Emerson Micro Motion 7827 Manual de operación

High performance

industrial HFO

viscosity meter

High performance

viscosity sensor

High performance

viscosity meter

kits

7827

Product Data Sheet

PS-001217, Rev. C

April 2013

Micro Motion®7827 Digital Viscosity Meter

Micro Motion®viscosity meters are built to tackle the most demanding

process and control applications. Rugged and reliable direct insertion meters

with very low maintenance, they provide fully integrated “fit and forget”

viscosity measurement.

High accuracy viscosity and density measurement

• Multi-variable measurement of viscosity, density and temperature

• Unique direct insertion design in lengths up to 13 ft (4 m)

• Viscosity measurement up to 20,000 cP

Greatest installation flexibility

• Continuous, real-time measurement in pipelines, slipstreams and

tanks

•Superior diagnostics and parameter calculations including referred

viscosity and viscosity index

• Comprehensive communications and control capability

Superior reliability and safety

• Optimized design – insensitive to vibration, temperature, and

pressure variations

7827 / 7829

7829

Visconic

High performance

marine and power

HFO viscosity

meter

7829

Viscomaster

2Micro Motion 7827 Digital Viscosity Meter

Micro Motion®7827 Digital Viscosity Meter

The Micro Motion®7827 digital viscosity meter is an accurate measurement instrument used for continuous

real-time process control of liquid viscosity and density in pipeline, slipstream/bypass and tank installations.

About the 7827 Digital Viscosity Meter

The 7827 digital viscosity meter is used for

measurement or control of on-line process viscosity.

The meter is used in applications requiring

continuous on-line viscosity measurement in

pipelines and tanks. The 7827 meter is available as

a long-stemmed version for top mounting in open or

closed tanks.

The 7827 digital viscosity meter works with the

Micro Motion Model 7950 or Model 7951 signal

converter to directly measure on-line viscosity,

density, and temperature — allowing a true

measurement of dynamic and kinematic viscosity.

Additionally, parameters such as referred viscosity,

referred density, and viscosity index can also be

determined using the signal converters’ built-in

calculations. These calculations are based on API

and ASTM D341 standards.

With its multiple digital and analog communication

connections, PID control, and alarm contacts, the

combination of the 7827 meter with the 7950/7951

signal converter allows you to manage complex

process and control applications where on-line

measurements need to be referenced to laboratory

conditions.

Advantages

• Fully integrated “fit and forget” digital viscosity

and density measurement for monitoring and

control

• Continuous, fast response digital measurement

for closed loop control

• Measurements of viscosity and density at line

and reference conditions

• Operates at viscosities up to 20,000 cP

• No moving parts means virtually no

maintenance

• Integral Class B PT100 temperature sensor

• Hazardous-area approved (ATEX and CSA)

• Long-stemmed version is suitable for use on

open and closed tanks and available in stem

lengths up to 13 ft (4 m)

• Insensitive to vibration

• Direct insertion meter suitable for high-line

pressure

Contents

Typical applications . . . . . . . . . . . . . . . . . . . . . . . . 3

Typical industries . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Principle of operation. . . . . . . . . . . . . . . . . . . . . . . 3

Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Temperature specification . . . . . . . . . . . . . . . . . . . 5

Pressure ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Hazardous area classifications . . . . . . . . . . . . . . . 6

General classifications . . . . . . . . . . . . . . . . . . . . . 6

Materials of construction . . . . . . . . . . . . . . . . . . . . 7

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Ordering Information . . . . . . . . . . . . . . . . . . . . . . 12

Micro Motion 7827 Digital Viscosity Meter 3

Typical applications

• Heavy fuel oil (HFO) heater control to burners

and engines

• Lube oil viscosity control

• Interface detection in multi-product pipelines

• Mass flow, when used in conjunction with a

volumetric flow meter

• Product mixing and blending

Typical industries

• Oil and petrochemical

•Refining

•Power

• Heavy Fuel Oil (HFO) blending and bunkering

Principle of operation

The 7827 digital viscosity meter uses a vibrating

fork technology to measure density and viscosity. As

the liquid density changes, it affects the vibrating

mass of the meter. The change in vibrating mass

then affects the resonant frequency. Viscosity is a

function of the bandwidth, which is an indication of

the damping associated with the liquid.

The following figure illustrates how the 7827 meter

with a 7950/7951 signal converter uses the

resonant frequencies at point A (the lower

–3 db point) and at point B (the upper –3 db point)

to digitally calculate the density, bandwidth and

quality factor. These measurements then give

digitally determined values of fluid density and

viscosity.

Product 1

Product 2

Response

amplitude

Frequency (Hz)

Product 1 – Low Viscosity

Product 2 – High Viscosity

Bandwidth = Point B – Point A

Resonant Frequency = (Point A + Point B) / 2

Quality Factor = Resonant Frequency / Bandwidth

4Micro Motion 7827 Digital Viscosity Meter

Features

The 7827 digital viscosity meter works with the Model 7950 or Model 7951 signal converter to measure line

viscosity, density, and temperature; and, calculate referred viscosity and base density using ASTM and API

tables. Additionally, parameters such as °API and specific gravity also can be determined using the signal

converter’s built in calculations. Any of these parameters can be used to drive mA outputs from the signal

converter. See “7950/7951 signal converter features”.

Installation and application flexibility

The 7827 meter can be easily installed in a

slipstream/bypass, pipeline, open tank, pressurized

vessel, or flow-through sample chamber. The

availability of a choice of construction materials and

connections allow this meter to be used in a wide

range of applications.

Low maintenance required

Because the 7827 digital viscosity meter has no

moving parts, minimal maintenance is required,

leading to lower overall operating costs.

The vibrating forks are available with PFA coating to

assist self-cleaning. PFA is ideal for hydrocarbon

applications. Care should be taken if the PFA

coating is to be used in a corrosive application.

Please consult your local Micro Motion sales office.

Raw frequency output electronics

The 7827 digital viscosity meter is designed to

operate with the Micro Motion Model 7950 and

Model 7951 signal converters. See “7950/7951

signal converter features” below.

No field calibration required

The 7827 digital viscosity meter is factory-calibrated

and no field calibration is required. The calibration is

traceable to UK National Standards through the

Micro Motion onsite accredited laboratory.

Auto-ranging measurement

Each factory calibration is designed to achieve

maximum accuracy. The calibration measurements

are: 0.5 to 10 cP, 10 to 100 cP, 100 to 1000 cP, and

1000 to 12,500 cP. An auto-ranging facility is

provided for applications where the liquid viscosity

extends over one or more of the current operating

calibrated ranges.

Fluid characterization using viscosity

Because the 7827 meter is used with a 7950/7951

signal converter, complex measurements of liquid

viscosity at conditions away from line temperature

and pressure can be performed. Parameters such

as viscosity at reference temperature and viscosity

index are available.

7950/7951 signal converter features

Inputs from meter:

• Line viscosity (bandwidth)

• Line density (frequency)

• Temperature (PT100)

Typical 7950/7951 calculations:

• Referred kinematic viscosity

• Line dynamic/kinematic viscosity

• Referred density

• Specific gravity

• % concentration

7950/7951 outputs:

• Status

• Four 4–20 mA outputs (optional: 8)

• RS-232C/485

Micro Motion 7827 Digital Viscosity Meter 5

Performance

Temperature specification

Integral temperature sensor

Viscosity Calibrated Range 0.5 to 12,500 cP

Maximum Viscosity Operating Range 0.5 to 20,000 cP (using up to four calibrated ranges)

Viscosity Accuracy ±1% full scale of the operating calibrated range

Viscosity Repeatability ±0.5% of reading

Density Calibrated Range 0.65 to 1.25 g/cc 38 to 78 lb/ft3

Maximum Density Operating Range 0 to 3 g/cc 0 to 187.28 lb/ft3

Density Accuracy ±0.001 g/cc of reading ±0.0624 lb/ft3

Density Repeatability ±0.0001 g/cc ±0.0062 lb/ft3

Process Temperature Effect

(Corrected) (1)

(1) Temperature effect is the maximum measurement offset due to process fluid temperature changing away from the factory calibration

temperature.

0.0001 g/cc (per °C) 0.1 k/gm3(per °C)

Process

Ambient

Short-stem version

Long-stem version

–40 °F to +185 °F (–40 °C to +85 °C)

–58 °F to +392 °F (–50 °C to +200 °C)

–40 °F to +302 °F (–40 °C to +150 °C)

Technology 100 Ohms RTD (4 wire)

Accuracy PT100 BS1904 Class B, DIN 43760 Class B

6Micro Motion 7827 Digital Viscosity Meter

Pressure ratings

Hazardous area classifications

General classifications

Electromagnetic compatibility

All versions conform to the latest international standards for EMC, and are compliant with

EN 61326/IEC 61326.

Environment

• Weather rating: IP66

Maximum operating

pressure(1)

(1) Actual maximum operating pressures are limited by the process connection rating.

Short-stem version

Long-stem version

3000 psi (207 bar)

1450 psi (100 bar)

Test pressure Tested to 1.5 x the maximum operating pressure

PED compliance Outside the scope of European directive 97/23/EC on Pressure Equipment.

ATEX

ATEX-approved: Certification for use in Europe ATEX II2G Ex d IIC, T4

CSA C-US

CSA-approved: Certification for use in Canada and USA Class I, Division 1 Groups C & D, T4

Micro Motion 7827 Digital Viscosity Meter 7

Materials of construction

Weight

Electrical

Wetted parts Available in 316L Stainless steel, 304L Stainless steel, Alloy C22, Alloy B3, Alloy 400

Tine finish Standard, electro-polished, or PFA laminated(1) finishes available

(1) PFA is applied only to the tines for its anti-stick properties not for corrosion protection.

Electronics enclosure Short-stem version Sand cast low copper alloy

Polyurethane paint finish

Long-stem version Sand cast low copper alloy, or stainless steel

Polyurethane paint finish

Weight Short-stem version

Long-stem version

14.8 lb (6.7 kg) typical

Dependent on stem length (contact factory)

Power supply requirement

(from signal converter)

23 to 27 VDC, 50 mA

Outputs Viscosity and density

Temperature

Frequency

100 Ohms RTD (4 wire)

Electrical connection Screw terminal, cable entry to suit ½” NPT gland (20 mm adaptor available)

8Micro Motion 7827 Digital Viscosity Meter

Dimensions

7827 Short Stem

Cone-seat connection details

Flange connection details

Dimensions in inches (mm)

4.9 (125.4)

5.5 (140)

→4.3 (109)

Mounting to suit 1.5″Swagelok or

similar cone

1.2

(31)

1/2•NPT both sides

4.8 (121)

0.5

(12)

→1.38 (35)

Dimensions in inches (mm)

4.9 (125.4)

5.5 (140)

→4.3 (109)

1.2

(31)

1/2•NPT both sides

4.8 (121)

0.5

(12)

→1.38 (35)

Micro Motion 7827 Digital Viscosity Meter 9

7827 Long Stem

Open-tank connection (cast housing)

Open-tank connection (stainless steel housing)

→4.29 (109)

5.75 (146)

5.71 (145)

4.53 (115)

Pipe must be securely

clamped in at least two

places along this length.

Electronic housing

External Earth

connector

Lower nodal mass

Long stem 1.5•SCH 80 tube Vibrating element

Dimensions in inches (mm) Mounting hardware is customer specific, and is not supplied.

→1.38 (35)

19.68 (500)

Stem lengths up to 13 ft (4 m) are available as an

ETO purchase.

→4.75 (120)

6.89 (175)

5.71 (145)

5.04 (128)

Pipe must be securely

clamped in at least two

places along this length.

Amplifier housing

External Earth

screw

Lower nodal mass

Long stem 1.5•SCH 80 tube Vibrating element

Dimensions in inches (mm) Mounting hardware is customer specific, and is not supplied.

Upper nodal mass

Cover lock screw

M4 x 5 ST.STL -

Kept captive by

data label

NPT

→1.38 (35)

19.68 (500)

Stem lengths up to 13 ft (4 m) are available as an

ETO purchase.

10 Micro Motion 7827 Digital Viscosity Meter

7827 Long Stem continued

Closed-tank connection (cast housing)

Closed-tank connection (stainless steel housing)

→4.29 (109)

11.4 (290)

4.53 (115)

Connection to pipeline (Zone 0 area) by means

of a standardized industry flange (for example,

DIN, ANSI, BS, or JIS Limit ANSI 1500

equivalent)

Electronic housing

External Earth

connector

Lower nodal mass

Long stem 1.5•SCH 80 tube Vibrating element

Dimensions in inches (mm)

5.5 (140)

5.7 (145)

NPT

→1.38 (35)

19.68 (500)

Stem lengths up to 13 ft (4 m) are available as an

ETO purchase.

Connection to pipeline (Zone 0 area) by means

of a standardized industry flange (for example,

DIN, ANSI, BS, or JIS Limit ANSI 1500

equivalent)

5.71 (145)

5.5 (140)

Amplifier housing

External Earth

screw

Lower nodal mass

Long stem 1.5•SCH 80 tube Vibrating element

→4.7 (120)

Upper nodal mass

Cover lock screw

M4 x 5 ST.STL -

Kept captive by

data label

Dimensions in inches (mm)

5 (128)

11.4 (290)

NPT

→1.38 (35)

19.68 (500)

Stem lengths up to 13 ft (4 m) are available as an

ETO purchase.

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