KROHNE VFM3100 User Manual

Variable area flowmeters

Vortex flowmeters

Flow controllers

Electromagnetic flowmeters

Ultrasonic flowmeters

Mass flowmeters

Level measuring instruments

Communications engineering

Engineering systems & solutions

KROHNE 09/98 1.2M87E1099876

Installation and operating instructions

VFM 3100 F - T VFM 3100 W- T

Vortex Flowmeter

3.2. No Output Troubleshooting 27

3.3. Module Test Procedure 28

3.4. Preamplifier Test Procedure 28

3.4.1. Extended Temperature Range Sensor 28

3.4.2. Standard Temperature Range Sensor 28

3.5. Sensor Test Procedure 29

3.5.1. Standard Temperature Range Sensor 29

3.5.2. Extended Temperature Range Sensor 29

4. Maintenance 29

4.1. Introduction 29

4.1.1. Vortex Generation and Shedding 29

4.1.2. Vortex Sensing 29

4.1.3. Amplification, Conditioning and Processing 29

4.2. Electronic Module 30

4.2.1. Electronic Module Removal 30

4.3. Electronic Module Replacement 33

4.4. Preamplifier 34

4.4.1. Preamplifier Removal 34

4.4.2. Replacing the Preamplifier 35

4.5. Post-Assembly Dielectric Test 37

4.6. Sensor Replacement with Integral Electronic Module 37

4.6.1. Disassembly 37

4.6.2. Replacing the Sensor 38

4.7. Sensor Replacement with Remote Electronic Module 41

4.7.1. Disassembly 41

4.7.2. Assembly 42

5. Determining Special Measuring Units 43

6. Isolation Valves 43

6.1. Replacing the Sensor 43

6.2. Replacing or Installing an Isolation Valve 44

7. HART Configuration Instructions 45

7.1. Introduction 45

7.2. HART Menu Structure 45

8. Local Configuration Instructions 49

8.1. Introduction 49

8.2. Using the Local Configurator 49

8.2.1. Measurements (MEASURE) 49

8.2.2. Display Bar Indicator 49

8.2.3. Moving inside the Menu System 49

8.2.4. Viewing Data (DISPLAY) 50

8.2.5. Answering a Question 50

1. Installation 6

1.1. Introduction 6

1.1.1. Description 6

1.1.2. Fundamental Installation Requirements 6

1.1.3. Standard Specifications 7

1.1.4. Electrical Safety Specifications 8

1.1.5. Unpacking 8

1.1.6. VFM 3100 Identification 8

1.2. Mechanical Installation 9

1.2.1. Piping Considerations 9

1.2.2. Installation Position 10

1.2.3. Ambient Temperature 10

1.2.4. Vibration 10

1.2.5. Installation Procedure 12

1.2.6. Repositioning the Electrical Housing 12

1.2.7. VFM 3100 with Remote Electronic Module 13

1.3. Field Termination 19

1.3.1. Conduit Connections 19

2. Operating the VFM 3100 22

2.1. Introduction 22

2.2. Passwords 22

2.3. Configuration Database 22

2.4. Changing the Configuration (Configuration Menu) 23

2.4.1. Identification Parameters 23

2.4.2. Transmitter Options 23

2.4.3. Process Fluid Parameters 25

2.4.4. Application Parameters 25

2.4.5. Output Options 25

2.5. Preconfiguring the VFM 3100 26

2.6. Displaying the Configuration Database 26

2.7. Adjusting the VFM 3100 26

2.7.1. mA Calibration (D/A Trim) 26

2.7.2. Total Reset 26

2.7.3. Low Flow Cut-In 26

2.7.4. Upper Range Value 26

2.8. Reading the Measurements 26

2.9. Testing the VFM 3100 and Loop (Test Menu) 26

2.9.1. Self-Test 26

2.9.2. Loop Test or Loop Calibration 26

2.10. Electronic Module Replacement 26

3. Troubleshooting 27

3.1. General Troubleshooting 27

3.1.1. VFM 3100 Has Incorrect Output 27

3.1.2. VFM 3100 Output Indicates Flow When There Is No Flow 27

3.1.3. VFM 3100 Output Indicates Higher Flow Rate with Decreasing Flow 27

3.1.4. Fluctuating Output 27

Contents

8.2.6. Entering the Password 50

8.2.7. Activating an Edit, Pick-List or

User Function Menu Block 50

8.2.8. Editing Numbers and Strings 50

8.2.9. Picking from a List 50

8.2.10. mA Calibration

(TEST/CAL 4 mA or CAL 20 mA) 50

8.2.11. Transmitter Status 50

8.2.12. Changing the Password 50

8.3. Local Configurator Menu Tree 51

8.3.1. Reading the Menu Tree 51

8.4. Local Configurator Menu (1 through 8) 51

9. Configuration Database 59

9.1. Flowtube Parameters 59

9.2. Identification Parameters 59

9.3. Transmitter Options 60

9.4. Process Fluid Parameters 60

9.5. Application Parameters 61

9.6. Output Options 61

1 VFM 3100 F-T Flange Body 6

2 VFM 3100 W-T Sandwich Body 6

3 VFM 3100 Identification 9

4 Typical Piping Configuration 9

5 Pressure and Temperature Tap Locations 10

6 VFM 3100 F Installation 12

7 VFM 3100 W Centering (using Spacers OR Sleeves) 12

8 Repositioning the Electrical Housing 13

9 Overall View of Remote Mounted VFM 3100 16

10 Electronics Housing 19

11 Installation Wiring - 4-20 mA Output (Two-wire) 20

12 Load Requirements 20

13 Installation Wiring - Pulse Output (Three-wire) 21

14 Installation Wiring (Four-wire) 21

15 Normal Vortex Frequency Waveform 29

16 VFM 3100 Block Diagram 30

17 Electronic Module Connections -

Standard Temperature Range (Integral Mount) 31

18 Electronic Module Connections - Extended

Temperature Range 31

19 Electronic Module with Display Connections 32

20 Electronic Module Connections -

CENELEC Certified Extended and Standard Temperature Range 32

21 Electronic Module - CENELEC Certified Flameproof 33

22 Preamplifier Assembly - Integral Mount

Extended Temperature Range 34

23 Preamplifier Assembly - Remote Mount Assembly 34

24 Preamplifier - Remote Mounted VFM 3100

(CENELEC Certified Flameproof) 35

25 Preamplifier Assembly 36

26 Preamplifier - Remote Mounted VFM 3100 37

27 Connections for Post-Assembly Dielectric Test 37

28 VFM 3100 Assembly 38

29 O-Ring/Sensor/Flow Dam 39

30 Electrical Housing/Mechanical Connector 39

31 VFM 3100 Assembly 39

32 Connector Bolt Torquing Sequence 40

33 Connector Bolt Torquing Sequence 40

34 Flowtube/Junction Box –

Standard Temperature Range 41

35 Flowtube/Junction Box -

Extended Temperature Range 41

36 VFM 3100 Assembly/Junction Box 42

37 Sensor/Mechanical Connector/Junction Box 42

38 Isolation Valve 44

39 Dual Manifold 45

40 HART On-Line Menu Structure 46

41 Fast-Key Function/Variable Chart 48

42 Local Configurator Menu 51

Figures

1 Standard Specifications 7

2 Electrical Safety Specifications 8

3 VFM 3100 Mounting Arrangements 11

4 Preparation of Remote Signal Cable 14

5 Preparation of Remote Signal Cable (Electronics End) 15

6 Connection of Remote Signal Cable 17

7 Connection of Remote Signal Cable (Electronics End) 18

8 Configuration Database 22

9 User Information 22

10 Electronic Module Terminal Block Connections 30

11 Maximum Test Pressure 40

12 Menu Tree Functional Overview 49

13 Configuration Database 59

Tables

1. Installation

1.1 Introduction

1.1.1 Description

The VFM 3100 F/W-T (Figures 1 and 2) measure fluid (liquid, gas, or steam) flow rates using the principle of vortex shedding. Fluid flowing through the VFM 3100 body passes a specially shaped vortex shedder that causes vortices to form and shed alternately from the sides of the shedder at a rate proportional to the flow rate of the fluid. These shedding vortices create an alternating differential pressure that is sensed by a detector located above the shedder. A pulsed voltage is generated by the detector with a frequency that is synchronous with the vortex shedding frequency. This voltage is then conditioned by the electronic module to produce either a pulse rate signal or an analog (4 to 20 mA dc) signal.

1.1.2 Fundamental Installation Requirements

Meters shall be installed to meet all applicable local installation regulations, such as hazardous location requirements, electrical wiring codes, and mechanical piping codes. Persons involved in the installation should be trained in these code requirements in order to ensure that the installation takes maximum advantage of the safety features designed into the VFM 3100.

Figure 2. VFM 3100 W-T Sandwich Body

Figure 1. VFM 3100 F-T Flange Body

1.1.3. Standard Specifications

Table 1.

Item Specification

Process Temperature Limits -20 and +430 °C (0 and 800 °F)

(a)

Ambient Temperature Limits -40 and +85 °C (-40 and +185°F)

Power Supply Requirements:

Supply Voltage Limits 12,5 and 42 V dc

Supply Current 22 mA dc

Product Safety Specification Refer to instrument data plate for type of certification and

observe aplicable wiring requirements. Electrical certifications and conditions of certification are listed on page 8.

Flow Rate Requirements Rd = 5000 minimum: Automatic compensation for the

non-linear behavior of vortex shedding in the Rd range 5000 to 20000 is built into the VFM 3100. This compensation requires the user to input values for the flowing density and viscosity.

Static Pressure Limits Full vacuum to pressure rating of mating flanges

with maximum operative limit of 10 MPa (1500 psi: 100 bar or kg/(cm

) at 24°C (75°F).

VFM 3100 Output

Analog 4 to 20 mA dc into a maximum of 1450 ohms depending

on power supply (refer to graph in Figure 12).

Digital (HART) Digital signal conveyed at a 1200 baud transmission rate.

HART protocol.

Scaled Pulse Isolated 2 wire „contact closure”. Pulse rate

(0 to 100 Hz) proportional to volumetric flow rate.

Scaled Pulse Output Specifications • Isolated 2-wire contact-closure

• Applied voltage limits:

12.5 Vdc minimum

42.0 Vdc maximum

• Maximum „ON” state voltage drop: 0.5 Vdc

• Maximum „ON” state current: 250 mA

• Update rate: 4 Hz

• Maximum „OFF” state leakage current:

0.10 mA @ 12.5 Vdc

0.25 mA @ 24.0 Vdc

0.42 mA @ 42.0 Vdc

• 250 mA short circuit protected

• Reserve polarity protected

Signal Output Combinations 2-Wire Hook-Up

4-20 mA and HART (1200 baud)

3-Wire Hook-Up

4 to 20 mA, HART (1200 baud) and Scaled Pulse

4-Wire Hook-Up

4 to 20 mA, HART (1200 baud) and Scaled Pulse

(a) Maximum temperature limit is a function of sensor type.

After removing the flowtube from its shipping carton, inspect it for visible damage. If any damage is observed, notify the carrier immediately and request an inspection report. Obtain a signed copy of the report form the carrier. The calibration certificate and any other documentation shipped with the VFM 3100 should be separated from the packing material and held for future reference. Re-install any flange covers or protective material to safeguard the VFM 3100 until it is installed. Packing material should be disposed of in accordance with local regulations. All packing material is non-hazardous and is generally acceptable to landfills.

1.1.6. VFM 3100 Identification

The model code is stamped on the data plate as shown in Figure 3 and is digitally readable from the configuration menu. The Standard Temperature Range sensor is made of 316 stainless steel and is filled with silicone oil, maximum temperature 200 °C (400 °F). An optional fill is Fluorolube, maximum temperature 90 °C (200 °F). The Extended Temperature Range sensor is made of 316 stainless steel and is unfilled, maximum temperature 430 °C (800 °F). Both standard and high temperature sensors are available made from Hastelloy.

1.1.4. Electrical Safety Specifications

Table 2.

CSA

intrinsically safe for Class I, Division I, Groups A, B, C, D; Class II, Division I, Groups E, F, G: and Class III, Division I

CSA explosionproof for Class I, Division I, Groups C and D; dust-ignitionproof for Class II and III, Division I, Groups E, F, and G; and Class III, Division I.

Suitable for Class I, Division 2, Groups A, B, C, D; class II, Division 2, Groups F, G; and Class III, Division 2.

FM intrinsically safe for Class I, II and III, Division 1, Group A, B, C, D, E, F, and G; nonincendive Class I, II and III, Division 2, Groups A, B, C, D, F, and G.

FM explosionproof for Class I, Division 1, Groups C and D; dust-ignitionproof for Class II and III, Division 1, Groups E, F, and G; nonincendive Class I, II and III, Division 2, Groups A, B, C, D, F, and G.

CENELEC intrinsically safe for EEX ib, Gas Group IIC, Zone 1.

CENELEC flameproof for EEx d (ib), Gas, Group IIC, Zone 1

Testing Laboratory, Type of Protection, and Area Classification

Temperature Class T3C at 85°C and T4A at 40°C maximum ambient. Limited to Gas Groups C and D when connected to 33 V, 185 Ω Zener barrier.

Temperature Class T5.

Temperature Class T3C at 85°C and T4A at 40°C maximum ambient.

Temperature Class T5.

Temperature Class T4 at 0.8 W. Temperature Class T5 at 0.5 W. Temperature Class T6 at 0.3 W.

Temperature Class T6.

Application Conditions

NOTE: These transmitters have been designed to meet the electrical safety descriptions listed in the table above. For detailed information or status of testing laboratory approvals/ certifications, contact KROHNE.

1.1.5. Unpacking

The VFM 3100 is built to be durable, but it is part of a calibrated precision system and should be handled as such.

NOTE: VFM 3100 may (depending on pressure rating of flanges with which they will be used) have a set of centering spacers included. Do not discard these centering spacers. They must be used to install the VFM 3100 properly.

VFM 3100 with remote-mounted electronics are rugged two-piece units. A remote cable connection is assembled to the VFM 3100 junction box and electronics housing. The cable may be cut to the required length per instructions beginning on page 13. Do not allow the weight of either the flowtube or electronics housing to be supported by the remote cable.

Remove the flowtube from the shipping carton using care to avoid dropping or otherwise subjecting it to impact, particularly at the flange or wafer faces. Never put anything through the flowtube for lifting purposes as damage to the shedder bar may occur.

Data Label

Certification Label

Measuring Range Label

Model Code

Serial No.

Productioncode

Maximum Pressure

Style Letter

Temp Limit per Sensor Option

Complete VFM 3100

Calibration Factor

Figure 3. VFM 3100 Identification

1.2. Mechanical Installation

There are two mounting arrangements: integral and remote. The following sections deal with both the integral and remote VFM 3100 arrangements.

1.2.1. Piping Considerations

Effects of Piping on VFM 3100 Performance

The flange size of the adjoining pipe must be the same nominal size as the VFM 3100. Flanges with a smooth bore, similar to weld neck flanges, are preferred. Normal performance data is based on the use of Schedule 40 piping upstream and downstream of the VFM 3100. If this is not the case, the actual schedule must be selected from a picklist during configuration and the distance to the disturbance in pipe diameters entered. This enables the VFM 3100 to automatically compensate for any induced flow effects. In addition, the bore of the pipe (flange) and VFM 3100 must be aligned (see "Installation Procedure" on page 12), and the flange gaskets installed such that they do not protrude into the flow stream.

NOTE: 1. VFM 3100 mounted near pump discharge or suction lines may be exposed to oscillatory flow that may affect vortex shedding or product pipe vibration. Also, VFM 3100 mounted near the discharge of a liquid positive displacement pump or near oscillating control valves may experience severe flow fluctuations that could damage the sensor. To avoid these adverse situations, install the VFM 3100 at least 20 feet or 40 pipe diameters, whichever is larger, from the disturbance in question.

2. It is good piping practive that the internal surface of the pipe shall be free from mill scale, pits, holes, reaming scores, rifling, bumps, or other irregularities for four pipe diameters upstream and two pipe diameters downstream of the VFM 3100.

Consideration for VFM 3100 Repair

When installing the VFM 3100, consider VFM 3100 repair. The VFM 3100 should be accessible for servicing. If the flow cannot be interrupted to replace a sensor, then an isolation manifold should be mounted on the VFM 3100 before it is installed. An acceptable and recommended practice is to install bypass piping so that the entire VFM 3100 may be removed for servicing (see Figure 4).

Liquid Control Installations

It is recommended for liquid flow that the VFM 3100 be mounted upstream at least 5 pipe diameters from the control valve and in vertical installations in the upward flowing leg. This will help to maintain a full pipe and ensure that there is sufficient back pressure to prevent flashing or cavitation.

30 Pipe Diameters recommended

5 Pipe Diameters recommended

Shutoff Valves

Figure 4. Typical Piping Configuration

Gas Control Installations

For gas control installations, there are choices for VFM 3100 location that should be considered. For maximum rangeability, locate the VFM 3100 30 or more pipe diameters downstream from a control valve. This will assure maximum velocity at the VFM 3100 and produce the most efficient signal from the sensor. When the flow is more stable, the VFM 3100 may be mounted a minimum of 5 pipe diameters upstream of the control valve. Pressure fluctuations often are less on the upstream side of a control valve. This should be considered as a means to provide the most accurate density when a flow computer is not used. The VFM 3100 electronics automatically calculates the effect of upstream piping on K-factor when installation piping data is entered by user.

Steam Control Installations

For steam control installations, it is recommended that the VFM 3100 be mounted 30 pipe diameters or more downstream of the control valve. This is particularly useful when measuring saturated steam to ensure that there is a minimum amount of condensate present at the VFM 3100.

Pressure and Temperature Taps

NOTE: The inside of the pipe at the pressure and temperature taps must be free of burrs and obstructions.

Pressure Taps -- For density measurement (when required), locate the tap 3-1/2 to 4-1/2 pipe diameters DOWNSTREAM of the VFM 3100. See Figure 5.

NOTE: On a gas installation, the pressure tap should be located on the top of the pipe. On a liquid installation, the pressure tap (if required) should be located on the side of the pipe. On a steam installation, the pressure tap should be located on the top when the pressure measuring device (typically a pressure transmitter) is above the pipeline, and on the side when the measuring device is below the pipeline. With vertical piping, the pressure tap may be located anywhere around the circumference of the pipeline.

Temperature Taps -- For temperature measurement (when required), locate the tap 5 to 6 pipe diameters DOWNSTREAM of the VFM 3100. The smallest possible probe is recommended to reduce flow disturbance. See Figure 5.

1.2.2. Installation Position

For optimal performance the locations of the sensor and integral electronics relative to the piping must be considered. Factors that influence this decision include process fluid type, ambient temperature, and vibration.

Process Fluid

When using: Saturated Steam: The electronics housing should be below the

VFM 3100 body, so that the sensor cavity remains filled with condensate.

NOTE: A VFM3100 used on steam should be located downstream of a control valve.See "Steam Control Installations."

Superheated Steam: The electronics housing should be below the VFM 3100 body when the steam has less than 10 °F (5.6 °C) superheat. The housing should be above the VFM 3100 body when the superheat is more than 10 °F and no condensate will be forming on the sensor. An isolation valve may be used in superheated steam applications with adequate insulation.

Gas: The electronics housing may be above or below the VFM 3100 body. The normal recommended position of the electronics housing is above the VFM 3100 body.

Liquid: For a liquid with solid particles, the electronics housing should be above the VFM 3100 body. Care should be taken so that entrapped air does not accumulate in the sensor cavity. For a clean liquid, the electronics housing may be mounted below the VFM 3100 body. Care must be taken if there is any sediment or fine dirt, that the particles do not accumulate in the sensor cavity. A VFM 3100 used on liquid should be mounted upstream from a control valve. VFM 3100 may also be mounted with the electronics housing positioned to the side. This ensures escape of entrapped air and minimizes sediment accumulation. The above considerations are summarized in Table 3 for single and dual measurement VFM 3100 with and without isolation valves.

1.2.3. Ambient Temperature

Ambient temperature limits must be observed per specifications. However, if the electronic housing is above the ambient temperature limit (85 °C, 185 °F), the VFM 3100 may be mounted with the electronic housing located to the side to aid the cooling of the electronic module. The bottom conduit connection shoud be used (the top one plugged) to avoid possible accumulation of condensate at the terminal block.

1.2.4. Vibration

The vortex shedder axis should be oriented to reduce or, in some cases virtually eliminate, vibration influence. Positioning VFM3100 so that vibrations are parallel to sensor diaphragms will minimize effect of vibrations.

Pressure Tap

Temperature Tap

Direction of Flow

Figure 5. Pressure and Temperature Tap Locations

Table 3. VFM 3100 Mounting Arrangements

Single Measurement (with and without isolation valves)

Housing Above Pipe GAS Recommended mounting.

STEAM Recommended for super-heated steam with adequate

insulation. Not recommended for saturated steam.

LIQUID Adequate self-purging. Recommended mounting.

Isolation Valve may cause temporary start-up error due to entrapped air.

Vertical Pipe GAS Recommended mounting.

STEAM Recommended for super-heated steam with adequate

insulation. Not recommended for saturated steam.

LIQUID Adequate self-purging. Recommended mounting.

Housing Below Pipe GAS Recommended for clean applications only.

STEAM Not recommended for super-heated steam.

Recommended for saturated steam.

LIQUID Recommended when self-purging is important.

Housing Beside Horizontal Pipe GAS Recommended mounting.

STEAM Not recommended for saturated steam. Recommended

for superheated steam provided the pipe is adequately insulated.

LIQUID Adequate self-purging, recommended mounting.

Housing to the Side and Below Horizontal Pipe

Note: Requires flanges with eight or more bolts

GAS Not recommended STEAM Not recommended LIQUID Recommended.

Dual Measurement (with or without isolation valves)

Housing Above Pipe GAS Recommended mounting.

STEAM Recommended for super-heated steam with adequate

insulation. Not recommended for saturated steam.

LIQUID Not self-purging. May cause errors at startup.

Not recommended for batch operations.

Vertical Pipe GAS Recommended mounting.

STEAM Recommended for super-heated steam with adequate

insulation. Not recommended for saturated steam.

LIQUID Adequate self-purging. Recommended mounting.

Housing Below Pipe GAS Not recommended.

STEAM Not recommended for super-heated steam.

Recommended for saturated steam.

LIQUID Self-purging. Recommended for batch operations.

1.2.5. Installation Procedure

VFM 3100 F–Flanged Body

• Gaskets are required and must be supplied by the user. Select a gasket material suitable for the process.

• Insert gaskets between body of VFM 3100 and adjacent flanges. See Figure 6. Position gaskets so that ID of each gasket is centered on ID of VFM 3100 and adjacent piping.

CAUTION:

• Verify that the ID of the gaskets is larger than that of the VFM 3100 bore and pipe and that they do not protrude into the VFM 3100 entrance or exit. Accuracy of the measurement will be affected.

• Gaskets will not prevent flanges from being wetted by process fluids.

NOTE: When installing new flanges in the process piping and the VFM 3100 is used as a gauge to set the flanges, the inside diameter of the VFM 3100 must be protected from weld splatter. It is recommended that a solid sheet of gasketing be installed at each end of the VFM 3100 during welding. Remove this sheet and install flange gasket after welding. Remove any splatter in either the pipe or the VFM 3100 as this could affect VFM 3100 accuracy.

• Visually inspect for concentricity of mating flanges.

• Tighten bolts in accordance with conventional flange bolt tightening practice (i.e., incremental and alternate tightening of bolts).

VFM 3100 W– Sandwich Body

For optimal performance, the sandwich body VFM 3100 should be centered with respect to the adjoining pipe. Normally, this requires the use of centering fixtures that are supplied with the VFM 3100.

NOTE: Centering fixtures are not required for meters with ANSI Class 150 flanges.

Two types of centering fixtures are presently in use; the older centering sleeves and the newer hex-nut spacers. The VFM 3100 may come with either type of fixture. Most meter sizes have two centering fixtures (two sets in the case of the hex-nut spaceres), but some larger sizes may have twice this number, two for each side.

• See Figure 7. Insert the first stud through the downstream flange at one of the lower holes, through the centering sleeves or two hex-nut spacers, and then through the upstream flange. Place the nuts on both ends of the stud but do not tighten.

• Using the remaining centering sleeve or hex-nut spacers, repeat Step 1 at the lower hole adjacent to the first.

• Set the VFM 3100 between the flanges. For centering with the hex-nut spacers, rotate spacers to the thickness that centers the VFM 3100.

NOTE: By rotating the hex-nut spacers to the correct thickness, you can center the VFM 3100 to any type of flange.

• Gaskets are required and must be supplied by the user. Select a gasket material suitable for the process fluid.

• Insert gaskets between body of VFM 3100 and adjacent flanges. Position gaskets so that ID of each gasket is centered on ID of VFM 3100 and adjacent piping.

CAUTION: Verify that the ID of the gaskets is larger than that of the VFM 3100 bore and pipe and that they do not protrude into the VFM 3100 entrance or exit.

NOTE: If welding of flanges to the process piping is required, protect the VFM 3100 from weld splatter, which could affect VFM 3100 accuracy. It is recommended that a solid sheet of gasketing be installed at each end of the VFM 3100 during welding. Remove this sheet and install flange gasket after welding.

• Visually inspect for concentricity of mating flanges.

• Install the rest of the studs and nuts and tighten the nuts in accordance with conventional flange bolt tightening practice (i.e., incremental and alternate tightening of bolts).

1.2.6. Repositioning the Electrical Housing

The VFM 3100 housing may be repositioned up to a maximum of 270°C from its original position by rotating the electrical housing.

WARNING: Stops are incorporated in the housing design. Do not remove the stops as further rotation from the 270°C maximum may cause damage to the sensor wires. Additionally this may violate safety code requirements for explosion-proof thread engagement in hazardous locations.

• Unscrew housing locknut to bottom of thread. See figure 8.

• Square locking plate should slip down on shaft. If it does not, pry out with scewdriver.

• Rotate electrical housing to desired position. See Warning on page 12.

• Note recess on bottom of electrical housing into which the locking plate fits. Screw the locking nut hand tight making sure locking plate fits into recess on bottom of electrical housing.

• Secure the locknut firmly using a wrench.

Gasket

VFM 3100

Gasket

Install centering fixtures on adjacent lower studs of flange

VFM 3100

2 hex-nut spacers per side (not required with class 150)

Hex-nut alignment device (not required with class 150)

Centering sleeve (not required with class 150)

Figure 6. VFM 3100 F Installation

Figure 7. VFM 3100 W Centering (using Spacers OR Sleeves)

Larger meters have 2 centering fixtures per side

1.2.7. VFM 3100 with Remote Electronic Module

The purpose of the remote electronic module is to allow for separation of the VFM 3100 body and the electronics housing. This VFM 3100 consists of:

• An electronics housing mounted to a pipe or wall mounting bracket with up to 15 m (50 ft) of interconnecting cable attached.

• A VFM 3100 body with junction box. The junction box contains a preamplifier assembly. Refer to Figure 9.

• 1/2 NPT conduit connections are provided on both the housing and the junction box.

NOTES:

• Mount the VFM 3100 so that the junction box is serviceable.

• The cable is prewired to the junction box to ensure proper grounding of the shield. It is recommended not to disconnect the cable from the junction box.

• If the cable must be disconnected, make sure the end labeled "VFM 3100 End" is positioned at the junction box end.

• If the cable is to be shortened, refer to Table 2 for re-dressing cable ends.

Installing the Remote Electronics

WARNING: For optimum VFM 3100 performance, the remote signal cable must be prepared and connected following the procedures outlined below.

To install the remote electronics as shipped, execute the following procedure:

• Mount the VFM 3100 as described in the preceding section. Be sure to mount the VFM 3100 so that the junction box is serviceable.

• Mount the housing. The bracket assembly supplied with the housing may be mounted directly to a wall or to a 2-inch pipe stand.

• Mount the housing close enough to the VFM 3100 so that the supplied cable will reach between the VFM 3100 and the housing.

To install remote electronics that must be separated, disconnect the remote signal cable at housing end as described below.

It is not recommended that you disconnect the VFM 3100 end (junction-box end).

• Remove electronic compartment threaded cover.

• Unscrew the two captive screws, one on each side of the electronic module.

• Pull out electronic module far enough to disconnect the remote signal cable.

• Disconnect the four remote signal wires from the four position terminal block on rear of the electronic module. See Figure 9.

• Unscrew knurled nut, pull it back onto cable jacket, also pull rubber bushing onto the cable jacket. Leave these parts on the cable jacket as they will be used when reconnecting the cable.

• Mount the VFM 3100 as described in the preceding section. Be sure to mount the VFM 3100 so that the junction box is serviceable.

• Mount the housing close enough to the VFM 3100 so that the supplied cable will reach between the VFM 3100 and electronic housing.

• Mount the electronic housing. The bracket assembly supplied with the housing may be mounted directly to a wall or a 2-inch pipe stand.

Interconnection Wiring for Remote Electronics

Installation without Conduit:

If the VFM 3100 and electronic housing were NOT separated during installation, the interconnection wiring is complete.

NOTE: Oxygen cleaned meters are shipped separated.

If Housing End Is Disconnected:

If the VFM 3100 and electronic housing were separated during installation, follow the procedures below for interconnection wiring.

• Make sure the knurled nut and rubber bushing are on the cable jacket. Orient the cable so that the end labeled "VFM 3100 End" is positioned at the VFM 3100 junction box and the "Electronics End" is positioned at the remote electronics housing.

• If the pre-dressed cable does not look as shown in Table 6, prepare it following the instructions for dressing electronic housing end of remote signal cable in Table 6 on page 17.

• Take the prepared cable, taking care not to damage the copper braid, and push it into the connector at bottom of the electronic housing, as shown in Step 1 of Table 6 on page 17 until it comes to a stop.

• Ensure that the remote signal cable is pushed in all the way, until the outer jacket bottoms out inside the connector. Push the rubber bushing into position, until it sits snug inside the connector, as shown in Step 2 of Table 6 on page 17.

• Tighten the knurled nut on the connector to create a compression fit for a good seal.

• Inside the electronic housing, connect the four remote signal wires to the color coded 4-position terminal block on the rear of the electronic module. See Figure 9 on Page 16.

• Ensure that the remote signal and loop power wires are tucked under the electronic module. Taking care not to pinch the wires, place the module in housing over mounting screws. Tighten the two captive mounting screws.

• Replace threaded housing cover tightly. This will prevent moisture or other contaminants from entering the compartment.

Electrical housing with digital display/configurator

Locknut

Connector

Locking plate

Figure 8. Repositioning the Electrical Housing

For installations where the provided pre-dressed remote signal cable is not used, both ends of the cable being used must be prepared per the instructions in Tables 4 and 5 of document. The cable must be connected at both ends per instructions on Tables 6 and 7 on Pages

17 and 18. Terminate wires at J-Box following Figure 9 on Page 16. At housing end, wires should be terminated at 4-position terminal block on rear of electronic module as shown in Figure 9.

1. Slide the knurled nut and then the rubber bushing onto outer jacket of cable as shown at right. Next, remove outer polyethylene jacket of cable to dimension shown.

2. Cut and remove braided copper shield to dimension shown at right. This will expose the barrier (plastic) tape and foil mylar that encloses the conductors.

3. Cut and remove the barrier tape, foil mylar and fillers to dimension shown at right. This will expose two twisted pairs of conductors (brown-yellow, orange-red) and an uninsulated drain wire. The barrier tape under the copper braid prevents the drain wire from shorting to the copper braid shield.

4. Trim the uninsulated drain wire to dimension shown at right. To expose bare conductors for termination, cut and strip ends of the two twisted pairs to dimension shown.

5. Fold drain wire back onto the copper braid as shown at right. Label outer cable jacket „VFM 3100 End” to avoid confusion during installatin. Cable is now ready for installation.

VFM 3100 End (Junction Box End) Procedures

Knurled nut

Outer polyethylene jacket

Rubber bushing

191 mm (7.5 in)

Copper braid

Knurled nut

Rubber bushing

25 (1.0) 165 mm (6.5 in)

Copper braid

Barrier tape and foil mylar

Outer polyethylene jacket

Knurled nut

Rubber bushing

Copper braid

Barrier tape and foil mylar

Knurled nut

Outer polyethylene jacket

Label cable jacket

Rubber bushing

Copper braid

Barrier tape and foil mylar

25 (1.0) 165 mm (6.5 in)

Two twisted pairs

Uninsulated drain wire

Outer polyethylene jacket

Knurled nut

Rubber bushing

Copper braid do not tape

6.4 mm (.25) cut and strip 4 places

25 (1.0) 165 mm (6.5 in)

25 (1.0)

Two twisted pairs

Uninsulated drain wire

Bare conductor (4 places)

Two twisted pairs

Uninsulated drain wire

VFM 3100

end

Table 4. Preparation of Remote Signal Cable

Table 5. Preparation of Remote Signal Cable (Electronics End)

1. Slide the knurled nut and then the rubber bushing onto outer jacket of cable as shown at right. Next, remove outer polyethylene jacket of cable to dimension shown.

2. Cut and remove braided copper shield to dimension shown at right. This will expose the barrier (plastic) tape and foil mylar that encloses the conductors.

Electronics End (Electronic Housing End) Procedures

Outer polyethylene jacket

203 mm (8.0 in)

Knurled nut

Rubber bushing

Copper braid

178 mm (7.0 in)25 (1.0)

Knurled nut

Rubber bushing

Copper braid

Barrier tape and foil mylar

Knurled nut

Rubber bushing

Copper braid

Barrier tape and foil mylar

Two twisted pairs

Uninsulated drain wire

25 (1.0) 40 (1.5)

4. Cut off drain wire at end of barrier tape and foil mylar as shown ar right. It is not used at this end.

5. Apply shrink tubing or electrical tape to end of barrier tape and foil mylar at location shown at right. Note that the shrink tube or tape covers end of barrier tape and mylar as well as a portion of the 2 twisted pairs of wires. This will prevent the barrier tape and foil mylar from unwrapping.

6. Cut and strip ends of the two twisted pairs to dimension shown at right. Label outer cable jacket ”Electronic End” to avoid confusion during installation. Cable is now ready for installation.

Knurled nut

Copper braid

Barrier tape and foil mylar

cut off here

Two twisted pairs

Outer polyethylene jacket

Knurled nut

Rubber bushing

Shrink tube or electrical tape

cut and strip 4 places

Copper braid do not tape

Label cable jacket

Electronic

end

Barrier tape and foil mylar

Shrink tube or electrical tape

Two twisted pairs

Outer polyethylene jacket

Two twisted pairs

Rubber bushing

Electronic module (see detail „A”)

See table 7 for details of this connection

Disconnect this end when installing.

See table 5 for dressing of cable at this end.

Outside braid makes contact to housing. Braid is compressed for a good electrical connection. See table 6 and 7.

1/2 inch conduit may be connected directly to connectors via 3-piece union/coupler.

Cable must be pushed into stainless steel fittings when installing compression nuts to ensure that the braid is properly seated for a good electrical connection (both ends). See tables 6 and 7.

See table 5 for dressing of cable at this end.

VFM 3100 body.

External earth (ground) connection screw – cenelec flameproof only.

Pre-assembled and dressed junction box

Braided shield and drain wire must be in contact at this end of cable. Note: do not disassemble to install.

Remote cable

Output signal wires

brown

red

orange

yellow

Detail “A”

Figure 9. Overall View of Remote Mounted VFM 3100

1. Take electronics end of prepared remote signal cable and align it as shown at right. Ready for assembly.

2. As shown in the diagrams at right, push the prepared cable assembly into the remote connector. Push until the cable bottoms out (cannot be pushed in any furher). Push rubber bushing into position and tighten the knurled nut onto the remote connector to create a good compression fit.

Electronics End (Electronic Housing End) Procedures

Push cable assembly into connector

Shrink tube or tape

Prepared remote signal cable (electronics end) refer to table 3

Rubber bushing

Knurled nut

Electronics

end

Electronics

end

2 twisted pairs

Remote connector

Compression fit of copper braid in contact with connector for shielding

Knurled nut

Remote signal cable

Shrink tube or electrical tape

Rubber bushing

Table 6. Connection of Remote Signal Cable

1. Take VFM 3100 end of prepared remote signal cable and align it as shown at right. Ready for assembly.

2. As shown in the diagrams at right, making sure that the drain wire is folded back against the copper braid, push the cable assembly into the remote connector. Push until the cable bottoms out (cannot be pushed in any further). Push rubber bushing into position and tighten the knurled nut onto the remote connector to create a good compression fit.

VFM 3100 End (Junction Box End) Procedures

VFM 3100

end

Push cable assembly into connector

2 twisted pairs

Prepared remote signal cable (VFM 3100 end) refer to table 2

Drain wire folded back

Rubber bushing

Knurled nut

Remote signal cable

VFM 3100

end

Rubber bushing

Shrink tube or electrical tape

2 twisted pairs

Junction box connector

Compression fit of drain wire and copper braid in contact with connector for shielding

Table 7. Connection of Remote Signal Cable (Electronics End)

Installation with Conduit:

• The junction box is pre-wired. A conduit box or conduit may be mounted directly to the 1/2 NPT connection at the remote housing. A box or a standard 3-piece union/coupler may be mounted directly over the knurled nut. Do not disassemble pre-wired connection at junction box.

• Run remote cable to the remote electronic module housing via conduit. If required, prepare cable as shown in Table 5. Feed it into the housing following Steps in the procedure for "Interconnection Wiring for Remote Electronics" on page 13 and Table 6 on page 17.

• Mount conduit box or conduit to the 1/2 NPT connector directly or via a 3 piece union/coupler, if necessary. Make connection to the 1/2 NPT connector after the knurled nut has been tightened to provide a compression fit for the cable. Refer to Table 6 on page 17.

• At this point, follow Steps in the procedure for "Installation Without Conduit" on page 13.

CENELEC Flameproof Version:

• The junction box side of the remote confirguration is pre-wired. Add flameproof cable gland or E-Y fitting and conduit directly to the special Foxboro adapter or via an approved CSA/UL 3piece union/coupler, if necessary. For this reason, the second conduit plug is fitted with a grounding screw (see Figure 9).

NOTE: CENELEC certification requires that an infallible physical earth (PE) connection be made to the junction box.

• Run the remote cable to the remote electronic module housing via cable trays or conduit.

• Place knurled nut and rubber bushing over the cable as shown in Table 5 on page 15.

• Prepare the remote cable as shown in Table 5.

• Remove the locked electronic module component cover from remote electronic module housing. Unscrew captive mounting screws and remove the electronic module without disconnecting loop power wiring.

• Feed prepared remote cable into the electronics housing through connector at bottom of housing. Push it in until the outer jacket bottoms out inside the connector. See Table 6.

• Ensure that the cable is pushed in all the way and then push the rubber bushing into position. Tighten the knurled nut to create a compression fit. See Table 6.

• Inside the remote electronics housing, connect the four wires of the remote cable to the 4-position terminal block on the rear of the electronic module. Follow the color-coded label. See Figure 9 on Page 16.

• Ensure that the excess remote cable and loop power wires are tucked in under the electronics module. Without pinching, place the module back into the housing and tighten the mounting screws.

• Replace the housing cover tightly to prevent moisture and other contaminants from entering and then lock it in place.

1.3. Field Termination

The following section addresses Wiring, conduit, and Earth (Ground) Connection details.

1.3.1. Conduit Connections

NOTE: The wiring installation shall be in accordance with the local or national regulations applicable to the specific site and classification of the area.

The electronics housing has an electronic module compartment and a field terminal compartment. It also provides 1/2 NPT conduit openings for access from either side of the VFM 3100 and for ease in wiring to the field terminals. See Figure 10.

NOTE: One conduit opening contains a threaded plug. Do not discard this plug.

Remove the field terminal compartment cover (shown in Figure 10) to make electrical connections. Keep the electronic module compartment cover closed to ensure protection for the electronic module and to prevent moisture and atmospheric contaminants from entering the compartment.

There are three wiring combinations that depend on how the VFM 3100 is to be used.

2-Wire Hook-up 4 to 20 mA and HART (1200 baud) 3-Wire Hook-up 4 to 20 mA, HART (1200 baud) and Scaled Pulse 4-Wire Hook-up 4 to 20 mA, HART (1200 baud) and Scaled Pulse

Two-Wire Hook-up

A dc power supply must be used with each transmitter and receiver wiring loop to supply power for the mA signal. The dc power supply may be either a separate signal unit, a multiple unit supplying power to several transmitters, or built into the receiver. Connect the supply and receiver loop wiring (0.50 mm2 or 20 AWG typical) to the terminals in the field-terminal compartment of the transmitter, as shown in Figure 11.

Electronic module compartment

Electrical conduit opening

Field terminal compartment

Figure 10. Electronics Housing

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