Emerson Micro Motion High Precision HPC010/HPC015 Series High Pressure Coriolis Flow Meter Installation Guide

Emerson Micro Motion High Precision HPC010/HPC015 Series High Pressure Coriolis Flow Meter Installation Guide

In the fields of oil and gas, chemical, and high-pressure fluid measurement, the accuracy, reliability, and safety of flow meters are directly related to process control and asset protection. The Micro Motion brand under Emerson is renowned worldwide for its Coriolis technology. This article is based on Micro Motion ™ The Installation Manual for High Voltage Coriolis Flow Meter (MMI-20035667, Rev AD) provides a systematic technical analysis of the installation preparation, mechanical installation, electrical wiring, grounding, and safety protection of HPC010 and HPC015 high-voltage sensors, aiming to provide professional guidance for on-site engineers.

Product Overview and Application Preparation

The HPC series Coriolis flowmeter is designed specifically for ultra-high pressure applications, providing high-precision mass flow, density, and temperature measurements under extreme process conditions. Before unboxing and installing, engineers need to complete the following key checks:

Environmental and process compatibility: It is necessary to verify whether the explosion-proof certification level on the sensor nameplate is consistent with the hazardous area classification at the installation site. At the same time, it is necessary to confirm that the current ambient temperature and process medium temperature are within the instrument limit range. The temperature range of the process medium for HPC010 is -50 ℃ to 125 ℃, and the ambient temperature is -40 ℃ to 60 ℃; The process medium temperature range of HPC015 is wider, reaching -46 ℃ to 200 ℃, and the ambient temperature is also -40 ℃ to 60 ℃.

Installation orientation planning: To achieve optimal performance, the installation orientation should be selected based on the type of medium. For liquids, it is recommended to flow from bottom to top to ensure that the pipeline is filled; For gases, it is recommended to flow from top to bottom. For self emission applications, sensors should be installed vertically. The manual provides a clear orientation selection table for engineers to refer to.

Vibration assessment: The broadband random vibration limit of HPC010 is 0.35g RMS (according to IEC60068-2-64). If the system vibration exceeds this value or requires certification from a classification society, anti vibration measures must be taken, such as using anti vibration clamps provided by spare parts. HPC015 complies with the IEC60068-2-6 standard and can operate stably in vibration environments of 5-2000Hz and up to 1.0g.

Mechanical installation specifications

2.1 Installation of Sensor Body

HPC010: Usually installed online, using sensor slots on the flange for positioning. It is strictly prohibited to lift sensors through transmitters or rupture discs. The sensor does not require external support, and the flange itself is an omnidirectional support point.

HPC015: Provides flexible installation methods. The sensor can be installed online or fixed to the wall using an installation bracket. During installation, it is necessary to ensure that the flow arrow is consistent with the direction of the process fluid (the direction can also be reversed through software settings).

2.2 Installation of Core Processor and Electronic Components

Enhanced Core Processor: Can be installed on pipes or walls. For pipeline installation, two user provided U-bolts are required to secure the bracket. The core processor cover on the bracket is rotatable for easy orientation adjustment.

MVD DirectConnect intrinsic safety barrier: needs to be installed on a 35mm DIN rail. During installation, fasten the safety barrier onto the guide rail and secure it using an end clamping device. The safety barrier provides wiring terminals for the intrinsic safety side (connecting the core processor) and the non intrinsic safety side (connecting the remote host and power supply).

Extended electronic components: If the sensor is equipped with an extended electronic component, the extension tube needs to be installed on the sensor through tube. Ensure that the through tube and extension tube are clean and dry during operation, align the slots, and tighten with clamps to a torque of 1.47 to 2.03 Nm. The O-ring must remain in place to ensure sealing.

Electrical wiring and power connection

The wiring method varies depending on the type of electronic components in the transmitter.

3.1 4-wire cable wiring (applicable to split type transmitters)

A 4-wire cable needs to be connected between the core processor and the transmitter, including a pair of wires for DC power supply (red/black) and a pair of wires for RS-485 communication (white/green).

Cable preparation: If metal conduit is used, the drain wire should be kept floating at both ends of the conduit. If cable sealing joints are used, the shielding layer should be reliably terminated inside the joint. The cable sealing joints provided by Gaozhun have detailed stripping length requirements (NPT joint stripping 114mm, M20 joint stripping 108mm), and the shielding layer should be folded back onto the clamping insert to ensure 360 ° shielding continuity.

Wiring: Connect the prepared 4-wire cable to the core processor terminal. Reinstall and tighten the cover, with a torque of 1.13-1.47 Nm for the aluminum shell and at least 2.15 Nm for the stainless steel shell. Connect the other end to the transmitter terminal according to the transmitter manual.

3.2 9-wire cable wiring (suitable for traditional transmitters or split core processors)

The connection of 9-wire cables should refer to the "Guidelines for Preparation and Installation of High Precision 9-wire Flow Meter Cables". Insert the bare ends of various colored wire cores into the corresponding terminals of the junction box and tighten them. Ensure that the gasket is intact and tightly close all housing covers.

3.3 MVD DirectConnect Safety Barrier Wiring

This is a key step in the application of intrinsic safety explosion-proof. The wiring is divided into two parts:

Intrinsic safety side (to core processor):

Connect the RS-485 A/B line to safety barrier terminals 43 and 44.

Connect the VDC power supply (+/-) to safety barrier terminals 42 and 41.

The shielding wire of the core processor is suspended on the intrinsic safety side and not connected.

Non intrinsic safety side (to remote host and power supply):

Connect the RS-485 cable to terminals 13 and 14.

Connect the VDC power supply to terminals 11 and 12.

Grounding principle

Good grounding is the foundation of measurement accuracy and system safety. The instrument must be grounded according to the applicable standards on site, such as IEC 60079-14 or ISA 12.06.01.

Natural grounding: If the process pipeline is well grounded, the sensor will be automatically grounded through flange connection.

Mandatory grounding: If the pipeline is not grounded, a copper wire with a diameter of 2.08mm ² or larger must be used to directly connect the grounding screw on the sensor electronic component housing to the ground, and the grounding impedance should be less than 1 ohm.

Security protection and maintenance

5.1 Sensor shell blowing

In some applications, it may be necessary to blow the secondary housing of the sensor to remove moisture or combustible gases. Before operation, the process must be stopped or switched to manual control to prevent measurement interference.

Remove the blowing joint plug and wrap it with Teflon tape for future use.

Connect an inert gas source (nitrogen or argon), and adjust the inlet position according to the gas density (for heavy gases such as argon, the inlet should be at the bottom; for light gases such as nitrogen, the inlet should be at the top).

Inject gas to replace air, and the blowing pressure must be kept below 0.5 bar to prevent the pressure on the casing from affecting sensor calibration.

After the blowing is completed, immediately seal the inlet and outlet with plugs to ensure a tight seal to prevent air from being sucked back.

5.2 Explosion disc pressure relief protection

The HPC sensor housing is equipped with a rupture disc as a secondary pressure protection device. In extreme cases where the flow tube ruptures, the rupture disc will release high-pressure medium in a directed manner.

Installation direction: The installation direction of the sensor must ensure that the pressure relief path avoids operators and critical equipment.

Maintenance warning: Do not linger in the pressure relief area. Once the rupture disk ruptures, its seal becomes ineffective and the instrument must be stopped from use and replaced. If the blasting disc is removed, the shell will lose its secondary protection function and must be purged again.