Emerson Micro Motion 7835 Installation Manual Download Page 8 | Manualshive

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Sample pressure drop calculations (fluid viscosity equals 2 cP)

Figure 1-1:

A.

Pressure drop (bar)

B.

Flow rate (m

3

/hr)

Note

•

Density = 800 kg/m

3

•

Viscosity = 2 cP

Planning

4

Micro Motion Compact Density Meter 7835/7845 Retrofit

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Summary of Contents for Micro Motion 7835

Page 1: ...Installation Manual MMI 20020999 Rev AC May 2018 Micro Motion Compact Density Meter CDM 7835 7845 Liquid Density Meter Retrofit Installation ...

Page 2: ...ng equipment These procedures ensure legal compliance with government transportation agencies and help provide a safe working environment for Micro Motion employees Micro Motion will not accept your returned equipment if you fail to follow Micro Motion procedures Return procedures and forms are available on our web support site at www emerson com or by phoning the Micro Motion Customer Service dep...

Page 3: ...nting 15 3 1 Mount the meter 15 3 2 Rotate the electronics on the meter optional 16 3 3 Rotate the display on the transmitter optional 17 Chapter 4 Wiring 19 4 1 Wiring to external devices HART multidrop 19 4 2 Terminals and wiring requirements 19 4 3 Retrofit wiring terminal to output conversions 20 4 4 Explosion proof flameproof or non hazardous output wiring 22 4 5 Intrinsically safe output wir...

Page 4: ...Contents ii Micro Motion Compact Density Meter 7835 7845 Retrofit ...

Page 5: ...installation best practices for the removal and in stallation of your meter s See Section 1 3 Confirm any additional wiring external power supplies and or resistance needed to wire to the CDM See Chapter 4 Remove the existing 7835 7845 liquid density meter See Chapter 2 Mount the CDM retrofit meter See Chapter 3 Wire the meter according to the recommended practices for your process environment and...

Page 6: ... processor connections See Section 4 6 Refer to the instructions in the transmitter installation manual for mounting and wiring the 2700 FOUNDATION fieldbus transmitter Consider the maximum cable length between the meter and transmitter The maximum recommended distance between the two devices is 1000 ft 300 m Micro Motion recommends using Micro Motion cable Install the meter so that the flow direc...

Page 7: ...th a single valve install the valve downstream from the meter Minimize bending and torsional stress on the meter Do not use the meter to align misaligned piping The meter does not require external supports The flanges will support the meter in any orientation For bypass configurations using a pump install the pump downstream of the meter to avoid pump heat transfer For bypass configurations mainta...

Page 8: ... pressure drop calculations fluid viscosity equals 2 cP Figure 1 1 A Pressure drop bar B Flow rate m3 hr Note Density 800 kg m3 Viscosity 2 cP Planning 4 Micro Motion Compact Density Meter 7835 7845 Retrofit ...

Page 9: ...5 W typical 1 1 W maximum Minimum recommended voltage 21 6 VDC with 1000 ft of 24 AWG 300 m of 0 20 mm2 power supply cable At startup power source must provide a minimum of 0 5 A of short term current at a minimum of 19 6 V at the power input terminals Intrinsically safe meters 24 VDC 0 7 W typical with 250 Ω barrier 0 96 W maximum with 250 Ω barrier Minimum recommended voltage 22 8 VDC with 1000 ...

Page 10: ...1 3 300ft 600ft 900ft 1200ft 1500ft 1800ft 2100ft 2400ft 2700ft 3000ft B 21 6V 24V 14 15 16 17 18 19 20 21 22 23 24 25 26 A 91 44m 182 88m 274 32m 365 76m 457 2m 548 64m 640 08m 731 52m 822 96m 914 4m A AWG maximum B Distance of installation Planning 6 Micro Motion Compact Density Meter 7835 7845 Retrofit ...

Page 11: ... 400 0 500 0 600 0 700 100m 200m 300m 400m 500m 600m 700m 800m 900m 1000m B 21 6V 24V A 328 084 ft 656 168ft 984 253ft 1312 34ft 1640 42ft 1968 5ft 2296 59ft 2624 67ft 2952 76ft 3280 84ft A Minimum wire area mm2 B Distance of installation Planning Installation Manual 7 ...

Page 12: ...fe meters Minimum wire gauge AWG per feet Figure 1 5 300 600 900 1200 1500 1800 2100 2400 2700 3000 22 8V 24V 14 15 16 17 18 19 20 21 22 23 24 25 26 A B A AWG B Distance of installation Planning 8 Micro Motion Compact Density Meter 7835 7845 Retrofit ...

Page 13: ...um wire area mm2 B Distance of installation 1 6 Spacing requirements When determining spacing requirements be sure to consider the height requirements of the CDM in relation to the existing 7835 7845 meter see Figure 1 8 Planning Installation Manual 9 ...

Page 14: ...nfigured for normal forward reversed or bi directional flow C 2x 1 2 14 NPT female electronic interface Note Drawing dimensions are in inches 7835 7845 meter dimensions height only Figure 1 8 12 6 320 Dimensions in inches mm Explosion Proof 7835 Intrinsically Safe 7835 7845 6 2 158 6 Planning 10 Micro Motion Compact Density Meter 7835 7845 Retrofit ...

Page 15: ...ure the meter in a vertical position with the flow arrow pointing upward 4 Connect the power wiring and power up the meter Remove the back transmitter housing cover to access the PWR terminals Power supply wiring terminals Figure 1 9 MTL7728P 3 4 1 2 A A Barrier wiring is applicable to intrinsically safe installations only 5 Perform a Known Density Verification KDV check Use the Known Density Veri...

Page 16: ...sonnel only Procedure 1 Power down the 7835 7845 meter 2 If the meter is in a hazardous area wait five minutes before proceeding to the next step 3 Remove the thermal insulation from the meter and the surrounding pipework if applicable 4 Remove the electronics housing cover to reveal the 7835 7845 wiring connections 5 Manually record the existing wiring connections to the 7835 7845 meter If you re...

Page 17: ...Standard electronics terminal locations Figure 2 1 Advanced electronics terminal locations Figure 2 2 6 Disconnect wiring from the meter Removing a 7835 7845 meter Installation Manual 13 ...

Page 18: ...formed by suitably trained personnel only in accordance with applicable codes of practice Procedure 1 Disconnect the meter break the seal 2 Remove the meter CAUTION Handle the meter with care when lifting and removing it from the pipeline Micro Motion recommends that you use lifting straps fitted to the flanged ends to account for the meter weight and its sensitivity to impact 3 Dispose of the met...

Page 19: ...imize torque and bending load on process connections Tip To reduce the risk of condensation or excessive moisture the transmitter conduit opening should not point upward if possible The conduit opening of the transmitter can be rotated freely to facilitate wiring CAUTION Do not lift the meter by the electronics Lifting the meter by the electronics can damage the device Mounting Installation Manual...

Page 20: ...ny orientation All pipework joints and couplings must be airtight to minimize the presence of gas bubbles in the fluid 3 2 Rotate the electronics on the meter optional You can rotate the transmitter on the meter up to 90 1 Using a 4 mm hex key loosen the cap screw that holds the transmitter in place Mounting 16 Micro Motion Compact Density Meter 7835 7845 Retrofit ...

Page 21: ...mitter clockwise to the desired orientation up to 90 3 Secure the cap screw in place and tighten to 60 lb in 6 8 N m 3 3 Rotate the display on the transmitter optional The display on the transmitter electronics module can be rotated 90 or 180 from the original position Mounting Installation Manual 17 ...

Page 22: ...in terminals are disengaged from the display module Note If the display pins come out of the board stack with the display module remove the pins and reinstall them 5 Rotate the display module to the desired position 6 Insert the sub bezel pin terminals into the display module pin holes to secure the display in its new position 7 If you have removed the display screws line them up with the matching...

Page 23: ...me Period Signal TPS and Discrete DO outputs require external power and must be connected to an independent 24 VDC power supply For meters connecting to a remote mount Model 2700 FOUNDATION fieldbus transmitter you must wire the meter to the remote mount Model 2700 transmitter using a 4 wire cable connection See the processor wiring content in this manual for information on how to wire the meter T...

Page 24: ... Rewire from 7835 7845 Standard electronics meter To wire from an existing 7835 7845 meter with Standard electronics you must have purchased the CDM with the Time Period Signal TPS output The rewiring from a Standards electronics installation requires reconnecting wiring from the 7835 7845 meter and a signal converter flow computer device Procedure See the following for information on the terminal...

Page 25: ... connect to PWR PWR 4 3 2 Rewire from 7835 7845 Advanced electronics meter To wire from an existing 7835 7845 meter with Advanced electronics you must have purchased one of the following CDM transmitter versions Analog Time Period Signal TPS Any option with Modbus RS 485 Processor for remote mount 2700 FOUNDATION fieldbus Procedure See the following for information on the terminal to output relati...

Page 26: ...ly Analog 3 If using a third mA output no third mA output option is available on the CDM You must wire to an external HART device 1 For further information regarding the status output refer to the 7835 7845 Installation Configuration manual 4 4 Explosion proof flameproof or non hazardous output wiring 4 4 1 Wire the Analog outputs version in an explosion proof flameproof or non hazardous area CAUT...

Page 27: ...irective for Electromagnetic Compatibility EMC use a suitable instrumentation cable to connect the meter The instrumentation cable should have individual screens foil or braid over each twisted pair and an overall screen to cover all cores Where permissible connect the overall screen to earth at both ends 360 bonded at both ends Connect the inner individual screens at only the controller end Use m...

Page 28: ... non hazardous area CAUTION Meter installation and wiring should be performed by suitably trained personnel only in accordance with the applicable code of practice Procedure Wire to the appropriate output terminal and pins see Figure 4 2 Wiring 24 Micro Motion Compact Density Meter 7835 7845 Retrofit ...

Page 29: ...tput with a 24 VDC power supply a maximum total loop resistance of 1300 Ω is allowed CAUTION To meet the EC Directive for Electromagnetic Compatibility EMC use a suitable instrumentation cable to connect the meter The instrumentation cable should have individual screens foil or braid over each twisted pair and an overall screen to cover all cores Where permissible connect the overall screen to ear...

Page 30: ...zardous voltage can cause severe injury or death To reduce the risk of hazardous voltage shut off power before wiring the meter Improper wiring in a hazardous environment can cause an explosion Install the meter only in an area that complies with the hazardous classification tag on the meter Input entity parameters Input entity parameters all connections Table 4 2 Parameter Power supply 4 20 mA Di...

Page 31: ...it voltage to be limited to less than 30 VDC Vmax 30 VDC Hazardous area current The meter entity parameters require the selected barrier s short circuit currents to sum to less than 484 mA Imax 484 mA for all outputs Hazardous area capacitance The capacitance Ci of the meter is 0 0011 μF This value added to the wire capacitance Ccable must be lower than the maximum allowable capacitance Ca specifi...

Page 32: ...icable code of practice Refer to the hazardous area approvals documentation shipped with your meter Safety instructions are available on the Product Documentation DVD and accessible at www emerson com The safety barrier kit provides barriers for connecting all of the available meter outputs Use the provided barriers with the designated output Output s Barrier 4 20 mA MTL7728P 4 20 mA Time Period S...

Page 33: ...UTION In an electrically noisy environment screen the cable in a safe area To meet the EC Directive for Electromagnetic Compatibility EMC use a suitable instrumentation cable to connect the meter The instrumentation cable should have individual screens foil or braid over each twisted pair and an overall screen to cover all cores Where permissible connect the overall screen to earth at both ends 36...

Page 34: ...th the applicable code of practice Refer to the hazardous area approvals documentation shipped with your meter Safety instructions are available on the Micro Motion Product Documentation DVD and accessible on the Micro Motion website at www emerson com The galvanic isolator kit Analog version provides isolators for connecting the following outputs Use the provided isolators with the designated out...

Page 35: ...he EC Directive for Electromagnetic Compatibility EMC use a suitable instrumentation cable to connect the meter The instrumentation cable should have individual screens foil or braid over each twisted pair and an overall screen to cover all cores Where permissible connect the overall screen to earth at both ends 360 bonded at both ends Connect the inner individual screens at only the controller en...

Page 36: ...ccordance with the applicable code of practice Refer to the hazardous area approvals documentation shipped with your meter Safety instructions are available on the Micro Motion Product Documentation DVD and accessible on the Micro Motion website at www emerson com The galvanic isolator kit TPS Discrete version provides isolators for connecting the following outputs Use the provided isolators with ...

Page 37: ...o meet the EC Directive for Electromagnetic Compatibility EMC use a suitable instrumentation cable to connect the meter The instrumentation cable should have individual screens foil or braid over each twisted pair and an overall screen to cover all cores Where permissible connect the overall screen to earth at both ends 360 bonded at both ends Connect the inner individual screens at only the contr...

Page 38: ...switch location plus ON OFF switch position Figure 4 6 1 2 3 4 OFF ON MTL5532 switch settings Table 4 4 Switch ON OFF 1 ON 2 OFF 3 OFF 4 OFF 4 6 Processor wiring for remote mount 2700 FOUNDATION fieldbus option 4 6 1 RS 485 entity parameters for the remote mount 2700 FOUNDATION fieldbus option DANGER Hazardous voltage can cause severe injury or death To reduce the risk of hazardous voltage shut of...

Page 39: ...C Maximum external capacitance Co 85 nF Maximum external inductance Lo 25 µH Maximum external inductance resistance ratio Lo Ro 31 1 µH Ω Cable parameters for Group IIB Maximum external capacitance Co 660 nF Maximum external inductance Lo 260 µH Maximum external inductance resistance ratio Lo Ro 124 4 µH Ω 4 6 2 Connect 4 wire cable 4 wire cable types and usage Micro Motion offers two types of 4 w...

Page 40: ... the conduit to the sensor 3 Pull the cable through the conduit 4 Cut the drain wires and let them float at both ends of the conduit Prepare a cable with user supplied cable glands Prerequisites Important For user supplied cable glands the gland must be capable of terminating the drain wires Procedure 1 Remove the core processor cover using a flat blade screw driver 2 Pass the wires through the gl...

Page 41: ...and cut off the excess drain wires A Drain wires wrapped around shield 7 For foil shielded cable only Note For braided armored cable skip this step and contine to the next step Option Description NPT gland type a Slide the shielded heat shrink over the drain wires Ensure that the wires are completely covered b Apply heat 250 F or 120 C to shrink the tubing Do not burn the cable c Position the clam...

Page 42: ...rough the gland body and tighten the gland nut onto the gland body A Shield folded back B Gland body 4 6 3 Processor wiring for the remote mount 2700 FOUNDATION fieldbus option The following figure illustrates how to connect the individual wires of a 4 wire cable to the processor terminals For detailed information on mounting and wiring to the remote mount 2700 FOUNDATION fieldbus transmitter see ...

Page 43: ...oth ends 360 bonded at both ends The inner individual screen s should be connected at only one end the controller end Metal cable glands should be used where the cables enter the meter amplifier box Unused cable ports should be fitted with metal blanking plugs 4 7 Wiring to signal converters and or flow computers For meters with a Time Period Signal TPS output you can wire the meter to an signal c...

Page 44: ...r Electromagnetic Compatibility EMC use a suitable instrumentation cable to connect the meter The instrumentation cable should have individual screens foil or braid over each twisted pair and an overall screen to cover all cores Where permissible connect the overall screen to earth at both ends 360 bonded at both ends Connect the inner individual screens at only the controller end Use metal cable ...

Page 45: ...fe area To meet the EC Directive for Electromagnetic Compatibility EMC use a suitable instrumentation cable to connect the meter The instrumentation cable should have individual screens foil or braid over each twisted pair and an overall screen to cover all cores Where permissible connect the overall screen to earth at both ends 360 bonded at both ends Connect the inner individual screens at only ...

Page 46: ...plicable follow these guidelines to ground the meter Use copper wire 18 AWG 0 75 mm2 or larger wire size Keep all ground leads as short as possible less than 1 Ω impedance Connect ground leads directly to earth or follow plant standards CAUTION Ground the meter to earth or follow ground network requirements for the facility Improper grounding can cause measurement error Procedure Check the joints ...

Page 47: ...Grounding Installation Manual 43 ...

Page 48: ...777 8211 F 65 6770 8003 Micro Motion United Kingdom Emerson Automation Solutions Emerson Process Management Limited Horsfield Way Bredbury Industrial Estate Stockport SK6 2SU U K T 44 0870 240 1978 F 44 0800 966 181 Micro Motion Japan Emerson Automation Solutions 1 2 5 Higashi Shinagawa Shinagawa ku Tokyo 140 0002 Japan T 81 3 5769 6803 F 81 3 5769 6844 2018 Micro Motion Inc All rights reserved Th...

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