User Guide
00825-0100-8785, Rev AA
November 2019
Rosemount™ 8785 Calibration Standard
For Rosemount 8782 Transmitters
User Guide November 2019
1 Safety
WARNING
• Failure to follow instructions in this guide could result in serious injury or
death.
• Instructions in this guide are for use by qualified personnel only. Do not
perform any servicing other than that contained in this guide, unless
qualified.
• The Calibration Standard cannot be used in a hazardous location nor can
it be connected to transmitters that are operating in a hazardous
location. A safe work permit shall be issued prior to connecting the
Calibration Standard to an installed transmitter in a hazardous location.
The safe work permit shall ensure that the user has taken the necessary
steps to declassify the area as defined by the authority having
jurisdiction for the installed transmitter.
• The Calibration Standard uses components that can be damaged by
electrostatic discharge (ESD). When handling, care must be taken so that
the device is not damaged. The following precaution should be taken:
Always discharge yourself by touching a grounded bare metal surface
before handling any ESD-sensitive electronic device.
• The user shall ensure that the Calibration Standard is properly grounded
by connecting the black coil drive wire to coil shield terminal number 3
on the transmitter.
2 Rosemount 8785 Calibration Stand User Guide
November 2019 User Guide
2 Introduction
The Rosemount 8785 Calibration Standard is a high-precision instrument
exclusively designed for use with the Rosemount 8782 Slurry Magnetic Flow
Meter Transmitter. It is a necessary tool for users to verify calibration of the
8782 Transmitter and to perform the digital trim calibration of the 8782
Transmitter.
2.1 Return policy
Emerson procedures must be followed when returning equipment. These
procedures ensure legal compliance with government transportation
agencies and help provide a safe working environment for Emerson
employees. Failure to follow Emerson procedures will result in your
equipment being refused delivery.
User Guide 3
User Guide November 2019
2.2 Emerson Flow customer service
Email:
• Worldwide: flow.support@emerson.com
• Asia-Pacific: APflow.support@emerson.com
Telephone:
North and South America Europe and Middle East Asia Pacific
United States 800 522 6277 U.K. 0870 240
Canada +1 303 527
5200
Mexico +41 (0) 41
7686 111
Argentina +54 11 4837
7000
Brazil +55 15 3413
8000
Venezuela +58 26 1731
3446
The
Netherlands
France 0800 917 901 India 800 440 1468
Germany 0800 182
Italy 8008 77334 China +86 21 2892
Central &
Eastern
Russia/CIS +7 495 995
Egypt 0800 000
Oman 800 70101 Thailand 001 800 441
Qatar 431 0044 Malaysia 800 814 008
Kuwait 663 299 01
South Africa 800 991 390
Saudi Arabia 800 844 9564
UAE 800 0444
1978
+31 (0) 704
136 666
5347
+41 (0) 41
7686 111
9559
0015
0684
Australia 800 158 727
New Zealand 099 128 804
Pakistan 888 550 2682
9000
Japan +81 3 5769
6803
South Korea +82 2 3438
4600
Singapore +65 6 777
8211
6426
4 Rosemount 8785 Calibration Stand User Guide
November 2019 User Guide
3 Calibration Standard connections to
transmitter
Figure 3-1: Wire connections from Calibration Standard to transmitter
MODEL 8785
CALIBRATION STANDARD
COIL
CURRENT ON
COIL DRIVE
FOR USE WITH 8782 ONLY
WARNING
To prevent risk of electrical shock: The user shall ensure that the Calibration
Standard is properly grounded by connecting the correct wire to coil shield
terminal number 3 on the transmitter.
Table 3-1: Calibration Standard wiring to transmitter terminals
8785 Calibration Standard 8782 Transmitter terminal
Coil drive Red 1
Blue 2
Black 3
Electrode Drain Drain
Black 17
Yellow 18
White 19
User Guide 5
User Guide November 2019
3.1 Making cable connections
1. Insert the gray cable end into the gray receptacle marked
"ELECTRODE SIGNAL" and the blue cable end into the blue receptacle
marked "COIL DRIVE" on the calibration standard.
2. Twist the connectors clockwise to lock them into place.
When the connector is fully locked into place, the lock symbol is
visible on the calibration standard face plate.
3. Make the cable connections to the transmitter as indicated in Table
3-1.
6 Rosemount 8785 Calibration Stand User Guide
November 2019 User Guide
4 Digital trim
LOI menu path Diagnostics → Trims → Digital Trim
Digital trim is calibration of the transmitter. It is first performed at the
factory with transmitters before they are shipped. It is only necessary for a
customer to perform the digital trim when inaccurate measurement is
observed or suspected.
Complete these steps to identify if a digital trim is needed, and then perform
and verify it, when necessary.
NOTICE
To avoid electrical damage to equipment, use the 8785 Calibration Standard
only with the Rosemount 8782 transmitter.
1. Set the loop to manual (if necessary).
2. Record the current transmitter configuration settings for Calibration
Number, Units, PV URV, PV LRV, and Coil Drive Frequency.
3. Change the following transmitter configuration settings:
• Calibration Number: 1000075010000000
• Units-ft/s
• PV URV-20mA = 30.00 ft/s
• PV LRV-4mA = 0 ft/s
• Coil Drive Frequency- Low Frequency setting
Note
The instructions for changing the calibration number, units, PV URV,
PV LRV, and coil drive frequency can be found in the product
reference manual.
4. Power down the transmitter.
5. Connect the transmitter to the Calibration Standard.
See Calibration Standard connections to transmitter.
6. Power up the transmitter with the Calibration Standard connected.
7. Set the Calibration Standard to the 30 ft/s (9.1 m/s) setting.
8. Wait 30 minutes for accurate flow rate measurement.
The electronics need 30 minutes to warm up and stabilize after the
Calibration Standard is connected, oriented, and situated.
User Guide 7
User Guide November 2019
9. Read the flow rate.
The flow rate reading after warm-up should be between 29.97 (9.1
m/s) and 30.03 ft/s (9.2 m/s).
10. If the reading is within the range, digital trim is not necessary.
a) Power down the transmitter.
b) Disconnect the Calibration Standard.
c) Power up the transmitter.
d) Return the transmitter to the original configuration
parameters recorded in Step 2.
e) Return the flow meter into service.
11. If the reading is not within this range, use the LOI or other
configuration tool perform a digital trim.
Performing the digital trim means simply executing the Digital Trim
function and waiting for it to complete.
• It takes about 90 seconds to complete. No transmitter
adjustments are required.
• You must use a Rosemount 8785 Calibration Standard to
complete this procedure. Attempting a digital trim without a
Rosemount 8785 Calibration Standard may result in an
inaccurate transmitter or a “DIGITAL TRIM FAILURE” message.
12. After completing the digital trim, verify the calibration at each flow
rate setting on the Calibration Standard:
• Use the selector switch on the Calibration Standard to change the
flow rate.
• Use the transmitter LOI or other configuration tool to read the
flow measurement.
• The flow rate reading should be within ±0.1% of the simulated
flow rate. For example, at 30 ft/s (9.14 m/s), the reading should
be between 29.97 ft/s and 30.03 ft/s (between 9.13 m/s and 9.15
m/s).
• If any of the verified values are not within ±0.1% of the simulated
flow rate, replace the transmitter and/or contact an Emerson
Flow representative for service (see back page).
Note
Only labeled and marked dial positions are used. The dial may turn to
other positions but will not provide meaningful outputs.
13. After successful verification:
8 Rosemount 8785 Calibration Stand User Guide
November 2019 User Guide
a) Power down the transmitter.
b) Disconnect the Calibration Standard.
c) Power up the transmitter.
d) Return the transmitter to the original configuration
parameters recorded in Step 2.
e) Return the flow meter into service.
User Guide 9
User Guide November 2019
5 Product Specifications
5.1 Functional specifications
Ambient temperature limits
• Operating: +40 °F to 104 °F (+5 °C to 40 °C)
• Storage: –40 °F to 140 °F (–40 °C to 60°C)
Humidity Limits
0 to 95% relative humidity up to 13,000 ft (4000 m)
5.2 Performance specifications
Accuracy
• ±0.05% of rate at 30 ft/s
• ±0.10% of rate at 10 ft/s and 3 ft/s
Warm-up Time
5 minutes minimum; 30 minutes for best accuracy
Ambient Temperature Effect
< 0.015% of rate per 10 °F (< 0.027% per 10 °C)
Humidity Effect
• No effect from 0 to 60% relative humidity
• < 0.10% of rate from 60 to 95% relative humidity
5.3
10 Rosemount 8785 Calibration Stand User Guide
Physical specifications
Electrical connections
Electrical connections are compatible with Model 8782 terminal blocks.
Electrical connections are not compatible with other terminal blocks.
Orientation
Must be steady with all four feet firmly resting on a flat surface. Warm up
time begins after the Calibration Standard is settled.
Materials of construction
Enclosure
Paint Epoxy polyester
Extruded aluminum and 316 stainless
steel
November 2019 User Guide
Weight
Approximately 10 lb (4.5 kg).
User Guide 11
User Guide November 2019
6 Troubleshooting
6.1 General troubleshooting
If the Calibration Standard does not seem to be working at all:
• Verify connections have been made properly, see Calibration Standard
connections to transmitter.
• Inspect cables for wear and damage. Replacement cables can be
ordered, see Replacement cables.
• Verify transmitter power supply and wiring, and correct if needed.
If the heat sink fins on the back of the Calibration Standard become bent or
damaged, the Calibration Standard could overheat, which would affect its
performance.
If the Calibration Standard appears to be working properly, but you suspect
an inaccurate flow signal not caused by a faulty transmitter, the Calibration
Standard may need to be calibrated at the factory. See Service.
12 Rosemount 8785 Calibration Stand User Guide
November 2019 User Guide
7 Maintenance
7.1 Service
Replacement cables can be ordered and replaced in the field, see
Replacement cables.
External and internal parts replacement and service cannot be performed in
the field. The calibrator must be returned to the factory for these services.
The calibrator should itself be calibrated at the factory at least once per year,
and any time you suspect that it is no longer producing an accurate flow
signal.
See Emerson Flow customer service for service contact information.
7.2 Replacement cables
Table 7-1: Replacement cables part number
Part name Part number
Cables (pair) 08785-0507
User Guide 13
User Guide November 2019
8 Product Certifications
For detailed approval certification information and installation drawings,
please see the appropriate document listed below:
• Document number 00825-MA00-0009: Rosemount 8782 and MS
Approval Document - Class Division
• Document number 00825-MA00-0010: Rosemount 8782 and MS
Approval Document - IECEx and ATEX
• Document number 00825-MA00-0011: Rosemount 8782 and MS
Approval Document - North America Zone
• Document number 00825-MA00-0012: Rosemount 8785 Approval
Document
• Document number 00825-MA00-0013: Rosemount 8782 and MS
Approval Document - EAC EX
14 Rosemount 8785 Calibration Stand User Guide
November 2019 User Guide
User Guide 15
*00825-0100-8785*
00825-0100-8785, Rev. AA
User Guide
November 2019
Emerson Automation Solutions USA
7070 Winchester Circle
Boulder, Colorado USA 80301
T +1 303-527-5200
T +1 800-522-6277
F +1 303-530-8459
www.emerson.com
Emerson Automation Solutions Europe
Neonstraat 1
6718 WX Ede
The Netherlands
T +31 (0) 70 413 6666
F +31 (0) 318 495 556
www.micromotion.nl
©
2019 Rosemount, Inc. All rights reserved.
The Emerson and Rosemount logos are trademarks and service marks of
Emerson Electric Co. All other marks are property of their respective
owners.
Emerson Automation Solutions Asia
1 Pandan Crescent
Singapore 128461
Republic of Singapore
T +65 6363-7766
F +65 6770-8003
Emerson Automation Solutions United
Kingdom
Emerson Process Management Limited
Horsfield Way
Bredbury Industrial Estate
Stockport SK6 2SU U.K.
T +44 0870 240 1978
F +44 0800 966 181
Loading...