN, AND HYDROGEN SULFIDE DETECTORS Part Number OM-1108...
  • Page 3 LIMITED WARRANTY Bascom-Turner Instruments warrants Gas-Ranger Detectors to be free from defects in materials and workmanship for one year following the date of shipment. This limited warranty applies to the original purchaser of the Detector and is not transferable except by Bascom-Turner's authorized Distributors.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS SPECIFICATIONS FEATURES PART 1. OPERATION The Gas-Ranger Detectors ..................Operation ......................... Instrument Checks....................Interference from Other Gases, Liquids, or RFI ............. Change of Batteries ....................Troubleshooting ...................... Probes ........................Routine Maintenance ....................PART 2. CALIBRATION AND ALARM LEVEL SELECTION Automatic Calibration with A-CAL ..............
  • Page 6 FEATURES The Gas-Ranger™ portable methane, and combined methane, carbon monoxide, hydrogen sulfide and oxygen detectors are intrinsically safe, microprocessor based instruments designed to test ambient air and flue gas over a wide temperature range. These detectors have many features for easy and reliable operation: •...
  • Page 7 (1,2) SPECIFICATIONS Gases Natural Gas (Methane) Warm-Up Time 30 seconds Detected Carbon Monoxide (CO) Oxygen (O Operating Temperature C to 50 Hydrogen Sulfide (H (with fresh batteries) (-20 F to 120 Sensors Catalytic Combustion (CH Maximum Temperature C (620 Thermal Conductivity (CH of Sampled Gas Electrochemical (CO) Electrochemical (O...

  • Page 9: Part 1. Operation

    PART 1. OPERATION THE GAS-RANGER DETECTORS This manual describes the operation of the family of Gas-Ranger detectors for natural gas, carbon monoxide and oxygen: Model RGI -201 - Detects natural gas and displays it as % LEL or % GAS Model RGI -211 - Detects natural gas and displays it as % GAS Model RGC-301 -...

  • Page 10: Operation

    OPERATION A. Overview of Essential Operating Practice Gas-Ranger detectors are easy to use. Once the appropriate display is selected, operation is automatic. However, a few general rules must be followed to insure reliability and accuracy. Pump. Gas-Ranger detectors have a built-in pump and depend on this pump for their operation.
  • Page 11 automatic calibration, it pays to calibrate as frequently as possible, and certainly, no less than monthly. Accuracy. A properly operating and calibrated detector will respond with the specified accuracy. If combustible gases other than the gas used for calibration are likely or suspected, the instrument cannot be relied upon to give a proper indication of their concentration and hence of how close to their combustible limits they may be.
  • Page 12 If a check is to be made for trace amounts of gas in a bar hole or above ground, for example around the foundation of a structure, the % GAS or % LEL display should be used. The bar holing feature using the RESET switch is appropriate for pinpointing underground leaks. To Use the % LEL Scale.
  • Page 13 TRACK GAS. The survey can now be done by observing the readings on the display while the beeper is silent. Notes: • Both background zero suppression and silencing of the beeper are only applicable as long as the selector switch remains in the TRACK GAS position.
  • Page 14 To Display Oxygen with the "% Oxygen" Display (Models RGO-321, RGA-411/412, RGA-611/612). Connect an appropriate probe to the dust and water-block filter and set the selector switch to "% Oxygen". After warm-up, the display shows the ambient concentration of oxygen in percent by volume. If ordinary air is being sampled, the display should read 20.9 ±0.2. If it does not, switch to "AUTO ZERO", wait until the display shows "End", and return the switch to the "% Oxygen"...
  • Page 15 Hydrogen Sulfide Detection - Models RGC-301/311 and RGA-411/412 The electrochemical cell used to detect CO also responds quantitatively to hydrogen sulfide (H S). The response to 1 ppm H S is registered as 4 on the PPM CO display. This ratio holds for all values of H S up to about 100 ppm H S.

  • Page 16: Instrument Checks

    INSTRUMENT CHECKS Automatic Battery Check If the battery life is less than about 1 hour, the display flashes "Lo" (low) between readings. The batteries should be changed at a convenient time. If the battery life is over, the display stays on "Lo". The batteries must be changed to make the instrument operational. Automatic Pump Check If the intake is blocked, the display shows "bloc"...

  • Page 17: Interference From Other Gases, Liquids, Or Rfi

    INTERFERENCE FROM OTHER GASES, LIQUIDS, OR RFI The methane detectors use two sensors: A catalytic combustion filament calibrated with methane. It is used up to about the lower flammable limit (5.0% by volume) of methane. A thermal conductivity sensor calibrated with methane. It is used from the lower flammable limit (5.0 vol %) to 100 vol % of methane.

  • Page 18: Change Of Batteries

    CHANGE OF BATTERIES Gas-Ranger detectors are powered by two (2) alkaline (non-rechargeable) D-size batteries (1.5V, Type AM-3) or by two rechargeable batteries sold by Bascom-Turner. The batteries are good for at least eight, and typically twelve, hours of continuous operation. When the batteries are drained to about one hour of remaining continuous use, the display flashes "Lo"...

  • Page 19: Troubleshooting

    TROUBLESHOOTING Coarse Zero Procedure: If the display shows "nogo" in clean air during auto zero, press and hold the RESET switch on the front panel while turning the selector switch from AUTO ZERO to some other scale and back to AUTO ZERO again. Please note that you must carry out this procedure starting with the "nogo"...

  • Page 20: Probes

    PROBES Standard Probe The standard probe (Part No. SP-306), a rigid tube, connects to the dust and water-block filter. If extra length is desired, an extension (7", SP-308) is screwed finger-tight onto the end of the probe. A rubber gas collector (Part No. RT-107) is useful for finding leaks under windy conditions.

  • Page 21: Routine Maintenance

    ROUTINE MAINTENANCE Dust and Water-block Filter A filter, housed in a knurled nut, removes particles of dust and dirt and blocks water. The white disk in the filter should be inspected periodically for accumulated dirt which may slow air sampling. A filter can be cleaned by removing the probe and tapping the filter cartridge on a hard surface to remove dry dust and dirt.
  • Page 22 Dust-Stopper The dust-stopper is a filter with a large surface area on which dust can collect without slowing the sampling rate of the Gas-Ranger. The filter element is easily cleaned or replaced by removing the threaded cap and either blowing off the filter element or pulling it off and replacing.

  • Page 23: Part 2. Calibration And Alarm Level Selection

    PART 2. CALIBRATION AND ALARM LEVEL SELECTION AUTOMATIC CALIBRATION WITH A-CAL™ ™ ™ ™ The A-CAL firmware calibrates instruments automatically using calibration gas available from Bascom-Turner Calibration Gas. The gas required for automatic calibration of the catalytic combustion and CO sensors is Bascom-Turner's methane and CO calibration gas (Part No. MC-620) containing 2.5 ±...
  • Page 24 After calibration, the monitor will show "CAL" and the instrument will beep briefly. Remove the probe from the gas outlet. The instrument is ready for use. Note: During calibration, the selector switch remains in the AUTO ZERO position. After calibration is complete and "CAL" is displayed, the selector switch must be placed at some other scale (or the OFF position) to return the monitor to a normal operating mode.
  • Page 25 Error Codes during Automatic Calibration. The only special error code that may appear during automatic calibration is "nogo" (no go). This code, which denotes that automatic calibration cannot proceed, may appear in the following circumstances: More than 30 seconds elapse between the "go" display and the introduction of calibration gas.

  • Page 26: Alarm Level Selection

    ALARM LEVEL SELECTION To review or change alarm limits, remove the pan head #4-40 black screw (see Figure 3) from the right side of the instrument (as you face it) using a Phillips screwdriver and access a push-button switch with a short rod 3/32" (or less) in diameter. Set the front panel selector switch to AUTO ZERO and after "Air"...
  • Page 27 Table 1. Display Sequence Display Statement Use/Comments bEEP followed by ON The TRACK GAS beeper is active. Used only for turning beeper ON or OFF. The alarm or by OFF The TRACK GAS beeper is silent. limit is set by SniF display (see below). SniF followed by a number The TRACK GAS alarm is at value shown.
  • Page 28 To Change Alarm Levels. If an alarm level is to be changed, rather than turned OFF, select the relevant display by pressing the push-button an appropriate number of times, then press RESET until ON appears, then press the push-button. The display will show a number (the previous alarm level) with a flashing first digit.
  • Page 29 To Change the Alarm Level for the CO Display to 35 PPM CO. Set the front panel switch to AUTO ZERO and press the push-button seven times. The display will advance to CO followed by a number (the current alarm level). Continue by Press Display Comment...

  • Page 30: Manual Calibration, Sensor Replacement, Pump Adjustment

    MANUAL CALIBRATION, SENSOR REPLACEMENT, PUMP ADJUSTMENT Manual calibration is required if a sensor has drifted too far to be calibrated automatically and sometimes when a sensor is replaced. Since the procedures described below access basic operating parameters, safeguards have been built to ensure that the set-up mode is not entered accidentally.
  • Page 31 Table 2. Display Sequence in Set-Up Mode Display* Parameter Use/Comments followed by a number Pump current in arbitrary units Used to adjust block limit for pump (see Section 11E) followed by a number Battery voltage Should be between 2.15 and 3.15 (Do NOT Adjust) followed by a number Room temperature ( For installing a new sensor (set automatically by SCAL)
  • Page 32 SENSOR REPLACEMENT Sensor replacement must be followed by new sensor calibration as described in Part C of this Section. The tools required for sensor replacement and new sensor calibration are a Phillips #1 screwdriver and a small rod (less than 3/32" in dia.) to actuate the push-button under the 4-40 black screw on the right side of the detector (see Figure 3).
  • Page 33 After "End" appears on the display and the instrument beeps, calibrate without moving the selector switch from the TRACK GAS position. Insert the tip of the standard probe partially into the outlet port of the gas dispenser or, if a manual calibration apparatus (for example, Part No.
  • Page 34 D. BOOSTING SENSOR SENSITIVITY The sensitivity of a natural gas sensor generally decreases with use because some substances, for example, silicones, tend to poison the catalyst. A catalytic sensor can often be restored to its original sensitivity by periodically cleaning it with Boost Gas available from Bascom-Turner.
  • Page 35 After calibration, the detector will show "CAL" and the instrument will beep briefly. Remove the probe from the gas outlet. Replace the black #4-40 screw and the instrument is ready for use. Note: During calibration, the selector switch remains in the TRACK GAS position. After calibration is complete and "CAL"...

  • Page 37: Appendix I Set Up And Purge Of The Calibration Gas Dispenser

    APPENDIX I SET UP AND PURGE OF THE CALIBRATION GAS DISPENSER Calibration Gas. The gas required for automatic calibration of the catalytic combustion and CO sensors is Bascom-Turner's methane calibration gas (Part No. MC-620) containing 2.5 ±0.05% methane and 100 ppm ±2 ppm CO in air. It is provided in a disposable aluminum tank containing 620 liters of gas, sufficient for at least 300 calibrations.
  • Page 38 Secure gas cylinder to a wall, bench or stand with a mounting bracket so it will not tip over or fall. Observe the inlet supply pressure gauge, which will verify cylinder pressure. PURGING THE GAS DISPENSER: Purging air from the gas dispenser should be done each time a new tank of calibration gas is installed and prior to instrument calibration.

  • Page 39: Appendix Ii Set Up Of The Manual Calibration Apparatus

    APPENDIX II SET UP OF THE MANUAL CALIBRATION APPARATUS These instructions should be followed when setting up and using the manual calibration apparatus (Part No. PCA-302). The components of the manual calibration apparatus are shown assembled in Figure 5, they include: Description Part Number Methane &...
  • Page 40 REGULATOR AND HOSE INSTALLATION Secure gas cylinder to a wall, bench or stand with a mounting bracket so it will not tip over or fall. Be sure both the regulator and cylinder have compatible CGA fittings. Do not attempt to use an adapter to connect incompatible CGA fittings. Inspect cylinder's and regulator's Standard Compressed Gas Association (CGA) connections for damage, dirt, dust, oil, or grease.

  • Page 41: Accessories And Spare Parts

    ACCESSORIES AND SPARE PARTS Description Part Number Probes and Hoses Gas-Ranger Probe & Rubber Tip ..................Gas-Ranger Probe Extension (7" long) ................Ceiling/Bar Hole Probe & Rubber Tip (34 inch long, clear) ..........Clear Bar Hole Probe (34 inch long, side holes) ..............Fiberglass Bar Hole Probe (36 inch long, side holes) ............

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