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7526A Precision Temperature/Pressure Process Calibrator. Introducing the 7526A Precision Process Calibrator. Value proposition Typical applications Key features & benefits Product overview Product features Summary specs Options & accessories.
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Introducing the7526A Precision Process Calibrator • Value proposition • Typical applications • Key features & benefits • Product overview • Product features • Summary specs • Options & accessories A “best fit” for process instrumentation calibration
7526A Value Proposition • Balances precision and versatility with cost • The 7526A is less expensive than high-end multi-product calibrators, yet more precise and versatile than handheld field calibrators • 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.
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)
7526A Product Overview (Left Half) DC voltage output terminals 0 Vdc to 100 Vdc Accuracy: 30 ppm (+3 μV) DC current output terminals 0 mA to 100 mA Accuracy: 50 ppm RTD/Ω output terminals (two-wire) 5 Ω to 4 kΩ, Accuracy: ± 0.05 ºC, –200 to 630 ºC Four-wire RTD/Ω input terminals Accuracy: ±0.02 ºC Pt 385, 100 Ω, –80 to 100 ºC Isolated pressure module input Accepts Fluke 700 & 525A series pressure modules Thermocouple input/output terminal Accuracy: ± 0.1 ºC –100 to 800 ºC (type K)
7526A Product Overview (Right Half) Isolated input controls dc voltage/current Switch test mode 24 Vdc power supply 250 Ω HART resistor Pressure input mode • Numeric and secondary function keys Cursor controls • Input/Output Function Keys • dc voltage/current • TC/RTD • Pressure mode • Unit type • Stby/Operate • 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
7526A Product Overview (Rear Panel) Power line voltage selector and fuse compartment Power switch AC power inlet 120/240 AC Service port Chassis ground GPIB IEEE-488 RS-232 Port
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
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 ↓ ∿↓ 250 < R < 1100 Computer HART communicator ∿ • LOOP PWR • Turns on an internal 24 Vdc power supply in series with the current measurement circuit • Used to power 4 – 20 mA transmitters
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
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
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
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
Convert Spec in PPM to % Reading Convert a spec in ppm to % error of reading
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
