Emerson Micro Motion 7827 Operation manual

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.