Model 525
T/C & RTD Dual Calibrator
Practical Instrument Electronics
Direct Temperature Input/Output
Read or Source in °C or °F for your T/C type and
RTD curves
8 Standard T/C Types Available
Types J, K, E, T, R, S, B, N and mV
Cold Junction Compensated
8 RTD Curves Available
Platinum, Copper, Nickel & Ω
Custom types and ranges are available
Auto Stepping
Accurate to ±0.2 °C (±0.4 °F) with 0.1° Resolution
Millivolt accuracy of ±(0.008 % + 0.006 mV)
Resistance accuracy of ±(0.015 % + 0.05) Ω
Guaranteed to Work with ALL Pulsed Instruments
Works with wide variety of transmitters including popular
Rosemount and Honeywell Models
Compatible with devices using pulsed excitation currents
Including PLCs, DCS Recorders and all others
IN RTD mode Automatic Detection of 2, 3, or 4 wire
Connections
No buttons or switches required, 2W, 3W, or 4W indicator is
automatic
A valuable troubleshooting tool
EZ-Dial Knob
Easily adjust output by 0.1 °
Pressing down and turning will select a faster dialing speed
Description
With Auto Stepping
Datasheet
Features
Z-Check Switch
User selectable EZ-Check for 0 % and 100 % span
adjustment
Store new EZ-Check values by pressing the EZ-Dial knob
Recall stored minimum and maximum readings
Uses a standard 9V Alkaline Battery
Superior battery life of 45 hours under typical continuous
usage
Easy access to battery compartment
Lightweight and Rugged with a Solid Feel
Small, tough and protected to 60 V
The Practical Instrument Electronics Model 525 T/C & RTD calibrator provides direct temperature calibration to all types of
instruments such as transmitters, recorders, controllers, alarms, data acquisition, and computer systems. Also, he Model 525 reads
RTD & T/C outputs and displays temperature. It is compatible with pulsed systems and transmitters (like the Rosemount 3144) 2, 3,
or 4 wire connections are detected automatically. The Model 525 is a superior replacement for decade boxes, and eliminates the
need for lugging around large equipment and the possibility of misreading RTD tables.
Use the EZ-Check Switch to quickly switch between three stored temperatures, Ω/mV outputs. It’s easy to customize these values
to your application. In read mode, the EZ-Check Switch recalls minimum and maximum readings. Store/Clear memory with a press
of the EZ-Dial Knob.
The Practical Instrument Electronics Model 525 offers the highest performance and functions in its class by exceeding the accuracy
and functions of many higher priced T/C & RTD calibrators. It is a low cost solution for checkout and calibration of all T/C & RTD
instruments in the field, shop or control room. Contact Practical Instruments Electronics for custom T/C & RTD curves, ranges, or
special requirements not provided by the Model 525.
Practical Instrument Electronics, Inc. Copyright 2003. All rights reserved.
525-9001 2/28/05
1-4
Model 525 Datasheet
Specifications
General Specifications:
Unless otherwise indicated all specifications are rated from a nominal 23 °C, 70 % RH for 1 year from calibration.
Temperature Range -25 to 60 °C (-10 to 140 °F)
Relative Humidity Range 10 % ≤RH ≤90 % (0 to 35 °C), Non-condensing
10 % ≤RH≤ 70 % (35 to 60 °C), Non-condensing
Overall Size 4.9 X 3.15 X 1.82 inches (125.5 X 80 X 46.2 mm)
Overall Weight (including 9V battery) 7.2 oz (204 grams)
Battery 9V Alkaline provides 45 hours of continuous use
Miscellaneous Low battery indication with nominal 1 hour of operation left
Overload protected to 60 volts for 30 seconds or less
High-contrast graphic liquid crystal display with 0.357” (9.07 mm) high digits
Accuracy:
Millivolt Accuracy ±(0.008 % of mV Setting + 0.006 mV)
Temperature Coefficient of mV Source 50 ppm/°C of output range
Cold Junction Calibration Accuracy ±0.1 °C (0.2 °F)
Cold Junction Sensor Temperature Coefficient ±0.025 °/° in ambient temperature (°C or °F)
General Temperature Accuracy ±(0.008 % of mV setting + 0.006 mV) ± 0.1 °C (0.2 °F)
Resolution 0.1 °C or 0.1 °F
Source Thermocouple Specifications:
Output Range -13.000 to +80.000 mV
Output Noise ±5 µV pp from 0.1 Hz to 10 Hz
Output Impedance
Source Current < 8 mA
Read Thermocouple Specifications:
Input Noise < ±1 LSD from 0.1 Hz to 10 Hz
Input Impedance
Open T/C Test Pulse < 1 uA for 300 ms
Open T/C Response Time < 3 seconds
Open T/C Threshold
RTD Simulation Specifications:
Allowable Excitation Current
for accuracies below 100µA add
Pulsed Excitation Current Compatibility DC to 0.01 second pulse widths
RTD Read Specifications:
Excitation Current 1 mA nominal
Available Options:
Carrying Case Part Number: 020-0201 without logo
020-205 with logo
0.2 Ω (200 nV/uA)
> 1 MΩ
10 kΩ nominal
100 µA to 10.2 mA, steady or pulsed/intermittent/smart
±10µV/Excitation Current (units are in Ω)
Practical Instrument Electronics, Inc. Copyright 2003. All rights reserved.
525-9001 2/28/05
2-4
Model 525 Datasheet
RTD Temperature Accuracy
The following charts give worst-case temperature accuracy based on stated resistance accuracy of ±(0.015 % + 0.05) Ω.
Pt100 TCR=0.00385
0.4
0.3
0.2
Error °C
0.1
-200 0 200 400 600 800
-200 to 850 °C
Temperature °C
Pt10 0 TC R=0.0 039 16
0.4
0.3
0.2
Error °C
0.1
-200 0 200 400 600 80 0
-200 to 850 °C
Temperat ure °C
Cu10 TCR=0.00427
1.4
1.35
1.3
Error °C
1.25
1.2
-200 -100 0 100 200 300
-200 to 260 °C
Temperature °C
Pt100 TCR=0.003 902
0.4
0.3
0.2
Error °C
0.1
-200 0 200 400 600 800
0.4
-200 to 850 °C
Temperature ° C
Pt100 TCR=0.003 926
-20 0 to 850 °C
0.3
0.2
Error °C
0.1
-200 0 200 400 600 800
Temperature °C
Cu50 TCR=0.00428
0.5
0.4
0.3
0.2
Error °C
0.1
0
-50 0 50 100 150
-50 to 150 °C
Temperature °C
Ni110 TCR=0.00530
0.16
0.14
0.12
Error °C
0.1
0.08
-100 0 100 200 300 400
-100 to 300 °C
Temperature °C
0.1
0.09
Error °C
0.08
0.07
-100 -50 0 50 100 150 200 250 300
-80 to 260 °C
Temperat ure °C
Temperature Accuracy
The following charts give worst-case temperature accuracy based on stated millivolt accuracy of ±(0.008 % of reading + 0.006mV).
Temperature is uncompensated on the horizontal axis, referenced to 0 °C. Cold Junction calibration accuracy of 0.1 °C is not included
in the temperature error.
Ni120 TCR=0.00672
TYPE B
594 to 1820 °C
1.2
1
0.8
0.6
0.4
Error °C
0.2
0
500
700
900
1100
1300
1500
1700
Temperature °C
1900
1.4
1.2
1
0.8
0.6
Error °C
0.4
0.2
0
-400
-260 to 1000 °C
0
-200
TYPE E
200
400
Temperature °C
TYPE J
-210 to 1200 °C
0.4
0.3
0.2
Error °C
0.1
0
600
800
1000
1200
0
200
400
600
-400
-200
Temperature °C
800
1000
1200
1400
Practical Instrument Electronics, Inc. Copyright 2003. All rights reserved.
525-9001 2/28/05
3-4
Model 525 Datasheet
-245 to 1372 °C
TYPE K
1.2
1
0.8
0.6
0.4
Error °C
0.2
0
1.2
1
0.8
0.6
0.4
Error °C
0.2
0
0
200
400
600
-400
-200
0
200
Temperature °C
TYPE S
21 to 1768 °C
400
600
Temperature °C
800
1000
1200
1400
1600
800
1000
1200
1400
1600
1800
2000
1.2
1
0.8
0.6
0.4
Error °C
0.2
0
-400
-200
1.2
1
0.8
0.6
0.4
Error °C
0.2
0
-300
-229 to 1300 °C
0
-251 to 400 °C
-200
-100
TYPE N
200
400
Temperature °C
TYPE T
0
100
Temperature °C
1.2
1
0.8
0.6
0.4
Error °C
0.2
0
0
600
800
1000
1200
1400
200
300
400
500
Other Products Available:
RTD Source (Single Type/1° resolution) Model 510
RTD Source (7 Types, Ω/0.1° resolution)
Model 511
Pt100: α=1.3850, 1.3902, 1.3916, 1.3926, Cu10: α=1.427
Ni110: α=1.530, Ni120: α=1.672
RTD Calibrator (Source/Read 7 Types, Ω /0.1° resolution) Model 512
RTD Calibrator (Source, Read & Auto Stepping 8 Types, Ω /0.1° resolution) Model 512S
T/C Source (Single Type/1° resolution) Model 520
T/C Source (8 Types, mV/0.1° resolution)
Model 521
B, E, J, K, N, R, S, T, mV
T/C Calibrator (Source/Read 8 Types, mV /0.1° resolution)
Model 512
B, E, J, K, N, R, S, T, mV
4-20 Milliamp Loop Calibrator Model 530
Pocket-Mate Milliamp Calibrator Model 531
4-20 Milliamp Loop Calibrator with Diagnostic Model 532
4-20/10-50 Dual Range Loop Calibrator Model 535
Frequency Read & Source with Totalizer Model 541
200
TYPE R
24 to 1768 °C
400
600
Temperature °C
800
1000
1200
1400
1600
1800
2000
Our equipment is guaranteed against defective material and workmanship (excluding batteries) for a period of three years from the
date of shipment. Claims under guarantee can be made by returning the equipment prepaid to our factory. The equipment will be
repaired, replaced or adjusted at our option. The liability of Practical Instrument Electronics (PIE) is restricted to that given under our
guarantee. No responsibility is accepted for damage, loss or other expense incurred through sale or use of our equipment. Under no
condition shall Practical Instrument Electronics, Inc. be liable for any special, incidental or consequential damage.
Practical Instrument Electronics, Inc. Copyright 2003. All rights reserved.
Warranty
Your Local PIE Representative
525-9001 2/28/05
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