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T

HEORY

748221-L Rosemount Analytical December 2000

27

Model 7D Thermal Conductivity Analyzer

F

IGURE

5-1. T

HERMAL

C

ONDUCTIVITY

C

ELL

0.5

0.5

20

0.5

0.5

3

4

5

1

6

7

8

2

Reference Flow

Sample Flow

Front Panel Zero
Potentiometer

Resistor values are in ohms.

Bridge Power

Supply (+)

Bridge Power

Supply (-)

B. F

UNCTIONAL

D

IAGRAM OF

B

RIDGE

C

IRCUIT

Thermal Conductivity
Cell Block

Reference
Filaments

Reference *
Gas In

Sample Gas In

Sample Filaments

NOTE: Cell Block Sectioned
      Through Sample Side.
      Section Through
      Reference side is
      Similar.

O-Ring
Seals

Sample
Gas Out

* Reference Ports Capped if Cell
Uses Sealed-In, Non-Flowing Reference Gas.

A. S

ECTIONAL

V

IEW OF

T

HERMAL

C

ONDUCTIVITY

C

ELL

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Содержание 7D

Страница 1: ...Rosemount Analytical MODEL 7D THERMAL CONDUCTIVITY ANALYZER EXPLOSION PROOF INSTRUCTION MANUAL 748221 L ...

Страница 2: ...hermal Conductivity Analyzer Hardware and or software changes may have occurred since this printing Manual Part Number 748221 L December 2000 Printed in U S A Rosemount Analytical Inc 4125 East La Palma Avenue Anaheim California 92807 1802 Teflon is a registered trademark of E I duPont de Nemours and Co Inc SNOOP is a registered trademark of NUPRO Co ...

Страница 3: ...NTATION P4 COMPLIANCES P5 SECTION 1 INTRODUCTION 1 1 ANALYZER MODULE 1 1 1 1 Thermal Conductivity Cell 1 1 1 2 Electronic Circuitry 3 1 2 GAS SELECTOR PANEL 4 SECTION 2 INSTALLATION 2 1 FACILITY PREPARATION 5 2 1 1 Installation Drawings 5 2 1 2 Customer Electrical Connections 5 2 1 3 Flow Diagrams 5 2 1 4 Location and Mounting 5 2 2 UNPACKING 7 2 2 1 Gas Requirements General 7 2 2 2 Calibration Ga...

Страница 4: ...CTRICAL POWER CONNECTIONS 16 SECTION 3 INITIAL STARTUP 3 1 ANALYZER CONTROLS AND ADJUSTMENTS 19 3 2 GAS SELECTOR PANEL CONTROLS 19 3 3 STARTUP PROCEDURE 19 3 4 CALIBRATION 21 SECTION 4 OPERATION 4 1 ROUTINE OPERATION 23 4 2 RECOMMENDED CALIBRATION FREQUENCY 23 4 3 SHUTDOWN 23 SECTION 5 THEORY 5 1 THERMAL CONDUCTIVITY CELL AND ASSOCIATED BRIDGE ADJUSTMENTS 25 5 2 ELECTRONIC CIRCUITRY 26 5 2 1 Maste...

Страница 5: ...s 32 6 2 3 Bridge Voltage Adjustment 33 6 2 4 Case Temperature Controller 33 6 2 5 Dual Alarm Module Optional 34 6 3 SUPPRESSED ZERO ADJUSTMENT 34 SECTION 7 REPLACEMENT PARTS 7 1 CIRCUIT BOARD REPLACEMENT POLICY 37 7 2 REPLACEMENT PARTS 37 7 2 1 Selected Replacement Parts 37 7 2 2 Temperature Control Assembly 38 7 2 3 Alarm Option 38 7 2 4 Range Switch Kit 38 DATA SHEET GENERAL PRECAUTIONS FOR HAN...

Страница 6: ...6 Master Board 12 2 7 Alarm Adjustments 13 2 8 Typical Alarm Settings 15 2 9 Case Heater Temperature Control Board 17 5 1 Thermal Conductivity Cell 27 7 1 Analyzer Assembly Door and Pneumatic Components 39 7 2 Analyzer Assembly Electronic Components 40 7 3 Temperature Control Assembly 41 TABLES 1 1 Available Gas Selector Panels 4 2 1 Alarm Output Connections 14 5 1 Range Switch Connections 26 DRAW...

Страница 7: ...rsonal injury death or substantial property damage if the warning is ignored CAUTION is used to indicate the presence of a hazard which will or can cause minor personal injury or property damage if the warning is ignored NOTE is used to indicate installation operation or maintenance information which is important but not hazard related Do not operate without doors and covers secure Servicing requi...

Страница 8: ...e initial startup during routine maintenance and any time the integrity of the sample containment system is broken to ensure the system is in leak proof condition Leak check instructions are provided in Section 2 2 3 Internal leaks resulting from failure to observe these precautions could result in an explosion causing death personal injury or property damage Tampering or unauthorized substitution...

Страница 9: ... VOLTAGE STANDARD NON LINEARIZED Switch selectable 0 to 10 mV 0 to 100 mV 0 to 1V or 0 to 5V DC OUTPUT VOLTAGE OPTIONAL LINEARIZED Switch selectable 0 to 10 mV 0 to 100 mV 0 to 1V or 0 to 5V DC ISOLATED CURRENT OUTPUT OPTIONAL 4 to 20 mA maximum load 1500 ohms DUAL ALARMS OPTIONAL Relay contact rating 1 0 A 120V AC 5 0 A 120V DC resistive loads CELL MATERIALS STANDARD CELL 316 stainless steel bloc...

Страница 10: ...Unauthorized returns will be returned to the sender freight collect When returning any product or component that has been exposed to a toxic corrosive or other hazardous material or used in such a hazardous environment the user must attach an appropriate Material Safety Data Sheet M S D S or a written certification that the material has been decontaminated disinfected and or detoxified Return to R...

Страница 11: ...vity Analyzer COMPLIANCES The explosion proof Model 7D Thermal Conductivity Analyzer is approved by Factory Mutual Research Corp FMRC for installation in Class I Groups B C and D Division 1 hazardous locations as defined in the National Electrical Code NEC ANSI NFPA 70 APPROVED FM ...

Страница 12: ...PREFACE P6 December 2000 Rosemount Analytical 748221 L Model 7D Thermal Conductivity Analyzer NOTES ...

Страница 13: ...t panel switch Information specific to the individual instrument is provided in the data sheet inserted in the back of this instruction manual A Model 7D Analyzer consists of an analyzer module Section 1 1 and if ordered an accessory gas selector panel Section 1 2 1 1 ANALYZER MODULE The analyzer module is supplied in an explosion proof enclosure suitable for installation in hazardous locations cl...

Страница 14: ...eat dissipation rate for each filament depends on the thermal conductivity of the surrounding gas Initially with suitable downscale calibration gas flowing through the sample passage and also through the reference passage if of the flow through configuration the bridge is balanced Thereafter any change in the relative proportions of the components passing through the sample passage changes the the...

Страница 15: ... field selectable output of 4 to 20 mA for a current actuated recorder or other device is obtainable through use of an optional plug in circuit board A calibration curve can be used to convert meter or recorder readings into concentration values Typical calibration curves are supplied for standard ranges Calibration curves for special ranges are available as options To avoid use of a calibration c...

Страница 16: ...the gas selector panel is assembled with brass components For corrosive streams stainless steel is used FIGURE 1 3 TYPICAL GAS SELECTOR PANEL DESCRIPTION PART NUMBER Brass and Copper construction for use with sealed reference 113357 Stainless steel construction for use with sealed reference 113920 Brass and Copper construction for use with flowing reference 117195 Stainless steel construction for ...

Страница 17: ...gram Analyzer using sealed reference gas Figure 2 3 Analyzer using flowing reference gas Figure 2 4 2 1 4 LOCATION AND MOUNTING LOCATION Proper location for the analyzer depends on two basic considerations Accessibility to the sampling point Protection of the instrument Ideally the analyzer should be located as close to the sampling point as possible Short sample lines reduce time lag in readings ...

Страница 18: ...NDUCTIVITY CELL USING FLOWING REFERENCE GAS ZERO SPAN SAMPLE 10 25 260 8 25 210 Mounting Holes 4 NO 8 Flat Head Screw Sample In To Analyzer Zero Gas In Span Gas In DOWNSCALE CALIBRATION GAS SAMPLE UPSCALE CALIBRATION GAS REF REF SAMPLE Upscale Calibration Gas To Analyzer Ref Gas Inlet Downscale Calibration Gas Sample Gas 1 25 32 Ref Gas To Analyzer Sample Inlet 3 25 83 12 3 Mounting Holes 4 NO 8 F...

Страница 19: ...as consists of two components for example hydrogen in nitrogen In this example hydrogen is designated the measured component and nitrogen constitutes the background gas SUPPRESSED ZERO RANGES With any zero suppressed range the zero concentration point for the measured component lies offscale below the lower range limit A typical example is 80 to 100 hydrogen in nitrogen Here the appropriate upscal...

Страница 20: ...ied in the Data Sheet at the front of this manual Gas fittings on both modules are tagged as to use Fittings are 1 4 inch NPT for 1 4 inch 6 3 mm tubing For interconnection use 1 4 inch 6 3 mm copper or stainless steel tubing depending on whether the sample stream is corrosive CONNECTION OF GASES Refer to Figure 2 3 or 2 4 and drawing 654625 Connect sample calibration gas lines to fittings tagged ...

Страница 21: ... Valves Sample Gas Flowmeter To Reference Vent Downscale Calibration Gas Upscale Calibration Gas Sample Gas Reference Gas Flowmeter Model 7D Thermal Conductivity Analyzer To Sample Vent Thermal Conductivity Cell 117195 or 118210 Gas Selector Panel Downscale Calibration Gas Used as Needle Valves Sample Gas Flowmeter To Reference Vent A DIFFERENT REFERENCE GAS AND CALIBRATION GAS B REFERENCE GAS ALS...

Страница 22: ...zer refer to drawing 654642 via a number 22 or number 24 AWG two conductor shielded cable Route the cable through conduit to the analyzer and into the case through the appropriate opening shown in drawing 654625 OPTIONAL DUAL ALARMS 10 12 16 18 8 6 2 20 9 7 5 4 3 1 11 13 14 15 17 19 TB10 Heater TEMPERATURE CONTROL ASSEMBLY Fan DETECTOR ASSEMBLY DC POWER SUPPLIES Fuse TB6 1 2 3 L1 L2 GND AC POWER I...

Страница 23: ...R LEAD 2 Connect the cable to input terminals of the recorder ensure that polarity is correct 3 Ground shield on one end only 2 3 2 LINEARIZED VOLTAGE OUTPUT OPTIONAL 1 Verify that Voltage Output Linearizer Board PN 633756 is properly inserted in J102 2 On the Master Board Figure 2 6 a Verify that TB2 1 is jumpered to TB2 4 and TB2 2 is jumped to TB2 5 b Set S1 for desired voltage 5V 1V 1 V or 01 ...

Страница 24: ...R4 R9 R7R22 R26 R6 R8 J4 AC POWER HEATER POWER C2 F13 R12 R10 C4 R14 R11 R15 AR2 AR1 R27 R1 R5 C3 C1 R3 R2 C5 C6 R23 AR3 C7 R19R21 R18 R17 R20 J7 J2 1 1 1 RESISTOR SELECT RANGE SPAN METER 01V 1V 1V 5V DETAIL OF S1 S1 Used to select voltage output range 5V 1V 0 1V or 01V R4 AR1 gain adjust Permits adjustment of AR1 gain from X1 to X100 to establish the sensitivity desired for Range 1 This is the hi...

Страница 25: ... adjustment potentiometers Alarm 1 the Low Alarm and Alarm 2 the High Alarm on the front panel Figure 1 1 and Deadband on the alarm module see Figure 2 7 FIGURE 2 7 ALARM ADJUSTMENTS The power and input signals have been wired to the terminal strip into which the alarm module plugs The wiring to the contacts 18 or 20 AWG is routed through a conduit hole see Drawing 654625 The alarm relay is in ene...

Страница 26: ...ELAY The ALARM 1 relay coil is de energized when the meter needle moves downscale through the value that corresponds to setpoint minus deadband This relay coil is energized when the needle moves upscale through the value that corresponds to setpoint plus deadband see Figure 2 8 ALARM 2 RELAY The ALARM 2 relay coil is de energized when the meter needle moves upscale through the value that correspon...

Страница 27: ... continuity between the common and normally closed contacts of the relay A Typical ALARM 1 Setting LOW DEADBAND SET FOR 20 OF FULLSCALE DEADBAND SET FOR 10 OF FULLSCALE B Typical ALARM 2 Setting HIGH INPUT SIGNAL Percent of Fullscale INPUT SIGNAL Percent of Fullscale 40 30 20 55 50 45 2 3 5 LINEARIZED VOLTAGE TWO RANGES OPTIONAL 1 Verify that the Voltage Output Linearizer Board PN 633756 is proper...

Страница 28: ... TB4 2 Note Take the usual precautions to avoid AC pickup DO NOT GROUND EITHER LEAD 4 Connect the cable to recorder VOLTAGE input terminals ensure that polarity is correct 5 On the Master Board Figure 2 6 a Connect the recorder cable to the TB4 terminals labeled CUR OUT TB4 3 and TB4 4 6 Connect the cable to the recorder CURRENT input terminals ensure that polarity is correct 2 4 ELECTRICAL POWER ...

Страница 29: ...tage Electrical power is supplied to the analyzer via a customer supplied three conductor cable type SJT minimum wire size 18 AWG Route the power cable through conduit and into the appropriate opening in the instrument case see drawing 654625 On TB6 Figure 2 5 connect cable leads to terminals 1 HOT L1 2 NEUT L2 and 3 GND FIGURE 2 9 CASE HEATER TEMPERATURE CONTROL BOARD S3 Set switch window for vol...

Страница 30: ...INSTALLATION 18 December 2000 Rosemount Analytical 748221 L Model 7D Thermal Conductivity Analyzer NOTES ...

Страница 31: ...ion For use of sealed in reference gas refer to Figures 2 1 and 2 3 For flowing reference gas refer to figures 2 2 and 2 4 3 3 STARTUP PROCEDURE If explosive gases are introduced into this analyzer the sample containment system must be carefully leak checked upon installation and before initial startup during routine maintenance and any time the integrity of the sample containment system is broken...

Страница 32: ...re of 10 to 50 psig f 69 to 345 kPa 3 Provide a sample flow of 50 to 350 cc minute through the analyzer A rate of 250 cc minute is recommended unless faster flow is desired to reduce sample transport time 4 If the thermal conductivity cell uses flowing reference gas provide a reference flow of 5 to 50 cc minute 5 Refer to drawing 654642 and Figure 2 6 Connect the cable from TB6 to J2 on the Master...

Страница 33: ...obtainable by adjustment of the ZERO control refer to Section 6 2 2 2 Set upscale calibration point as follows a If the analyzer has a front panel RANGE switch set it for the desired range b Admit upscale calibration gas to the analyzer at the same flow rate as is used for sample gas Wait for the reading on the meter or recorder to stabilize c On the analyzer adjust the front panel SPAN control so...

Страница 34: ...INITIAL STARTUP 22 December 2000 Rosemount Analytical 748221 L Model 7D Thermal Conductivity Analyzer NOTES ...

Страница 35: ... To avoid use of a calibration curve in an application where it would otherwise be required the analyzer may be equipped with an optional linearizer board If so the linearizer board is factory set for a given range only and is not usable on another range Note that a linearizer is usable only if nonlinearity at midscale does not exceed 20 of fullscale 4 2 RECOMMENDED CALIBRATION FREQUENCY Provided ...

Страница 36: ...OPERATION 24 December 2000 Rosemount Analytical 748221 L Model 7D Thermal Conductivity Analyzer NOTES ...

Страница 37: ...ge See section 5 2 4 The power supply output is adjusted to provide an appropriate voltage across bridge terminals 1 and 2 An electric current flows through the filaments heating them and thus increasing their electrical resistance The heat dissipation rate for each filament depends on the thermal conductivity of the surrounding gas Initially with downscale calibration gas flowing through the samp...

Страница 38: ... AR1 and thus permits adjustment of AR1 gain from X1 to X100 This adjustment sets the sensitivity for Range 1 i e the highest sensitivity range RANGE PROVISIONS In the basic single range Model 7D a jumper is connected from TB3 1 to TB3 4 thus routing the unattenuated output from AR1 directly to the non inverting input of AR2 During factory assembly of a dual range or triple range instrument the ju...

Страница 39: ... values are in ohms Bridge Power Supply Bridge Power Supply B FUNCTIONAL DIAGRAM OF BRIDGE CIRCUIT Thermal Conductivity Cell Block Reference Filaments Reference Gas In Sample Gas In Sample Filaments NOTE Cell Block Sectioned Through Sample Side Section Through Reference side is Similar O Ring Seals Sample Gas Out Reference Ports Capped if Cell Uses Sealed In Non Flowing Reference Gas A SECTIONAL V...

Страница 40: ...is a function of the degree of imbalance in the bridge circuit but is not linear with respect to the concentration of the measured component Providing that the nonlinearity of the calibration curve does not exceed 20 at midscale for 50 H2 max the Voltage Output Linearizer Board PN 633756 may be used to equip a given operating range for linear readout of concentration on the meter and on a potentio...

Страница 41: ...613560 It consists of a power transformer fullwave rectifiers CR1 and CR2 voltage regulator Q1 and an RC filter network Bridge voltage as measured between bridge terminals 1 and 2 is adjustable from 5 to 13 VDC via R2 Proper setting depends primarily on filament material 3 to 4 VDC for tungsten 5 to 12 VDC for Hitempco Bridge voltage is factory set as required for the application see Data Sheet an...

Страница 42: ...fect the resistance of the sensor connected to J18 This in turn changes the bias of amplifier AR1 which controls the input to the case heater via switch U2 The heater receives power through pins 3 4 and or 5 depending on the voltage selected at switch S3 A thermal fuse at J5 prevents the case from overheating 5 2 8 DUAL ALARMS OPTION Instruments with optional Dual Alarms have two pots on the front...

Страница 43: ...f performance is normal with standard gases although not with sample gas the sample and the sample handling system are suspect Check these areas 2 If analyzer gives offscale or erratic readings with standard gases as well as with sample gas the problem might be the filaments or the electronic circuitry To isolate the malfunction substitute fixed precision resistors of appropriate value for the fil...

Страница 44: ...nt across points 6 and 2 corresponds to the filament across 5 and 2 6 2 ELECTRONIC CIRCUITRY 6 2 1 AMPLIFIER ZERO ADJUSTMENTS The zero adjustments on the Master Board are factory set and normally do not require readjustment except after replacement of a major component If readjustment becomes necessary use following procedure AR2 ZERO ADJUSTMENT 1 Open the input to AR2 In a single range instrument...

Страница 45: ...el meter is appropriate to the upscale calibration gas 4 If the analyzer has three ranges set the front panel RANGE Switch for Range 3 This is the least sensitive range Then on the Master Board set Range 3 Attenuation Adjustment R9 so that the reading on the recorder if used or on the front panel meter is appropriate to the upscale calibration gas 5 If previous readings were obtained on a recorder...

Страница 46: ...low the startup procedure in Section 3 3 After the analyzer has stabilized use appropriate calibration gases to make the following adjustments Refer to Section 2 2 2 for information on selecting appropriate gases Note For instruments with more than one range RANGE 1 is the most sensitive range it must be set for the highest gain This range should be used for the smallest span Always start procedur...

Страница 47: ...ount Analytical December 2000 35 Model 7D Thermal Conductivity Analyzer RANGE 2 Set the Range Switch to RANGE 2 In step 4 adjust R6 and in step 5 adjust R7 RANGE 3 Set the Range Switch to RANGE 3 In step 4 adjust R26 and in step 5 adjust R9 ...

Страница 48: ...SERVICE AND MAINTENANCE 36 December 2000 Rosemount Analytical 748221 L Model 7D Thermal Conductivity Analyzer NOTES ...

Страница 49: ...he exchange policy covering circuit boards the following list does not include individual electronic components If circumstances necessitate replacement of an individual component which can be identified by inspection or from the schematic diagrams obtain the replacement component from a local source of supply 7 2 REPLACEMENT PARTS 7 2 1 SELECTED REPLACEMENT PARTS 652270 3 4 Temperature Control As...

Страница 50: ...AC Figure 7 2 000516 3 Fuse 3A 115VAC Figure 7 2 652816 3 Isolated Current Output Board Figure 7 2 616443 3 Linearizer Kit Factory Installed option Consult factory Figure 7 2 654620 Master Board Figure 7 2 193311 Meter Figure 7 1 898672 SPAN Potentiometer Figure 7 1 901917 ZERO Potentiometer Figure 7 1 7 2 2 TEMPERATURE CONTROL ASSEMBLY Refer to Figure 7 3 622733 Fan 622732 Heater 624006 Temperatu...

Страница 51: ...ermal Conductivity Analyzer FIGURE 7 1 ANALYZER ASSEMBLY DOOR AND PNEUMATIC COMPONENTS 193311 Meter SPAN Potentiometer 898672 ZERO Potentiometer 901917 ALARM 1 Potentiometer Kit 654648 RANGE Switch Kit 654892 ALARM 2 Potentiometer Kit 654648 Flame Arrestor 638426 REF Hinge Side ...

Страница 52: ...IGURE 7 2 ANALYZER ASSEMBLY ELECTRONIC COMPONENTS Alarm Kit 654648 15V Power Supply 619714 Linearizer Board option 616443 Isolated Current Output Board 652816 Bridge Power Supply 613560 Fuse 000516 115 VAC 801566 230 VAC Cell Enclosure REF Hinge Side Temperature Control Assembly 652270 Master Board 654620 ...

Страница 53: ...t Analytical December 2000 41 Model 7D Thermal Conductivity Analyzer FIGURE 7 3 TEMPERATURE CONTROL ASSEMBLY Temperature Control Board 624006 Heater Assembly 622732 Fan Assembly 622733 Sensor 622917 Thermal Fuse 624433 Sensor 622917 Ref ...

Страница 54: ...REPLACEMENT PARTS 42 December 2000 Rosemount Analytical 748221 L Model 7D Thermal Conductivity Analyzer NOTES ...

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