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Teledyne 212R Instruction Manual

Thermal conductivity analyzer
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Thermal Conductivity Analyzer
Model 212R
I
M
NSTRUCTION
ANUAL
M
212R
ODEL
T
C
HERMAL
ONDUCTIVITY
A
NALYZER
DANGER
HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS MONITORING SYSTEM.
PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM.
P/N M73212
HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PERSIST FOR A
TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED.
11/29/07
ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND/OR SERVICING. BEFORE
ECO # 07-0182
CONDUCTING ANY MAINTENANCE OR SERVICING CONSULT WITH AUTHORIZED SUPERVISOR/MANAGER.
1
Teledyne Analytical Instruments

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  • Page 1 Thermal Conductivity Analyzer Model 212R NSTRUCTION ANUAL 212R ODEL HERMAL ONDUCTIVITY NALYZER DANGER HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS MONITORING SYSTEM. PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM. P/N M73212 HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PERSIST FOR A TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED.
  • Page 2 This warranty does not cover defects caused by wear, accident, misuse, neglect or repairs other than those performed by Teledyne or an authorized service center. We assume no liability for direct or indirect damages of any kind and the purchaser by the acceptance of the equipment will assume all liability for any damage which may result from its use or misuse.

  • Page 3: Table Of Contents

    Thermal Conductivity Analyzer Model 212R Table of Contents Introduction 1.1 Method of Analysis............5 1.2 Sensitivity ..............6 1.3 Stability ................ 6 1.4 Special Consideration ..........6 1.5 Physical Configuration ..........6 Installation 2.1 Location ............... 7 2.2 Electrical Requirements & Connections ...... 7 2.2.1 Primary Power ..........
  • Page 4 Thermal Conductivity Analyzer Model 212R 4.3 Standardization ............16 Periodic Maintenance 5.1 Heater Fan ..............17 Troubleshooting 6.1 Preliminary ..............17 6.1.1 Electrical Checks ........... 17 6.1.2 Sampling System Checks ......18 6.1.3 Summary of Preliminary Checks ....18 6.2 Loss of Zero Control............. 18 6.2.1 Dynamic Balance Procedure ......

  • Page 5: Introduction

    INTRODUCTION Method of Analysis. The Model 212R compares the thermal conductivity of a sample gas to that of a fixed composition reference gas and produces an electrical output signal that is calibrated to represent the difference between the two gases.

  • Page 6: Sensitivity

    H2. Each has its own Thermal Conductivity Value. These differ by about 10% from one another. So this must be taken into consideration when attempting to use the 212R on H2 streams. We would recommend one consult Wikipedia.com or other sources to learn more about these two states of H2 and how the thermal conductivity of the gas stream varies with the state.

  • Page 7: Installation

    4. Temperatures other than that one would expect to see in airconditioned, temperature controlled office of lab enviroment. The 212R should not be mounted outdoors or subject temperature fluc- tuations beyond 2 or 3 degrees. The analyzer should be placed as close as possible, subject to the afore- mentioned conditions, to the sample point.

  • Page 8: Primary Power

    Thermal Conductivity Analyzer Model 212R IMPORTANT: The foam lining the interior of the analyzer is an integral part of the environmental temperature control system. Removal or destruction of this lining will result in erratic instrument perfor- mance. 2.2.1 Primary Power.

  • Page 9: Completion & Inspection

    Thermal Conductivity Analyzer Model 212R Run the cable attached to the transformer unit in through the access hole that is equipped with the cable clamp and terminate it as specified on the interconnection diagram. 2.2.4. Completion and Inspection. After the electrical connections have been completed, slide any excess slack back into the conduits so that the installed wiring is not in contact with the components mounted on the analyzer chassis.

  • Page 10: Reference Gas

    Thermal Conductivity Analyzer Model 212R cause a large fluctuation in output signal. For best results, use electropolished SS tubing Note #4: Because of the diffusion of air through composition materials, only dual stage SS regulators with metallic diaphragms should be used in conjunction with the sample and supporting gas supplies.

  • Page 11: Installation Of Cylinder Supplies

    Thermal Conductivity Analyzer Model 212R 2.3.4 Installation of Cylinder Supplies. The reference and standard gas cylinders should be installed as close to the analyzer as possible. Each cylinder should be provided with a dual stage, metallic diaphragm, pressure reducing regulator. When installing the regulators, crack the cylinder valve open so that gas is flowing.

  • Page 12: Vent Lines

    Thermal Conductivity Analyzer Model 212R 2.3.7 Vent Lines. The sample path, reference path, and an integral bypass system vent from separate ports at the rear of the analyzer. Wherever possible, TAI recommends that the gases be permitted to vent directly to the atmosphere. If it is necessary...

  • Page 13: Reference Gas Flow

    Thermal Conductivity Analyzer Model 212R 4. Determine what the sample pressure is and set the output pressure of the cylinder gas supplies to agree with the sample pressure. This procedure, although not absolutely necessary, will minimize flow adjustments when the sample path is switched to the various inputs.

  • Page 14: Span Standardization

    Thermal Conductivity Analyzer Model 212R After the analyzer stabilizes adjust the "ZERO" control until the recorder indicates the impurity concentration of the zero gas composition. Be sure that the range switch is on position #1 and that the sample path flowrate is 0.3 scfh.

  • Page 15: Sample Mode

    Thermal Conductivity Analyzer Model 212R virtually instantaneous. Recovery is a function of how long it takes to purge the sampling system upstream from the cell. Accelerating the sample path flowrate will speed the response. NOTE: TAI recommends that some bypass flow be permitted at all times.

  • Page 16: Supporting Gas Supplies

    Thermal Conductivity Analyzer Model 212R The reference and sample flowrates should be checked daily. The instru- ment is somewhat flow sensitive. Operating on Range #1 a change in flowrate of 0.1 scfh will cause a corresponding change in sensitivity of from 1 to 20% of scale.

  • Page 17: Periodic Maintenance

    Analysis by thermal conductivity is nonspecific in nature. A thermal con- ductivity analyzer with the fine range sensitivity of the Model 212R will respond to many influencing factors other than the component of interest; particularly when operated at Range #1 sensitivity.

  • Page 18: Sampling System Checks

    Thermal Conductivity Analyzer Model 212R Check to see that both the analyzer and recorder are being furnished electrical power. Check to see that the analyzer and recorder fuses are intact. Check all electrical connections outside of the analyzer. 6.1.2 Sampling System Checks.

  • Page 19: Dynamic Balance Procedure

    Thermal Conductivity Analyzer Model 212R 6.2.1 Dynamic Balance Procedure. The measuring bridge circuit (see schematic) incorporates two 10 turn potentiometers that are utilized to compensate for minute differences in the resistive and reactive properties of the hot wire elements and the center tapped secondary of the bridge transformer in the reference and zero gas related to the application.

  • Page 20: Correct Operation

    Thermal Conductivity Analyzer Model 212R 5) Using a screwdriver that has a shaft diameter of 1/8” and a shaft length of at least 6”, turn the “Reactive” balance adjustment all the way counterclockwise (CCW) until the potentiometer stop point is reached. Turn the adjustment back clockwise (CW) 5 full turns to center the adjustment.

  • Page 21: Incorrect Operation

    Thermal Conductivity Analyzer Model 212R or incorrect instrument installation. The following conditions can produce an erratic output from the analyzer: 1) Installation in an area that is subject to large changes in ambient temperature, direct sunlight, drafts from wind, blowers, or air condi- tioners.

  • Page 22: Temperature Control Check

    Thermal Conductivity Analyzer Model 212R Check as previously stated, the analyzers entire sampling system has been checked under pressure with a leak detector. However, if the external system checks out and the instrument is displaying a large diurnal or uni- directional drift, the interior sampling system should be checked for leaks.
  • Page 23 Thermal Conductivity Analyzer Model 212R tom must be evident with zero gas flowing. If this symptom is displayed only when the sample is flowing, the problem is related to one (or more) of the five (5) points outlined in section 7.3.

  • Page 24: Calibration Data

    Such action indicates a properly functioning heater circuit. If the meter stays in the 47 volt region, the circuit card will have to be replaced. CALIBRATION DATA FOR MODEL 212R SERIAL NUMBER: 195929 Ranges. The ranges of the analyzer are:...

  • Page 25: Output Signal

    Thermal Conductivity Analyzer Model 212R Output Signal: Output coincides with 100% analysis. 0 ppm in H 20mA 50,000 ppm - Range #1 in H 5000 ppm - Range #2 in H 500 ppm - Range #3 in H Span Setting: 555 Recommended Accessory Gases.

  • Page 26: Span Gas

    Thermal Conductivity Analyzer Model 212R 7.4.3 Span Gas. Containing an equivalent impurity. Again, the span gas must be procured from a supplier who will certify its composition. The range switch must be in range 3 when the span gas is introduced.

  • Page 27: Drawing List

    Orders should be sent to: TELEDYNE Analytical Instruments 16830 Chestnut Street City of Industry, CA 91749-1580 Phone (626) 934-1500, Fax (626) 961-2538 TWX (910) 584-1887 TDYANYL COID Web: www.teledyne-ai.com or your local representative. Drawing List B-73356 Outline Diagram D-73212 Final Assembly A-72035...

  • Page 28: Specifications

    Thermal Conductivity Analyzer Model 212R APPENDIX Specifications: Ranges: Three decade ranges: Minimum Full scale(ppm) 20 ppm Hydrogen balance Argon 25 ppm Hydrogen balance Nitrogen, Air 100 ppm Nitrogen balance Argon, Helium 100 ppm Helium balance Air 150 ppm Nitrogen, Carbon Monoxide balance Hydrogen...

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