PIE Practical Instrument Electronics 525B Operating Manual

PIE 525B

Automated Thermocouple &

RTD Calibrator

Operating Instructions

PIE 525B

Automated Thermocouple &

RTD Calibrator

Operating Instructions

Tel: [phone] • Fax: [phone] • [e-mail] • www.piecal.com

Practical Instrument Electronics

82 East Main Street Suite 3.14 • Webster, NY 14580 USA

Contents

General Operations

Connections ............................................................................ 4

Accessories ............................................................................. 5

Carrying Case, Boot................................................................6

Changing Batteries & Storing EZ-CHECK Outputs ................7

Basic Operation

Switches & Knobs ................................................................8-9

MAIN Menus - Functions, Units & Ranges ...................... 10-11

FEATURE Menu - Stepping & Ramping / Auto Off ............... 12

FEATURE Menu - Stepping & Ramping / Backlight .............13

Functions and Hookup Diagrams

Millivolt

Source mV; Read mV ...................................................... 14,15

Thermocouple

Source T/C & Read T/C Sensors ..................................... 16,17

Resistance

Source Resistance, Read Resistance.............................. 18,19

RTD

Source RTD & Read RTD Sensors.................................20, 21

Troubleshooting RTD Instruments ........................................22

Troubleshooting RTD Sensors ..............................................24

Specifications

General ............................................................................26-29

Thermocouple Ranges & Accuracies...............................30-33

RTD Ranges & Accuracies ..............................................34-35

Warranty

Warranty & Additional Information ........................................ 37

General Information

Calibrate all your T/C & RTD Instruments

• Easy to use

With the PIE 525B you can check and calibrate
all your thermocouple and RTD instruments and
measure temperature sensors.

• Take it into the shop, plant or field

Carry it without worry - it comes protected with a
rubber boot and rugged, low profile switches.
Easy to operate even in the dark areas of the
plant with the backlit display.

Calibrate T/C instruments to 0.1 & 0.01 °F & °C

•

The PIE 525B works with the thermocouples
you use including types J, K, T, E, R, S, B, N, G,
C, D, L (J-DIN), U (T-DIN) and P (Platinel II). Or
calibrate from -13.0000 to +80.0000 mV.

• Calibrate RTD instruments to 0.1 & 0.01 °F & °C

Stop carrying around a decade box and RTD
resistance tables. The 525B works with the
RTDs you use including Platinum 10, 50, 100,
200, 500 & 1000 Ohm (alpha = 3850), Platinum
100 Ohm (alpha = 3902, 3916, 3926), Copper
10 & 50 Ohm, and Nickel 120 Ohm. Or calibrate
from 0.000 to 400.000 and 0.00 to 4000.00
Ohms.

Page 1

• Fast calibration with automatic output
stepping

Easily set any value quickly to within 0.1° or 0.01°
with the adjustable digital potentiometer “DIAL”
plus store any three temperatures for instant
recall with the EZ-CHECK™ switch. Choose
between 2, 3, 5, 11 steps and ramp to
automatically increment the output in 100%, 50%,
25%, 10% or 5% of span. Select step time from
5, 6, 7, 8, 9, 10, 15, 20, 25, 30 & 60 seconds.

• Compatible with ALL process instruments

No competitor’s calibrator is compatible with as
many process instruments! Connect directly to the
temperature inputs of transmitters, PLCs, DCS &
multichannel recorders to verify their outputs or
displays. RTD simulation works with older
instruments with fixed excitation currents and newer
multichannel instruments that switch the excitation
current between input channels.

• Perform Heat Treating Uniformity Surveys and
System Accuracy Tests

The PIE 525B meets or exceeds the
requirement of AMS 2750 as a Secondary
Standard & as a Field Test Instrument.

• Measure thermocouple & RTD sensors

The PIE 525B measures probes to 0.1 or 0.01
°C or °F. Secondary display shows the millivolt
or resistance value corresponding to the sensor

Page 2

temperature. For T/Cs the cold junction
temperature measured by the calibrator. For
RTDs the fixed or pulsed sensor current
outputted by the measuring instrument is
measured by the calibrator.

• Find problems with troubleshooting tools

Open thermocouples and thermocouples that
have high resistance indicating impending failure
are indicated by OPEN TC on the display.
Troubleshoot RTD sensor connections and find
broken wires with patented technology. Connect
your two, three or four wire RTDs and the PIE
525B automatically detects the connections.

• Calibration Lab Accurate & Stable

The internal cold junction thermistor is accurate
to ±0.05°C and is traceable to NIST. The sensor
is thermally bonded to an isothermal mass
which includes brass blocks with screw
terminals for connection of bare thermocouple
wires along with a miniature thermocouple
connector for fast connections. The circuitry
uses an extremely stable voltage reference and
low drift components which make the PIE 525B
more accurate than most other handheld and
bench top thermocouple calibrators.

Become a troubleshooting technician with

Patented Diagnostic Technology - Available only

with PIE Calibrators!

Page 3

Connections

Simulating or reading thermocouples requires the use of
thermocouple or extension grade thermocouple wire.

Plug thermocouple wires into the miniature jack or place bare
thermocouple wires onto the brass block under the screws.

The PIE 525B has two banana jacks (1+ & 2-) mounted in the
top end of the housing. These are not temperature compensated
and are to be used only for millivolt signals or thermocouple
signals with the cold junction turned off.

Simulating or reading RTDs uses copper wire.

Plug 2, 3 or 4 wires into the corresponding jacks on the
calibrator. For RTD source the PIE 525B simulates the (+) RTD
from jacks 1 & 4 and the (-) RTD from jacks 2 & 3.

When reading an RTD sensor the PIE 525B uses patented
circuitry to automatically detect if 2, 3 or 4 wires are connected.
This is helpful to troubleshoot sensor connection (see
Troubleshooting an RTD Sensor).

Page 4

Accessories

INCLUDED:

Four “AA” Alkaline batteries, Certificate of Calibration

Evolution Hands Free Carrying Case Part No. 020-0211

Dark Blue Rubber Boot Part No. 020-0213

Test Leads - one pair with Part No. 020-0207
banana plug & alligator clips

Evolution RTD Wire Kit Part No. 020-0208
2 Red & 2 Black Leads with
Banana Plugs & Spade Lugs

OPTIONAL:

Ni-MH 1 Hour Charger with 4 Ni-MH AA Par t No. 020-0103

Batteries (100-120 V AC input for North America Only)

T/C Wire Kit 1* for Types J, K, T & E Part No. 020-0202

T/C Wire Kit 2* for Types B, R/S & N Part No. 020-0203

*Three feet (1 meter) of T/C extension wire, stripped on one
end with a miniature T/C male connector on the other end.

Page 5

Operating Instructions

FIELD & BENCH USE

PIE 525B comes with a carrying case designed for hands-free
operation and a rubber boot with a built-in tilt stand. The PIE
525B is held in the case by elastic straps for use with the
carrying case open. The tilt stand is easily raised by pulling the
stand until it locks into place.

Page 6

Operating Instructions

CHANGING BATTERIES

Low battery is indicated by a battery symbol on the display.
Approximately one to four hours of typical operation remain before
the PIE 525B will automatically turn off. To change the batteries
remove the rubber boot and remove the battery door from the
back of the unit by sliding the door downward. This allows access
to the battery compartment. Replace with four (4) “AA” 1.5V
batteries being careful to check the polarity. Replace the battery
door and replace the boot. All stored configuration options (T/C
Type, EZ-CHECK Memories, etc.) are reset to factory settings
when the batteries are removed.
Note: Alkaline batteries are supplied and recommended for
typical battery life and performance. Optional rechargeable
batteries (charged externally) are available.

STORING HI and LO EZ-CHECK Source Outputs

Speed up your calibration by storing Span & Zero output setting
for instant recall with the EZ-CHECK switch.

1) Store your high (SPAN) output temperature by moving the

EZ-CHECK switch to the HI position and turning the EZ-Dial
knob until the desired output value is on the display. Press
and hold the EZ-Dial knob until STORED appears to store
the value. Release the EZ-Dial knob.

2) Store your low (ZERO) output value by moving the EZ-CHECK

switch to the LO position and turning the EZ-Dial knob until
the desired output value is on the display. Press and hold the
EZ-Dial knob until STORED appears to store the value.
Release the EZ-Dial knob.

3) Instantly output your SPAN and ZERO output settings by

moving the EZ-CHECK switch between HI and LO. You may
also select any third output setting (such as mid-range) using
the SET position on the EZ-CHECK switch.

Page 7

Operating Instructions

Basic Operation

+

-

22.4°C

T/C

43.307mV

1052.50

HI

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

HI

SET

LO

OVERLOAD

°C

TYPE K

SOURCE

MAX

READ

OFF

MIN

READ

Double Click

Menu

Push & Turn

for
Fast Dialing
Push & Hold

to

Store/Step

q EZ-CHECK™ SWITCH

SOURCE: Instantly output two preset settings by moving the

EZ-CHECK™ switch to the “LO” position or “HI” position.
three point checks select the “SET” position. The PIE 525B will
remember the last “SET” value, even with the power off.
These values can easily be changed to suit the calibration requirements.
The values stored in the HI and LO positions are also used for Auto
Stepping.

For fast

READ: Slide the switch to the SET position. The PIE 525B will display
the current reading from the sensor or device being measured. Slide
the switch to MAX and the highest value measured since turn-on or
reset will be displayed; slide the switch to MIN and the lowest value
measured since turn-on or reset will be displayed.

Page 8

Operating Instructions

Basic Operation

w SOURCE/OFF/READ Switch

Select “SOURCE” to output mV, T/C, Ω or RTD.
Select “READ” to read mV, T/C, Ω or RTD.
Select “OFF” to turn off the 525B.

e EZ-DIAL™ KNOB

SOURCE: Turn the knob to adjust the output level. Turn clockwise to
increase the output, counter clockwise to decrease the output in one
least significant digit step at a time. Push down and turn the
EZ-DIAL knob for faster dialing.
Press and hold the knob for two seconds to store desired
EZ-Check™ HI/LO points in SOURCE mode. Continue to press and
hold the knob for two more seconds to start the automatic ramping.

READ: Press and hold to transfer the current temperature into
the EZ-Check™ MIN/MAX points. This clears the MIN/MAX
readings which will update as the input value changes.

SELECTING FUNCTIONS

The EZ-DIAL knob is used to setup the PIE 525B to match the
instrument to be calibrated or signal to be measured. Each time
you turn on the PIE 525B the LCD displays the following screen
for about 1 second followed by operating in the function used the
last time it was operated.

PIE 525B

DOUBLE CLICK

EZ-DIAL KNOB

FOR CONFIGURATION

Double Click the EZ-DIAL knob to change the function of the
calibrator and to select ranges, units and other user settings.
Each function (mV, T/C, Ohms, RTD) has up to three pages of
menus. The first menu page has settings for the function and the
last menu page has settings for STEPPING, AUTO OFF and
BACKLIGHT. Settings are remembered even with the power off
but are reset when the batteries are changed.

Page 9

Operating Instructions

Double Click Menus - MAIN Page

Double click the EZ-DIAL knob to access the Double Click

Menus. Shown are the MAIN menus for each function. Turn the
knob to scroll thru the menus and press the knob to select. Default
values are in black and available choices are shown in grey.

Source V

>EXIT (1/3)
FUNCTION V
RANGE 80mV

>EXIT (1/3)
FUNCTION V
RANGE 80mV

Read V

Source & Read Thermocouples

>EXIT (1/3)
FUNCTION T/C
UNITS °C °F
T/C TYPE J K E T R S B N L U G C D P
COLD JUNC ON OFF

Source Ohms

>EXIT (1/3)
FUNCTION OHMS
RANGE 400Ω 4000Ω

>EXIT (1/3)
FUNCTION OHMS
RANGE 400Ω 4000Ω

Read Ohms

Source RTD

>EXIT (1/3)
FUNCTION RTD
UNITS °C °F
RTD Pt 100 a=3850 [*RTD Types - See Read RTD]

Read RTD

>EXIT (1/3)
FUNCTION RTD
UNITS °C °F

RTD Pt 100 a=3850,

Pt 1000 a=3850, Pt 100 a=3902, Pt 100 a=3916,
Pt 100 a=3926, Cu 10 a=4274, Cu 50 a=4280, Ni 120 a=6720
Pt 10 a=3850, Pt 50 a=3850

Pt 200 a=3850, Pt 500 a=3850,

Page 10

Operating Instructions

Double Click Menu - DISPLAY Page

Double click the e DIAL KNOB at any time the unit is on and
then turn the e DIAL KNOB to move to the second menu page
so the word DISPLAY appears at the top of the menu.
Turn the e DIAL KNOB to move through the menu. Press the e
DIAL KNOB to toggle between LOW and HIGH or OFF and ON.

LOW resolution is 0.001 mV, 0.01Ω in 400Ω Range, 0.1Ω in
4000Ω Range and 0.1° for T/C & RTD. HIGH resolution is 0.0001
mV, 0.001Ω in 400Ω Range, 0.01Ω in 4000Ω Range and 0.01° for
T/C & RTD.

> EXIT (2/3)
RESOLUTION LOW HIGH

DISPLAY [Thermocouple]
> EXIT (2/3)
RESOLUTION LOW HIGH

DISPLAY mV OFF ON
DISPLAY CJ OFF ON [Cold Junction Temperature]

> EXIT (2/3)
RESOLUTION LOW HIGH

SENSOR mA* OFF ON

DISPLAY [RTD]
> EXIT (2/3)
RESOLUTION LOW HIGH

DISPLAY OHMS OFF ON
SENSOR mA* OFF ON

* SENSOR mA is only available when sourcing Ohms & RTD.

EXIT MENU - exits this menu immediately and saves any
changes. Menu will automatically exit after 15 seconds of
inactivity. Settings are remembered even with the power off.

DISPLAY [Millivolts]

DISPLAY [Ohms]

Page 11

Operating Instructions

Double Click Menu - FEATURES

To change the Automatic Stepping settings

Double click the e DIAL KNOB at any time the unit is on and
the following typical display (will be different for each FUNCTION)
will appear for 15 seconds:

MAIN
> EXIT (1/3)
FUNCTION T/C
UNITS °C
T/C TYPE J
COLD JUNC ON

Turn the
word FEATURES appears at the top of the menu.

Turn the e DIAL KNOB to move through the menu. Press the e
DIAL KNOB to toggle between OFF and ON or to change the
STEPS/RAMP and the STEP/RAMP TIME settings. These
settings are remembered even with the power off.

EXIT MENU - exits this menu immediately and saves any
changes. Menu will automatically exit after 15 seconds of
inactivity.

e DIAL KNOB to move to the third menu page so the

FEATURES

> EXIT (3/3)
AUTO OFF ON
BACKLIGHT ON
STEPS/RAMP 3
STEP/RAMP TIME 5

AUTO OFF - If AUTO OFF is ON, the unit will turn off after 30

minutes of inactivity to save battery life. If AUTO OFF is OFF the
unit will stay on until the POWER SWITCH is moved to the off
position.

Page 12

Operating Instructions

Double Click Menu - FEATURES

STEPS/RAMP - pressing the knob will cycle through 2, 3, 5, 11

and RAMP. The endpoints of the steps or ramp are based on the
values stored in the HI and LO EZ-CHECK outputs.

2 steps will automatically switch between the values stored in
the HI & LO EZ-CHECK (0 & 100%).

3 steps between the HI, Midpoint and LO EZ-CHECK (0, 50
& 100%).

5 steps between the HI and LO EZ-CHECK in 25%
increments (0, 25, 50, 75 & 100%).

11 steps between the HI and LO EZ-CHECK in 10%
increments (0, 10, 20...80, 90 &100%).

RAMP continuously ramps up and down between the HI and
LO EZ-CHECK outputs.

STEP/RAMP TIME - pressing the knob will cycle through 5, 6, 7,
8, 9, 10, 15, 20, 25, 30 and 60 seconds.

To start the Automatic Stepping

Start automatic stepping or ramping by placing the EZ-CHECK
Switch into the HI or LO position then press and hold the e
DIAL KNOB for 6 seconds (the word STORE will appear on the
display after 3 seconds and continue to press the EZ-DIAL
KNOB) until the word STEPPING appears on the display. The
word STEPPING will appear on the display anytime the selected
automatic function is running. Stop the stepping by again
pressing and holding the

e DIAL KNOB for 3 seconds.

BACKLIGHT - If BACKLIGHT is ON the backlight will light all the
time the unit is powered up. For maximum battery life turn the
backlight off when using the calibrator in areas with enough
ambient light to read the display.

Page 13

SOURCE mV

Choose this function to provide an output from -13.000 to 80.000
mV in LOW resolution and -13.0000 to 80.0000 mV in HIGH
resolution. The source current is a nominal 12 mA to provide the
driving power to analog thermocouple meters.

Move the power switch

w to SOURCE then Double Click the

EZ-DIAL knob to get into the Menu. Turn the knob to scroll
through the settings and press the knob to make your selection.
Select V for the FUNCTION.

Connect the output leads of the PIE 525B to the inputs of the
device being calibrated, making sure to check polarity. Red lead
to the plus (+) input and black lead to the minus (-) input.

Instantly output your SPAN and ZERO output settings by moving
the EZ-CHECK switch between HI and LO. You may also select
any third output setting (such as mid-range) using the SET
position on the EZ-CHECK switch. The output is adjusted in

0.001 mV increments in LOW and 0.0001 increments in HIGH
resolution by turning the knob

e. Press and turn the knob for

faster dialing with 0.100 mV increments in LOW and 0.0100 mV
increments in HIGH resolution.

Voltage Receiver Input

+

-

1 2

80.000

HI

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

SOURCE

MAX

HI

READ

SET

OFF

MIN

LO

Double Click

OVERLOAD

mV

READ

Menu

Push & Turn

for
Fast Dialing
Push & Hold

to
Store/Step

Controller

Transmitter

Computer

Logger

DCS

-

2

3

mV

RTD

mV Source

+

1

4

Ω

+-

T/C

Page 14

Read mV

Choose this function to measure from -13.000 to 80.000 mV in
LOW resolution and -13.0000 to 80.0000 mV in HIGH resolution.

Move the power switch

w to READ then Double Click the

EZ-DIAL knob to get into the Menu. Turn the knob to scroll
through the settings and press the knob to make your selection.
Select V for the FUNCTION.

Connect the red input lead (+) of the PIE 525B to the more
positive point and the black input lead (-) to the more negative
point.

Signals above the maximum scale are limited by protection
circuitry with “OVER RANGE” flashed on the display and the red
OVERLOAD LED lit.

The PIE 525B measures the input signal and constantly updates
the display with the current reading. Move the EZ-CHECK switch

q to MAX to see the highest reading and to MIN to see the

lowest reading. Press and hold the knob
MIN readings.

e to clear the MAX and

+

-

1 2

52.500

MAX

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

MAX

HI

READ

SET

OFF

MIN

LO

Double Click

OVERLOAD

Voltage Output Signal

Controller

Transmitter

mV

SOURCE

READ

Menu

Push & Turn

for
Fast Dialing
Push & Hold

to

Store/Step

Power Supply

-

2

3

mV

RTD

mV Read

+

1

4

Ω

+-

T/C

Page 15

Source Thermocouple

Choose this function to provide a simulated thermocouple signal
into controllers, temperature transmitters, indicators or any input
devices that measure thermocouple sensors.

Move the power switch

w to SOURCE then Double Click the

EZ-DIAL knob to get into the Menu. Turn the knob to scroll
through the settings and press the knob to make your selection.
Select T/C for the FUNCTION, °F or °C for the UNITS, T/C Type
(J, K, E, T, R, S, B, N, L (J-DIN), U (T-DIN), G, C, D or P (Platinel
II)) and internal COLD JUNC ON or OFF (ON is the default).

Connect the PIE 525B to the inputs of the device being
calibrated using the proper type of thermocouple wire via the
miniature thermocouple socket or place bare thermocouple
leads under the brass screws.

Instantly output your SPAN and ZERO output settings by moving
the EZ-CHECK switch between HI and LO. You may also select
any third output setting (such as mid-range) using the SET
position on the EZ-CHECK switch. The output is adjusted in 0.1°
increments in LOW and 0.01° increments in HIGH resolution by
turning the knob

e. Press and turn the knob for faster dialing

with 10.0° increments in LOW and 1.00° increments in HIGH
resolution.

1052.50

HI

Thermocouple Calibrator

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

OVERLOAD

22.4°C

43.307mV

TYPE K

Automated RTD &

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

MAX

HI

READ

SET

MIN

LO

Thermocouple Wire

+

-

T/C

°C

SOURCE

OFF

READ

Double Click

Menu

Push & Turn

for
Fast Dialing
Push & Hold

to
Store/Step

Instrument with T/C Input

Controller

Temperature Transmitter

Temperature Indicator

Temperature Trip or Alarm

mV

-

2

RTD

3

Ω

Bare thermocouple wires

+

1

4

T/C

+-

Miniature thermocouple connectors

Page 16

Read Thermocouple Sensors

Choose this function to measure temperatures with a
thermocouple probe, sensor or any devices that output a
thermocouple signal.

Move the power switch

w to READ then Double Click the

EZ-DIAL knob to get into the Double Click Menu. Turn the knob
to scroll through the settings and press the knob to make your
selection. Select T/C for the FUNCTION, °F or °C for the UNITS,
T/C Type (J, K, E, T, R, S, B, N, L (J-DIN), U (T-DIN), G, C, D or
P (Platinel II)) and COLD JUNC ON or OFF (ON is the default).

Connect the PIE 525B to the inputs of the device being
calibrated using the proper type of thermocouple wire via the
miniature thermocouple socket or place bare thermocouple
leads under the brass screws. If no sensor is connected, a wire
is broken or the sensor is burned out, OPEN TC will appear on
the display. Signals above the maximum scale are limited by
protection circuitry with “OVER RANGE” on the display.

The PIE 525B measures the input signal and constantly updates
the display with the current reading. Move the EZ-CHECK switch

q to MAX to see the highest reading and to MIN to see the

lowest reading. Press and hold the knob e to clear the MAX and
MIN readings.

23.7°C

21.710mV

525.00

MIN

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

HI

SET
LO

OVERLOAD

Thermocouple

Wire

+

-

T/C

°C

TYPE K

SOURCE

MAX

READ

OFF

MIN

READ

Double Click

Menu

Push & Turn

for
Fast Dialing
Push & Hold

to
Store/Step

Page 17

Source Resistance

Choose this function to provide a simulated resistance into any
device that measures resistance.

Move the power switch w to SOURCE then Double Click the
EZ-DIAL knob to get into the Menu. Turn the knob to scroll
through the settings and press the knob to make your selection.
Select OHMS for the FUNCTION, 400Ω or 4000Ω for the RANGE.

Disconnect all sensor wires from the devices to be calibrated and
connect the PIE 525B to the inputs of the device using 2, 3 or 4 wires.

Instantly output your SPAN and ZERO output settings by moving
the EZ-CHECK switch between HI and LO. You may also select
any third output setting (such as mid-range) using the SET
position on the EZ-CHECK switch. The output is adjusted for
400Ω/4000Ω ranges in 0.01Ω/0.1Ω increments in LOW and

0.001Ω/0.01Ω increments in HIGH resolution by turning the knob

e. Press and turn the knob for faster dialing with 1.00Ω/10.0Ω

increments in LOW and 0.100Ω/1.00Ω increments in HIGH
resolution.

Instrument with

Resistance Input

+

-

01.05mA FIXED

1

324

305.25

HI

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

SOURCE

MAX

HI

READ

SET

OFF

MIN

LO

Double Click

OVERLOAD

Ω

READ

Menu

Push & Turn

for
Fast Dialing
Push & Hold

to
Store/Step

Controller

Transmitter

PLC

2, 3 & 4 Wire Resistance Connections

+

mV

-

2

3

RTD

1

4

Ω

T/C

+-

Page 18

Read Resistance

Choose this function to measure resistance.

Move the power switch

w to READ then Double Click the

EZ-DIAL knob to get into the Menu. Turn the knob to scroll
through the settings and press the knob to make your selection.
Select OHMS for the FUNCTION, 400Ω or 4000Ω for the
RANGE.

Connect the PIE 525B to the resistor or sensor using 2, 3 or 4
wires. The PIE 525B automatically detects how many wires are
connected using a patented circuit and indicates each wire that
is connected. Any wires that are not connected or broken are
indicated by the 525B. This is useful for troubleshooting the
sensor.

Signals above the maximum scale are limited by protection
circuitry with “OVER RANGE” on the display.

The PIE 525B measures the input signal and constantly updates
the display with the current reading. Move the EZ-CHECK switch

q to MAX to see the highest reading and to MIN to see the

lowest reading. Press and hold the knob e to clear the MAX and
MIN readings.

+

-

2 1

Ω

250.025

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

SOURCE

MAX

HI

READ

SET

OFF

MIN

LO

Double Click

OVERLOAD

READ

Menu

Push & Turn

for

Fast Dialing
Push & Hold

to

Store/Step

2, 3 & 4 Wire Resistance Connections

+

mV

-

2

3

RTD

1

4

Ω

T/C

+-

Page 19

Source RTD

Choose this function to provide a simulated RTD signal into
controllers, temperature transmitters, indicators or any input
devices that measure RTD sensors.

Move the power switch

w to SOURCE then Double Click the

EZ-DIAL knob to get into the Menu. Turn the knob to scroll
through the settings and press the knob to make your selection.
Select RTD for the FUNCTION, °F or °C for the UNITS and RTD
(Platinum 10, 50, 100, 200, 500 & 1000 Ohm (alpha = 3850),
Platinum 100 Ohm (alpha = 3902, 3916, 3926), Copper 10 & 50
Ohm, and Nickel 120 Ohm).
Note: Platinum (Pt) 100Ω 3850 is the most common RTD type.

Disconnect all sensor wires from the devices to be calibrated and
connect the PIE 525B to the inputs of the device using 2, 3 or 4 wires.

Instantly output your SPAN and ZERO output settings by moving
the EZ-CHECK switch between HI and LO. You may also select
any third output setting (such as mid-range) using the SET
position on the EZ-CHECK switch. The output is adjusted in 0.1°
increments in LOW and 0.01° increments in HIGH resolution by
turning the knob

e. Press and turn the knob for faster dialing with

10.0° increments in LOW and 1.00° increments in HIGH resolution.

Instrument with RTD Input

+

-

01.15mA PULSE

241

3

289.27 Ω

525.00

Pt 100 α=3850

LO

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

SOURCE

MAX

HI

READ

SET

OFF

MIN

LO

Double Click

OVERLOAD

°c

READ

Menu

Push & Turn

for
Fast Dialing
Push & Hold

to

Store/Step

Controller

Temperature Transmitter

Temperature Indicator

Temperature Trip or Alarm

2, 3 & 4 Wire RTD Connections

mV

-

2

RTD

3

Ω

+

1

4

+-

T/C

Page 20

Read RTD Sensors

Choose this function to measure temperatures with an RTD
probe, sensor or any devices that output an RTD signal.

Move the power switch w to READ then Double Click the EZ-DIAL
knob to get into the Menu. Turn the knob to scroll through the
settings and press the knob to make your selection. Select RTD for
the FUNCTION, °F or °C for the UNITS and RTD (Platinum 10, 50,
100, 200, 500 & 1000 Ohm (alpha = 3850), Platinum 100 Ohm
(alpha = 3902, 3916, 3926), Copper 10 & 50 Ohm, and Nickel 120
Ohm).
Note: Platinum (Pt) 100Ω 3850 is the most common RTD type.

Connect the PIE 525B to the RTD sensor using 2, 3 or 4 wires. The
PIE 525B automatically detects how many wires are connected
using a patented circuit and indicates each wire that is connected.
Any wires that are not connected or broken are indicated by the
525B. This information is useful for troubleshooting the sensor.

Signals above the maximum scale are limited by protection
circuitry with “OVER RANGE” on the display.

The PIE 525B measures the input signal and constantly updates the
display with the current reading. Move the EZ-CHECK switch q to
MAX to see the highest reading and to MIN to see the lowest reading.
Press and hold the knob

e to clear the MAX & MIN readings.

+

-

2 1

3

138.51 Ω

100.00

°c

Pt 100 α=3850

MIN

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

SOURCE

MAX

HI

READ

SET

OFF

MIN

LO

READ

Double Click

Menu

OVERLOAD

Push & Turn

for
Fast Dialing
Push & Hold

to
Store/Step

Page 21

Troubleshooting RTD Instruments

When you are having an issue where an instrument won't read
an RTD sensor or you don't know if the calibrator is connected
properly the PIE 525B has a function to measure and display the
fixed or pulsed sensor (excitation) current that the instrument
uses to measure the resistance of the RTD sensor.

Double click the
then turn the e DIAL KNOB to move to the second menu page
so the word DISPLAY appears at the top of the menu.
Turn the
cursor is pointing at SENSOR mA. Press the e DIAL KNOB to
toggle SENSOR mA ON.

Disconnect all sensor wires from the devices to be calibrated and
connect the PIE 525B to the inputs of the device using 2, 3 or 4 wires.
The sensor current generated by the instrument will be indicated on
the display followed by the word FIXED or PULSE. Older single
channel RTD instruments used a constant (fixed) current source to
measure an RTD sensor. Smart transmitters, multichannel recorders
and PLC or DCS input cards switch the current source sequentially
through the channels which is seen as an intermittent (pulsed)
current.

e DIAL KNOB at any time the unit is on and

e DIAL KNOB to move through the menu until the

Page 22

Instrument with RTD Input

°C

00.21mA FIXED

289.27 Ω

525.00

01.15mA PULSE

289.27 Ω

525.00

°C

Controller

Temperature Transmitter

Temperature Indicator

Temperature Trip or Alarm

+

-

01.15mA PULSE

241

3

289.27 Ω

525.00

°c

Pt 100 α=3850

LO

Automated RTD &

Thermocouple Calibrator

Pt 10, 50, 100, 200, 500 & 1000Ω

Cu 10 & 50Ω · Ni 120Ω

J · T · E · K · R · S · B · N · G · C · D · L· U · P · mV

OVERLOAD

SOURCE

MAX

HI

READ

SET

OFF

MIN

LO

READ

Double Click

Menu

Push & Turn

for
Fast Dialing
Push & Hold

to

Store/Step

Page 23

Troubleshooting RTD Sensors

When troubleshooting a problem with an RTD input it is useful to
check that the sensor and the wiring to the instrument is
operating properly.

The PIE 525B automatically detects 2, 3 and 4 wire RTD
connections with a patented circuit. It will also display the
connections on the display and indicate when there is a missing
connection due to a loose connector, corrosion or a broken wire.

Here is an example of the 525B reading a
sensor with all 4 wire connected.

Here is an example where connections are
made to a 4 wire sensor and the PIE 525B
indicates that only Wires 1, 2 & 4 are connected.
There may be a loose connection or a break in
wire 3 somewhere between the sensor and the
525B.

Page 24

Page 25

PIE 525B Specifications

Unless otherwise indicated all specifications (except Cold

Junction) are rated from a nominal 23 °C, 70 % RH

General

Operating
Temperature Range

Storage
Temperature Range

Temperature
effect

Relative
Humidity Range

Normal Mode

Rejection

Common Mode

Rejection

Size

Weight 12.1 ounces, 0.34 kg with boot & batteries

Batteries Four “AA” Alkaline 1.5V (LR6)

Optional NiMh

Rechargeable
battery kit

Battery Life 50 Hours

Low Battery Low battery indication with nominal 1 hour

for 1 year from calibration

-20 to 60 °C (-5 to 140 °F)

-30 to 60 °C (-22 to 140 °F)

≤ ±50 ppm/°C;
Cold Junction Sensor ≤ ±25 ppm/°C

10 % ≤RH ≤90 % (0 to 35 °C), Non-condensing

10 % ≤RH≤ 70 % (35 to 60 °C), Non-condensing

50/60 Hz, 50 dB

50/60 Hz, 120 dB

5.63 x 3.00 x 1.60 in, 143 x 76 x 41mm

120 VAC for North America Only; charger,

four

NiMh batteries, AC & DC cords

[Part # 020-0103]

of operation left

(L x W x H)

Page 26

PIE 525B Specifications

Protection
against
misconnection

Display High contrast graphic liquid crystal display.

Voltage Source

Ranges and
Resolution

Accuracy ±(0.008% of Setting + 0.006 mV)

Source Current

Output
Impedance

RMS Noise ≤ ± 0.0005 mV from 0.1 to 10 Hz

Short Circuit

Duration

Voltage Read

Range and Resolution Same as Voltage Source

Accuracy ±(0.008% of Reading + 0.006 mV)

Input resistance ≥ 10 MΩ

Over-voltage protection to 60 vrms (rated for
30 seconds)

Red LED indicates OVERLOAD or out of

range conditions

LED backlighting for use in low lit areas.

-13.000 to 80.000 mV & -13.0000 to 80.0000 mV

≥ 10 mA

< 0.3 Ohm

Infinite

Page 27

PIE 525B Specifications

Thermocouple Source

Accuracy ±(0.008% of Setting + 0.006 mV)

Cold Junction
Compensation

Output
Impedance

Source Current > 10 mA (drives 80 mV into 10 Ohms)

RMS Noise ≤ ± 0.0005 mV from 0.1 to 10 Hz

Thermocouple Read

Accuracy ±(0.008% of Reading + 0.006 mV)

Cold Junction
Compensation

Input Impedance

Open
Thermocouple

± 0.09°F (±0.05 °C) - Thermistor traceable to
NIST for 11 years

< 0.3 Ohms

± 0.09°F (±0.05 °C) - Thermistor traceable to
NIST for 11 years

> 10 Megohms

Threshold: 10,000 Ohms nominal
Pulse: < 10 microamp pulse for 300 milliseconds

Page 28

PIE 525B Specifications

RTD and Ohms Source

3 Wire & 4 Wire
Accuracy

From 1 to 10.2 mA
External Excitation
Current

Below 1 mA of

External Excitation
Current

2 Wire Accuracy

Resistance Ranges

RMS Noise

Allowable
Excitation
Current Range

Pulsed Excitation
Current
Compatibility

RTD and Ohms Read

Resistance Ranges Same as RTD and Ohms Source

Accuracy ±(0.015% of Reading + 0.05 Ohms)

Excitation
Current

±(0.015% of Setting + 0.05 Ohms)

Add ( ) to Accuracy

Add 0.1 Ohms to 3 Wire & 4 Wire Accuracy

400 Ohm Range: 0.00 to 401.00 & 0.000 to 401.000
4000 Ohm Range: 0.0 to 4010.0 & 0.00 to 4010.00

400 Ohm Range: ≤ ± 0.005 Ohms from 0.1
to 10 Hz

4000 Ohm Range: ≤ ± 0.05 Ohms from 0.1
to 10 Hz

400 Ohm Range:10.2 mA max; steady or pulsed/

intermittent

4000 Ohms Range: 1 mA max; steady or pulsed/

intermittent

DC to 0.01 second pulse width

0.9 mA to 401 Ohms, 0.4 mA to 4010 Ohms

(nominal)

0.025 mV

mA Excitation Current

Page 29

Thermocouple Ranges & Accuracies

Table based on Accuracy:

≤ ± (0.008 % of Reading + 0.006 mV)

Note: Doesn’t include cold junction error of ±0.05°C

T/C Degrees C

Range

J -200.00 to -150.00 ±0.25° -346.00 to -238.00 ±0.55°

-150.00 to -50.00 ±0.17° -238.00 to -58.00 ±0.35°

-50.00 to 300.00 ±0.13° -58.00 to 572.00 ±0.24°

300.00 to 850.00 ±0.15° 572.00 to 1562.00 ±0.28°

850.00 to 1200.00 ±0.20° 1562.00 to 2192.00 ±0.36°

K -230.00 to -100.00 ±0.70° -382.00 to -148.00 ±1.26°

-100.00 to 600.00 ±0.19° -148.00 to 1112.00 ±0.34°

600.00 to 1000.00 ±0.24° 1112.00 to 1832.00 ±0.43°

1000.00 to 1371.1 ±0.31° 1832.00 to 2500.00 ±0.55°

T -260.00 to -240.00 ±1.66° -436.00 to -400.00 ±2.98°

-240.00 to -210.00 ±0.60° -400.00 to -346.00 ±1.07°

-210.00 to -100.00 ±0.41° -346.00 to -148.00 ±0.74°

-100.00 to 50.00 ±0.18° -148.00 to 122.00 ±0.33°

50.00 to 400.00 ±0.14° 122.00 to 752.00 ±0.24°

°C Degrees F

Range

°F

E -240.00 to -225.00 ±0.51° -400.00 to -373.00 ±0.92°

-225.00 to -100.00 ±0.27° -373.00 to -148.00 ±0.48°

-100.00 to 750.00 ±0.13° -148.00 to 1382.00 ±0.24°

750.00 to 1000.00 ±0.16° 1382.00 to 1832.00 ±0.29°

Page 30

Thermocouple Ranges & Accuracies

Table based on Accuracy:

≤ ± (0.008 % of Reading + 0.006 mV)

Note: Doesn’t include cold junction error of ±0.05°C

T/C Degrees C

Range

R -18.30 to 250.00 ±1.26° -1.00 to 482.00 ±2.27°

250.00 to 750.00 ±0.64° 482.00 to 1382.00 ±1.14°

750.00 to 1600.00 ±0.54° 1382.00 to 2192.00 ±0.97°

1600.00 to 1767.80 ±0.63° 2192.00 to 3214.00 ±1.13°

S -18.30 to 150.00 ±1.22° -1.00 to 302.00 ±2.20°

150.00 to 500.00 ±0.72° 302.00 to 932.00 ±1.30°

500.00 to 1650.00 ±0.63° 932.00 to 3002.00 ±1.14°

1650.00 to 1767.80 ±0.73° 3002.00 to 3214.00 ±1.31°

B 315.60 to 550.00 ±1.88° 600.00 to 1022.00 ±3.39°

550.00 to 900.00 ±1.03° 1022.00 to 1652.00 ±1.86°

900.00 to 1150.00 ±0.72° 1652.00 to 2102.00 ±1.30°

1150.00 to 1820.00 ±0.63° 2102.00 to 3308.00 ±1.14°

-230.00 to -100.00 ±1.10° -382.00 to -148.00 ±1.98°

N

-100.00 to 0.00 ±0.30° -148.00 to 32.00 ±0.53°

0.00 to 1100.00 ±0.24° 32.00 to 2012.00 ±0.44°

1100.00 to 1300.00 ±0.27° 2012.00 to 2372.00 ±0.49°

°C Degrees F

Range

°F

Page 31

Thermocouple Ranges & Accuracies

Table based on Accuracy:

≤ ± (0.008 % of Reading + 0.006 mV)

Note: Doesn’t include cold junction error of ±0.05°C

T/C Degrees C

Range

100.00 to 450.00 ±1.14° 212.00 to 842.00 ±2.05°

G

(W)

440.00 to 1700.00 ±0.44° 842.00 to 3092.00 ±0.79°

1700.00 to 2000.00 ±0.54° 3092.00 to 3632.00 ±0.97°

2000.00 to 2320.00 ±0.73° 3632.00 to 4208.00 ±1.32°

C

-

1.10 to 1150.00±0.44° 30.00 to 2102.00 ±0.80°

(W5)

1150.00 to 1750.00 ±0.61° 2102.00 to 3182.00 ±1.09°

1750.00 to 2050.00 ±0.74° 3182.00 to 3722.00 ±1.33°

2050.00 to 2320.00 ±0.99° 3722.00 to 4208.00

D

-1.00 to 150.00 ±0.63° 30.00 to 302.00 ±1.13°

(W3)

150.00 to 1200.00 ±0.41° 302.00 to 2192.00 ±0.73°

1200.00 to 1700.00 ±0.51° 2192.00 to 3092.00 ±0.92°

1700.00 to 2320.00 ±0.97° 3092.00 to 4208.00 ±1.75°

P

0.00 to 950.00 ±0.23° 32.00 to 1742.00 ±0.41°

950.00 to 1395.00 ±0.34° 1742.00 to 2543.00 ±0.61°

°C Degrees F

Range

±

1.79°

°F

Page 32

Thermocouple Ranges & Accuracies

Table based on Accuracy:

≤ ± (0.008 % of Reading + 0.006 mV)

Note: Doesn’t include cold junction error of ±0.05°C

DIN Wire

T/C Degrees C

Range

-200.00 to -100.00 ±0.21°-328.00 to -148.00 ±0.38°

L

J-DIN

-100.00 to 350.00 ±0.13° -148.00 to 662.00 ±0.24°

350.00 to 900.00 ±0.15° 662.00 to 1652.00 ±0.27°

-200.00 to -150.00 ±0.37° -328.00 to -238.00 ±0.66°

U

T-DIN

-150.00 to 100.00 ±0.22° -238.00 to 212.00 ±0.40°

100.00 to 600.00 ±0.15° 212.00 to 1112.00 ±0.28°

°C Degrees F

Range

°F

Page 33

RTD Ranges & Accuracies

Table based on 3 & 4 Wire RTD (ITS-90) Accuracy*:

RTD

Type

Pt 100 Ohm

DIN/IEC/JIS

a

=1.3850

Pt 10 Ohm

DIN/IEC/1989

a

=1.3850

Pt 50 Ohm

DIN/IEC/1989

a

=1.3850

Pt 200 Ohm

DIN/IEC/1989

a

=1.3850

Pt 500 Ohm

DIN/IEC/1989

a

=1.3850

Pt 1000

DIN/IEC/1989

a

=1.3850

*Read based on 1.0 mA of

fixed excitation current

≤ ± (0.015 % of Reading +0.05 Ohms)

Degrees C

1989

Ohm

Range

-200.00 to -150.00

-150.00 to 360.00

360.00 to 740.00

740.00 to 850.00

-200.00 to -120.00

-120.0 to 210.00

210.00 to 370.00

370.00 to 650.00

650.00 to 850.00

-200.00 to 200.00

200.00 to 550.00

550.00 to 850.00

-200.00 to -120.00

-120.00 to 180.00

180.00 to 450.00

450.00 to 680.00

680.00 to 850.00

-200.00 to -90.00

-120.00 to 180.00

180.00 to 450.00

450.00 to 680.00

680.00 to 850.00

-200.00 to 170.00

170.00 to 470.00

470.00 to 730.00

730.00 to 850.00

°C

±0.13°
±0.24°
±0.34°
±0.37°
±1.24°
±1.44°
±1.54°
±1.74°
±1.91°
±0.34°
±0.44°
±0.54°
±0.08°
±0.14°
±0.19°
±0.24°
±0.29°
±0.08°
±0.14°
±0.19°
±0.24°
±0.29°
±0.08°
±0.14°
±0.19°
±0.22°

Page 34

Degrees F

Range

-328.0 to -238.00

-238.00 to 660.00

660.00 to 1364.00

1364.00 to 1562.00

-328.00 to -184.00

-184.00 to 410.00

410.00 to 698.00

698.00 to 1202.00

1202.00 to 1562.00

-328.00 to 392.00

392.00 to 1022.00

1022.00 to 1562.00

-328.00 to -184.00

-184.00 to 356.00

356.00 to 842.00

842.00 to 1256.00

1256.00 to 1562.00

-328.00 to -194.00

-184.00 to 356.00

356.00 to 842.00

842.00 to 1256.00

1256.00 to 1562.00

-328.00 to 338.00

338.00 to 878.00

878.00 to 1346.00

1346.00 to 1562.00

°F

±0.24°
±0.44°
±0.61°
±0.67°
±2.24°
±2.59°
±2.77°
±3.14°
±3.44°
±0.62°
±0.80°
±0.98°
±0.14°
±0.24°
±0.34°
±0.44°
±0.52°
±0.14°
±0.24°
±0.34°
±0.44°
±0.52°
±0.14°
±0.24°
±0.34°
±0.39°

RTD Ranges & Accuracies

Table based on 3 & 4 Wire RTD (ITS-90) Accuracy*:

RTD
Type

Pt 100

(Burns)

a

=1.3902

Pt 100

(Old JIS

1981)

a

=1.3916

Pt 100

(US Lab)

a

=1.3926

≤ ± (0.015 % of Reading +0.05 Ohms)

Degrees C

Range

Ohm

Ohm

Ohm

-200.00 to -100.00

-100.00 to 370.00

370.00 to 648.90

-200.00 to -140.00

-140.00 to 130.00

130.00 to 370.00

370.00 to 648.90

-200.00 to -140.00

-140.00 to 130.00

130.00 to 380.00

380.00 to 610.00

610.00 to 850.00

±0.14°
±0.24°
±0.31°

±0.13°
±0.19°
±0.24°
±0.31°

±0.13°
±0.19°
±0.24°
±0.30°
±0.37°

Degrees F

°C

-328.00 to -148.00

-148.00 to 698.00

698.00 to 1200.00

-328.00 to -220.00

-220.00 to 266.00

266.00 to 698.00

698.00 to 1200.00

-328.00 to -220.00

-220.00 to 266.00

266.00 to 716.00

716.00 to 1130.00

1130.00 to 1562.00

Range

°F

±0.26°
±0.44°
±0.56°

±0.24°
±0.34°
±0.44°
±0.56°

±0.24°
±0.34°
±0.44°
±0.54°
±0.66°

Copper 10

Ohm

(Minco)

a

=1.4274

Copper 50

Ohm

a

=1.4280

Ni 120
Ohm

a=1.6720

*Read based on 1.0 mA of

fixed excitation current

-200.00 to -150.00

-150.00 to 90.00

90.00 to 260.00

-50.00 to 150.00 ±0.29° -58.00 to 302.00 ±0.52°

-80.00 to 260.00 ±0.10° -112.00 to 500.00 ±0.17°

(Pure)

±1.24°
±1.34°
±1.36°

Page 35

-328.00 to -238.00

-238.00 to 194.00

194.00 to 500.00

±2.24°
±2.42°
±2.44°

Guaranteed compatible with smart

transmitters, multichannel recorders as

well as PLC and DCS input cards.

Page 36

Standard Warranty

Our equipment is warranted against defective material and
workmanship (excluding batteries) for a period of three years
from the date of shipment. Claims under warranty 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 warranty. 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.

Optional Repair/Replacement Warranty

Under our Repair/Replacement Warranty (RP-WAR-B), our
equipment is warranted against ANY damage or malfunction
that may cause the unit to fail for a period of three (3) years from
the date of shipment.

This warranty is limited to one complete replacement against
any damage or malfunction during the warranty period. If
replaced, the new calibrator will carry our Standard Warranty for
the remainder of the three (3) years or a minimum of one (1)
year from the date of shipment.

Additional Information

PIE Calibrators are manufactured in the USA.
calibrated on equipment traceable to NIST and includes a
Certificate of Calibration. Test Data is available for an additional
charge.

Practical Instrument Electronics recommends a calibration
interval of one year. Contact your local representative for
recalibration and repair services.

Page 37

This product is

Practical Instrument Electronics

82 East Main Street Suite 3.14

Webster, NY 14580 USA

Tel: [phone] • Fax: [phone]

[e-mail] • www.piecal.com

Copyright © 2015 All rights reserved

525B-9002 - Rev A 10 April 2015