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7526A Precision Temperature/Pressure
Process Calibrator
Introducing the
7526A Precision Process Calibrator
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Value proposition
Typical applications
Key features & benefits
Product overview
Product features
Summary specs
Options & accessories
©2012 Fluke Corporation
A “best fit” for process instrumentation calibration
Fluke 7526A Precision Process Calibrator
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7526A Value Proposition
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Balances precision and versatility with cost
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The 7526A is less expensive than high-end
multi-product calibrators, yet more precise
and versatile than handheld field calibrators
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Calibrates wide ranging workload
7526A
Versatility, precision & value
The 7526A offers an isolated measurement channel allowing it
to precisely, and simultaneously, source and measure
temperature & electrical parameters. Pressure measurement
can be viewed in both displays in different units of measure.
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Typical Applications
Industry
Applications
Calibration workload
Pharmaceutical/
Bio-tech
Monitor temp/pressure
process, monitor
freezers/ovens/incubators,
freeze-drying, SIP
Temp/pressure transmitter, pressure
gauges, handheld calibrator, temp
readout, chart recorder
Food
Monitor process temp, food
dryers, monitor cold storage,
monitor refrigeration
equipment, SIP
Temp/pressure transmitter, temp
readout, limit alarm, PID controller
Oil & Gas
Monitor pipeline provers,
custody transfer
Temp/pressure transmitter, pressure
gauges, flow transmitter
Chemicals
Monitor temp/pressure
reaction conditions,
refrigeration, boilers
Temp/pressure transmitter, limit alarms,
pressure gauges
Electronic Equipment
Manufacturer
Manufacturing electronic
devices
Automatic test station
3rd Party Calibration
Lab
Service industries listed
above
All of the above
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Key Features & Benefits
Feature
Benefit
Improved
thermocouple
accuracy
Can calibrate Documenting Process
Calibrators (2:1 TUR) and nearly all handheld
temperature & pressure calibrators
Switch test
(unique to 7526A)
Increased workload. Not every temperature
source, such as a drywell, includes a switchhold function. Pressure sources do not.
Simultaneous source
and measure
Calibrate more DUTs in less time. See results
of an adjustment immediately.
MET/CAL®
Calibration Software
compatible
Write automated procedures, create reports.
Value
Costs less than a DPC, highly versatile,
precise but competitively priced.
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Product Overview
• Precision Temperature/Pressure
Process Calibrator
• Sources and measures:
– Thermocouples (13 types)
– RTDs (9 types)
– Thermistors (YSI-400)
– Voltage (0 to 100 Vdc)
– Resistance (0 Ω to 4 kΩ)
– Current (100 mA output / 50 mA input)
• Measure only:
– Pressure (0 to 700 bar / 10,000 psi)
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Product Overview (Left Half)
DC voltage output terminals
0 Vdc to 100 Vdc
Accuracy: 30 ppm (+3 μV)
Four-wire RTD/Ω input
terminals
Accuracy: ±0.02 ºC
Pt 385, 100 Ω, –80 to 100 ºC
©2012 Fluke Corporation
DC current output terminals
0 mA to 100 mA
Accuracy: 50 ppm
Isolated pressure
module input
Accepts Fluke 700 & 525A
series pressure modules
Fluke 7526A Precision Process Calibrator
RTD/Ω output terminals (two-wire)
5 Ω to 4 kΩ,
Accuracy: ± 0.05 ºC, –200 to 630 ºC
Thermocouple
input/output terminal
Accuracy: ± 0.1 ºC
–100 to 800 ºC (type K)
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7526A Product Overview (Right Half)
Numeric and secondary
function keys
Input/Output Function Keys
dc voltage/current
TC/RTD
Pressure mode
Unit type
Stby/Operate
©2012 Fluke Corporation
Cursor controls
Isolated input controls
dc voltage/current
Switch test mode
24 Vdc power supply
250 Ω HART resistor
Pressure input mode
Isolated input terminals
Allows simultaneous source and measure
dc voltage (0 to 100 V)
dc current measurement (0 to 50 mA)
Switch-test input
24 V dc loop power supply
Fluke 7526A Precision Process Calibrator
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7526A Product Overview (Rear Panel)
Power switch
RS-232 Port
©2012 Fluke Corporation
GPIB IEEE-488
Service port
Power line voltage
selector and fuse
compartment
Chassis ground
Fluke 7526A Precision Process Calibrator
AC power inlet
120/240 AC
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7526A Product Features
STBY/OPR
• In Standby mode, changes to the output
value are not applied until you select the
Operate mode
• In Operate mode, each change to the
output value is applied immediately
• Voltages more than 30 V are not applied.
The mode automatically reverts to Standby
for safety
• In Thermocouple mode, move through the
thermocouple types (including millivolts)
• In RTD/Ohms mode, move through the
RTD types (including ohms)
• In Pressure mode, move through the
pressure units
Select a secondary function from the numeric
keypad
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Product Features
HART
• Enables a 250 Ω internal resistor
• Without the loop resistance in place, the DC power
supply would “short out” the communicator’s AC voltage
signal
• The presence of a loop resistor in the circuit prevents the
DC power supply from “loading” the AC voltage signal by
the communicator.
• Some minimum loop impedance is needed so that the
HART signal can be ‘seen’ or ‘read’ by a HART master,
like a HART communicator or HART modem.
HART
transmitter
Power
supply
∿↓
↓
LOOP PWR
• Turns on an internal 24 Vdc power supply in series
with the current measurement circuit
∿
250 < R < 1100
Computer
• Used to power 4 – 20 mA transmitters
HART communicator
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Product Features
RTD and Ohms Measure/Source
• Measures & Sources all common RTD types
• Stores CVD coefficients for up to five RTDs
• Stores coefficients for one SPRT (ITS-90)
• Resistance from 0 Ω to 4 kΩ.
RTD types:
• Pt 385 100 Ω, 200 Ω, 500 Ω, 1000 Ω
• Pt 3926 100 Ω
• Pt 3916 (JIS) 100 Ω
• Ni120 120 Ω
• Cu 427 (Minco) 10 Ω
• YSI 400 thermistor
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Product Features
Thermocouple (TC) Measure/Source
Measure & sources all common thermocouple types and
basic millivolts from -10.0 to 75.0 mV
Thermocouple types: B, C, E, J, K, L, N, R, S, T, U, XK, BP
Pressure Measure
• The isolated pressure display uses the same physical
pressure connector as the primary display
• Both displays can show pressure at the same time
• The same source can be shown in different pressure units
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Pressure Modules
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Product Features
Preset setpoints
Nine preset output setpoints can be stored and recalled for
each of these output modes:
• Voltage
• Current
• Each thermocouple type (including mV)
• Each RTD type (includes each of the five custom curves)
Switch Test Mode
• When in Switch Test mode the Calibrator can
sense a contact transition (closed or opened)
• At the time of the transition, the Calibrator
records the value and units shown on the
primary display
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Product Features
Remote Interface
• RS-232 or GPIB (IEEE-488) can control 7526A from
a PC
• A serial to USB adapter cable is included as
standard with the 7526A
• Individual commands can be typed into terminal
emulator software
• MET/CAL compatible – write automated procedures
and generate calibration reports
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Workload
Companies
Rosemount
Moore industries
Wilkerson Instruments
M-Systems
API
Omega
Newport
Yokogawa
Euthrotherm
Westin
Analog Devices
Action Instruments
CR Magnetics
©2012 Fluke Corporation
Product Types
Two wire transmitters
I/P converters
P/I converters
Fourwire conditioners
Pressure switches
Pressure Gauges
Limit alarms
Panel meters
PID controllers
Thermometers
Isolators
DMMs
Chart Recorders
Fluke 7526A Precision Process Calibrator
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7526A Summary Specs
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Summary Specs (cont.)
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Convert Spec in PPM to % Reading
Convert a spec in ppm to % error of reading
A part per million simply means a fraction of 1/1,000,000
Accuracy is expressed as ppm of reading + floor offset
Assume we are using the 0 to 10 V range and reading 10 V
Example:
1. Divide accuracy spec (30 ppm) by 1,000,000
=30 ppm/1,000,000 = 0.00003
2. Multiply reading (10 V) by result above
=10 V x 0.00003 = 0.0003 V
3. Add floor offset to voltage error (100 µV in this case)
=0.0003 V + 0.0001 V = 0.0004
4. Add combined voltage error to reading
= 0.0004 ± 10 V = 10.0004 or 9.9996
5. Divide result by reading
= 10.004 V / 10 V = ± 0.004%
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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7526A Standard & Optional Equipment
Included in the box:
• 7526A Precision Process Calibrator
• Users Manual CD-ROM
• Getting Started
• AC Mains Cord
• Thermocouple Shorting Jumper
• NIST Traceable Calibration Report
• USB to Serial Adapter Cable
Options and accessories:
• 5520A-525A Leads kit
• Y7526A Rack Mount kit
• Fluke 700 and 525A-P series pressure modules
• MET/CAL with 7526A Function Select Code (FSC)
• MET/CAL 7526A calibration procedure
• Optional accredited calibration
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Questions
?
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Appendix – P/I Transmitter
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Appendix – I/P Transmitter
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Appendix – V/I Transmitter
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Appendix – RTD Transmitter
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Appendix – TC Transmitter
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Appendix – RTD Indicator
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Appendix – Temperature Switch Test
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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Appendix – Pressure Switch Test
©2012 Fluke Corporation
Fluke 7526A Precision Process Calibrator
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