Testo Testo 112 Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

testo 112
NTC- / Pt100 measuring instrument

Instruction manual

Contents

General notes ...................................................... 2

1. Safety advice ....................................................... 3

2. Intended purpose .................................................4

3. Product description ..............................................5

3.1 Display and control elements .......................................... 5

3.2 Interfaces ....................................................................... 6

3.3 Voltage supply ................................................................ 6

4. Commissioning .................................................... 7

5. Operation ............................................................. 8

5.1 Connecting a probe........................................................ 8

5.2 Switching the instrument on / off .................................... 8

5.3 Switching the display light on / off .................................. 9

5.4 Performing settings ........................................................ 9

6. Measuring ..........................................................12

7. Care and maintenance ....................................... 14

8. Questions and answers ......................................15

9. Technical data ...................................................16

10. Accessories/spare parts.....................................18

General notes2

General notes

This chapter provides important advice on using this
documentation.

The documentation contains information that must be
applied if the product is to be used safely and efficiently.

Please read this documentation through carefully and
familiarise yourself with the operation of the product before
putting it to use. Keep this document to hand so that you
can refer to it when necessary.

Identification

Representation Meaning Comments

Note Offers helpful tips and information.

, 1, 2 Objective Denotes the objective that is to be

 Condition A condition that must be met if an action

>, 1, 2, ... Step Carry out steps. Where steps are

Text Display text Text appears on the instrument display.

Button

- Result Denotes the result of a previous step.

 Cross -reference Refers to more extensive or detailed

Control button Press the button.

achieved via the steps described. Where
steps are numbered, you must always
follow the order given!

is to be carried out as described.

numbered, you must always follow the
order given!

information.

1. Safety advice 3

1. Safety advice

This chapter gives general rules which must be followed
and observed if the product is to be handled safely.

Avoid personal injury/damage to equipment

> Do not use the measuring instrument and probes to

measure on or near live parts.

> Never store the measuring instrument/probes together

with solvents and do not use any desiccants.

Product safety/preserving warranty claims

> Operate the measuring instrument only within the

parameters specified in the Technical data.

> Always use the measuring instrument properly and for its

intended purpose. Do not use force.

> Do not expose handles and feed lines to temperatures in

excess of 70 °C unless they are expressly permitted for
higher temperatures.
Temperatures given on probes / sensors relate only to
the measuring range of the sensors.

> Open the instrument only when this is expressly

described in the documentation for maintenance and
repair purposes.
Carry out only the maintenance and repair work that is
described in the documentation. Follow the prescribed
steps when doing so. For safety reasons, use only
original spare parts from Testo.

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Ensure correct disposal

> Take faulty rechargeable batteries/spent batteries to the

collection points provided for them.

> Send the product back to Testo at the end of its

useful life. We will ensure that it is disposed of in an
environmentally friendly manner.

2. Intended purpose4

2. Intended purpose

This chapter gives the areas of application for which the
product is intended.

Use the product only for those applications for which it was
designed. Ask Testo if you are in any doubt.

testo 112 is a compact, accurate measuring instrument for
measuring temperatures by means of plug-in temperature
probes. Thanks to the possibility of connecting not only
NTC probes, but also Pt100 probes, the testo 112 covers
a wide measurement range and at the same time provides
a high level of measurement accuracy.

The following components of the product are designed for continuous
contact with foodstuffs in accordance with the regulation
(EC) 1935/2004:
The measurement probe up to 1 cm before the probe handle or the
plastic housing. If provided, the information about penetration depths
in the instruction manual or the mark(s) on the measurement probes
should be noted.

The product was designed for the following tasks/
applications:

· Food sector

· Laboratories

· Applications requiring official calibration (only relevant for
Germany):

The testo 112 is approved for official calibration by
the Physikalisch-Technisches Institut PTB (national
metrology institute in Germany).

Approval mark:

The product should not be used in the following areas:

· Areas at risk of explosion

· Diagnostic measurements for medical purposes

3. Produktbeschreibung 5

3. Product description

This chapter provides an overview of the components of
the product and their functions.

3.1 Display and control
elements

Overview

 Infrared interface, probe socket
 Display
 Control buttons
 Battery compartment (rear)

Button functions

Button Functions

Switch instrument on;

switch instrument off (press and hold)

Switch display light on / off

Keep reading, display maximum/

minimum value

Open/leave configuration mode (press

and hold);
In configuration mode:
Confirm input

In configuration mode:

Increase value, select option

In configuration mode:

Reduce value, select option

Print data

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3. Production description6

Important displays

Display Meaning

Battery capacity (bottom right in display):

· 4 segments in the battery symbol are lit: Instrument battery is fully

· No segments in the battery symbol are lit: Battery is almost spent
Print function: Readings are sent to the printer
Upper alarm limit: Lit if exceeded
Lower alarm limit: Lit if undershot

charged

3.2 Interfaces

Infrared interface

Measurement data can be sent to a Testo printer via the
infrared interface on the head of the instrument.

Probe socket

A plug-in measuring probe can be connected via the probe
socket on the head of the instrument.

3.3 Voltage supply

Voltage is supplied by means of a 9V monobloc battery
(included in delivery) or rechargeable battery. It is not
possible to run the instrument from the mains supply or
charge a rechargeable battery in the instrument.

4. Commissioning 7

4. Commissioning

This chapter describes the steps required to commission
the product.

 Removing the protective film on the display:

> Pull the protective film off carefully.

 Inserting a battery/rechargeable battery:

1 To open the battery compartment on the rear of the

instrument, push the lid of the battery compartment in
the direction of the arrow and remove it.

2 Insert a battery/rechargeable battery (9V monobloc).

Observe the polarity!

3 To close the battery compartment, replace the lid

of the battery compartment in position and push it
against the direction of the arrow.

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99 Washington Street, Melrose, MA 02176
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5. Operation8

5. Operation

This chapter describes the steps that have to be executed
frequently when using the product.

5.1 Connecting a probe

Plug-in probes

Plug-in probes must be connected before the measuring
instrument is switched on so that they are recognised by
the instrument.

> Insert the connector of the probe into the probe

socket.

5.2 Switching the instrument
on / off

 Switching the instrument on:

> Press .

- A segment test is carried out: All LCD-segments in
the display briefly light up.

- A function test of the instrument and the probe
is carried out. The instrument tests the entire
measurement channel regarding the adherence to
allowed margins of error.
The type of probe attached is displayed for
approx.2s (NTC or Pt 100).

An error is detected:

- rEF Error is displayed for approx. 2s, then ----- is
displayed. Please contact your dealer or Testo
customer service.

The function test was successful:

- Measurement view is opened: The current reading
is displayed.

5. Operation 9



Switching the instrument off:

> Press and hold (for approx. 2s) until the display

goes out.

5.3 Switching the display
light on / off

 Switching the display light on/off:

 The instrument is switched on.

> Press .

5.4 Performing settings

1 To open configuration mode:

 The instrument is switched on and is in measurement

view. Hold, Max or Min are not activated.

> Press and hold (for approx. 2s) until the display

changes.

- The instrument is now in configuration mode.

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You can change to the next function with .

You can leave configuration mode at any time. To do
so, press and hold (for approx. 2s) until the
instrument has changed to measurement view. Any
changes that have already been made in configuration
mode will be saved.

2 To set the alarm function:

 Configuration mode is opened, ALARM is lit.

1 Select the desired option with / and confirm

with :

· oFF: Switches the alarm function off.

· on: Switches the alarm function on.

oFF was selected:

 Continue with objective TO SET THE MAX./MIN. PRINT

FUNCTION.

5. Operation10

on was selected:

2 Use / to set the value for the upper alarm

threshold (

3 Use / to set the value for the lower alarm

) and confirm with .

threshold ( ) and confirm with .

3 To set the max./min. print function:

 Configuration mode is opened, MaxMin is flashing.

> Select the desired option with / and confirm

with :

· on: Maximum and minimum values are printed out

as well when current or recorded readings are
printed.

· oFF: Maximum and minimum values are not printed

out as well when current or recorded readings are
printed.

4 To set Auto Off:

 Configuration mode is opened, AutoOff is flashing.

> Select the desired option with / and confirm

with :

· on: The measuring instrument switches off
automatically if no button is pressed for 10min (Hold
or Auto Hold is lit).

· oFF: The measuring instrument does not switch
itself off automatically.

5 To set the date/time:

 Configuration mode is opened, YEAR is lit.

1 Use / to set the current YEAR and confirm

with .

2 Use / to set the other values for the month

(MONTH), day (DAY) and time (TIME) and confirm each
one with .

5. Operation 11

6 To set the unit of measurement:

 Configuration mode is opened, UNIT is lit.

> Select the desired unit of measurement with /

and confirm with .

7 To reset:

 Configuration mode is opened, RESET is lit.

> Select the desired option with / and confirm

with :

· no: Instrument is not reset.

· Yes: Instrument is reset. The instrument is reset to

the factory settings.
The setting of date / time is not reset.

- The instrument returns to measurement view.

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6. Measuring12

6. Measuring

This chapter describes the steps that are required to
perform measurements with the product.

 Taking a measurement:

 The instrument is switched on and is in measurement

view.

> Put the probe in position and read off the readings.

With the alarm function on and if the alarm threshold
is exceeded or undershot:

-

or flashes and a signal tone is given.

- The alarm goes out if the reading goes below the
upper or above the lower threshold again.

 Holding the reading, displaying the maximum/minimum

value:

The current reading can be recorded. The maximum and
minimum values (since the instrument was last switched
on) can be displayed.

> Press several times until the desired value is

displayed.

- The following are displayed in turn:

· Hold: the recorded reading

· Max: Maximum value

· Min: Minimum value

· The current reading

- In addition to the maximum or minimum readings,

nd

reading line shows the current reading.

the 2

6. Measuring 13



Resetting the maximum/minimum values:

The maximum/minimum values of all channels can be
reset to the current reading.

1 Press several times until Max or Min lights up.

2 Press and hold (approx. 2s).

- All maximum or minimum values are reset to the
current reading.

 Printing readings:

The readings shown on the display (current reading,
recorded reading or max./min. reading) can be printed
out.
A Testo printer is required (accessory part).

With the Max./Min. print function switched on, the

maximum and minimum values are printed out as well
as the current reading or recorded reading.

 See the chapter PERFORMING SETTINGS.

1 Configure the instrument so that the value to be

printed is shown on the display.

2 Press .

- The printout starts. On the printout appears:

· The measurement value

· The date and time

Only relevant for applications requiring official
calibration in Germany:

· A protocol line with the text:

Der ausgedruckte Messwert stimmt mit der Anzeige
des geeichten Messgeräts überein. (The printed

measurement value corresponds to the display
of the officially calibrated measuring instrument.)

· A signature line

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7. Care and maintenance14

7. Care and maintenance

This chapter describes the steps that help to maintain the
functionality of the product and extend its service life.

 Cleaning the housing:

> Clean the housing with a moist cloth (soap suds) if

it is dirty. Do not use aggressive cleaning agents or
solvents!

Changing the battery/rechargeable battery:

 The instrument is switched off.

1 To open the battery compartment on the rear of the

instrument, push the lid of the battery compartment in
the direction of the arrow and remove it.

2 Remove the spent battery/rechargeable battery and

insert a new battery/rechargeable battery
(9 V monobloc). Observe the polarity!

3 To close the battery compartment, replace the lid

of the battery compartment in position and push it
against the direction of the arrow.

8. Questions and answers 15

8. Questions and answers

This chapter gives answers to frequently asked questions.

Question Possible causes Possible solution

is lit (bottom right · Instrument battery is · Replace instrument

in display). almost spent. battery.
Instrument switches ·

itself off automatically. is switched on.

Display:

----- · Probe is not plugged in. · Switch instrument off,

Display reacts slowly · Ambient temperature · Raise ambient

Display:

uuuuu · Permitted measuring · Keep to permitted

Display:

ooooo · Permitted measuring · Keep to permitted

Display:

rEF Error · Reference measurement · Please contact your

Auto Off function · Switch function off.

· Residual capacity · Replace battery.
of battery is too low.

connect probe and
switch instrument
back on again.

· Probe break. · Please contact your

dealer or Testo
Customer Service.

is very low. temperature.

range was undershot. measuring range.

range was exceeded. measuring range.

out of tolerance of dealer or Testo

±0.1°C Customer Service.

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9. Technical data16

9. Technical data

Instrument

Characteristic Value

Parameters Temperature (°C / °F)
Measuring range Pt100 probe: -50...+300°C / -58...+572 °F

Resolution 0.1 °C / 0.1 °F
Accuracy
Probe 1x mini DIN socket for Pt100 or NTC temperature probe
Measuring rate 2/s
Operating temperature range -20...+50 °C / -4...+122 °F
Storage temperature -30...+70 °C / -22...+158 °F
Voltage supply 1x 9 V monobloc battery/rech. battery
Battery life approx. 70 h
Protection class with TopSafe (accessory part) and probe connected: IP 65
EC Directive 2014/30/EC
Warranty 2 years

System accuracy

Measuring range Instrument Probe System

Measuring instrument + NTC temperature probe

-50.0°C...-25.1°C ±1% of reading ±0.7% of reading ±1.8% of reading

-25.0...+40.0°C ±0.2°C ±0.2°C ±0.5°C
+40.1...+80.00°C ±0.3°C ±0.4°C ±0.8°C
+80.1...+120.0°C ±0.5°C ±0.6°C ±1.2°C

Measuring instrument + Pt100 temperature probe

-50.0...-25.1°C ±0.2°C ±0.3°C ±0,6°C

-25.0...+40.0°C ±0.2°C ±0.2°C ±0.5°C
+40.1...+140.0°C ±0.2°C ±0.4°C ±0.7°C
+140.1...+200.0°C ±0.2°C ±0.6°C ±0.9°C
+200.1...+300.0°C ±0.3°C ±0.8°C ±1.2°C

NTC probe: -50...+120°C / -58...+248 °F

 See SYSTEM ACCURACY

10. Accessories / spare parts 17

Declaration of Conformity

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18

10. Accessories/spare
parts

Name
Part no.

NTC probes

Water-proof NTC immersion/penetration probe 0613 1212
Water-proof NTC surface probe for smooth surfaces 0613 1912
Efficient, robust air probe, NTC 0613 1712
Stainless steel NTC food probe, calibratable 0614 2211
Robust NTC food pentration probe with special handle, calibratable 0614 2411

Pt100 probes

Robust, water-proof Pt100 immersion/penetration probe 0609 1273
Efficient, robust air probe, Pt100 0609 1773

Miscellaneous

TopSafe testo 112, protects from impact and dirt particles 0516 0221

Test Equipment Depot - 800.517.8431
99 Washington Street

, Melrose, MA 02176

TestEquipmentDepot.com

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