PIE PIECAL 322 Operating Instructions Manual

Page 1

Practical Instrument Electronics

82 East Main Street Suite 3.14 • Webster, NY 14580 Tel: [phone] • Fax: [phone] • [e-mail] • www.piecal.com

Model 322

Automated Thermocouple Calibrator

Operating Instructions

Model 322

Automated Thermocouple Calibrator

Operating Instructions

Product Description

• Easy to use

With the PIECAL 322 you can check & calibrate all your
thermocouple instruments and measure thermocouple
sensors.

• Take it with you 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 directly in temperature (°C & °F)

Stop carrying around a millivolt source and thermocouple
tables. The PIECAL 322 works with the thermocouples
you use including types J, T, E and K. Easily set any value
quickly to within 0.1° with the adjustable digital
potentiometer “DIAL” plus store any three temperatures
for instant recall with the EZ-CHECK™ switch.

• Calibrate quickly with automatic output stepping

Choose between 2, 3, 5, 11 steps and ramp to
automatically increment the output in 100%, 50%, 25%,
10% of span or continuously ramp between span and
zero. Select the step time to match your system from 5, 6,
7, 8, 9, 10, 15, 20, 25, 30 and 60 seconds.

• Compatible with all process instruments

Connect directly to the thermocouple inputs of smart
transmitters, PLCs, DCS and multichannel recorders and
verify their outputs or displays.

• Measure Thermocouple Sensors

Trouble shoot sensor connections and find broken wires. The PIECAL 322 measures the
thermocouple in degrees C or F.

• Calibration Lab Accurate & Stable

The internal cold junction thermistor is accurate to ±0.1°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 PIECAL 322 more accurate than most other handheld and benchtop
thermocouple calibrators.

Copyright © 2017 All rights reserved • 322-9002 - Rev I 3 May 2017

Page 2

Practical Instrument Electronics

82 East Main Street Suite 3.14 • Webster, NY 14580 Tel: [phone] • Fax: [phone] • [e-mail] • www.piecal.com

q EZ-CHECK™ SWITCH

SOURCE: Instantly output two preset thermocouple

temperatures by moving the EZ-CHECK™ switch to
the “LO” position or “HI” position.

For fast three
point checks select the “SET” position. The
PIECAL 322 will remember the last “SET”
value, even with the power off.
These values can easily be changed to suit the
calibration requirements. The temperatures stored in
the HI and LO positions are also used for Auto
Stepping.

READ: Slide the switch to the SET position. The
PIECAL 322 will display the current temperature from
the thermocouple sensor. Slide the switch to HI and
the highest temperature measured since turn-on or
reset will be displayed; slide the switch to LO and the
lowest temperature measured since turn-on or reset
will be displayed.

w SOURCE/OFF/READ Switch

Select “SOURCE” to output in °C, °F, or millivolts.
Select “READ” to read a thermocouple sensor
or millivolts. Select “OFF” to turn the unit off.

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 0.1°
steps 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
stepping or ramping.

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

Double click the knob to get into the PIECAL 322
Configuration Mode. Use configuration to select
°C or °F, T/C Type, Backlight On/Off, Step Size,
Step Time and Auto Off On/Off, CJC & mV.

CHANGING BATTERIES

Low battery is indicated by “BAT” on the display.
Approximately one to four hours of typical
operation remain before the PIECAL 322 will
automatically turn off. To change the batteries;
remove the rubber boot, 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. Purchase the optional Ni-MH
rechargeable batteries for maximum battery life.

Basic Operation

LO

TYPE J

°F

THERMOCOUPLE

CALIBRATOR

J, T, E, K, mV

READ

SOURCE

HI

SET

LO

MAX

READ

MIN

OVERLOAD

Push & Hold

to

Store/Ramp

Push & Turn

for

Fast Dialing

Double Click

for Options

OFF

322.1

T/C

+

-

Simulating or reading thermocouples requires
the use of thermocouple or extension grade
thermocouple wire.
Plug thermocouple wires into the miniature
thermocouple jack or place bare thermocouple
wires onto the brass block under the screws.

Connections

The PIECAL 322 has two banana jacks mounted
in the top end of the housing. These are not
temperature compensated and are to be used
only for millivolt signals.

Page 3

Practical Instrument Electronics

82 East Main Street Suite 3.14 • Webster, NY 14580 Tel: [phone] • Fax: [phone] • [e-mail] • www.piecal.com

Configuration

Configure the Calibrator

Move w POWER SWITCH to “SOURCE” or
“READ”.

Setup

Double click the

e DIAL KNOB at any time the

unit is on and the following displays will appear
for 15 seconds:
Turn the e DIAL KNOB to move through the
three pages of menus. Press the e DIAL KNOB
to toggle between OFF and ON or to scroll
through the settings.

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

UNITS - pressing the knob will toggle between
°C and °F.

FUNCTION - pressing the knob will toggle
between T/C and V. Select T/C for thermocouple
or V for the -13.000 to 80.000 mV range.

T/C TYPE - pressing the knob will cycle through
T/C types J, K, E & T.

DOUBLE CLICK

EZ-DIAL KNOB

FOR CONFIGURATION

V#.##

COLD JUNC - Automatic COLD JUNCTION

(Cold Junction Compensation) may be turned
on or off. It is recommended that CJC be left on
(default). CJC should only be turned off if an
external cold junction compensator or ice bath is
used with the PIECAL 322.

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.

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.

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.

Note: All settings are remembered even with the
power off. Removing the batteries resets the
values to factory defaults.

MAIN

> EXIT (1/2)
FUNCTION T/C V
UNITS °C °F
T/C TYPE

J K E T

COLD JUNC ON OFF

FEATURES
> EXIT (2/2)
AUTO OFF ON OFF
BACKLIGHT ON OFF
STEPS/RAMP 2 3 5 11 RAMP
STEP/RAMP TIME 5 6 7 8 9 10 15 20 25 30 60