TESTO 312, 312-2, 312-3 Instruction Manual

testo 312 - 2/3

Instruction manual

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Introduction2

Initial operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Diagram of instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Operating the instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Measurement example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Switching on instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Differential pressure measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Fine pressure/Draught measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Connection options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Pre-test / Main test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Service ability test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Setting alarm limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Setting date/time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Setting timer for printout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Setting number of printouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Changing the units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Changing rechargeable battery or battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Ordering data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Pressure transducer (Accessories). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Dear Customer

You have made the right decision by purchasing testo 312.

testo 312 is designed to adjust and maintain gas heating systems.

Thousands of customers buy our high standard products every year. There are at least 7 good
reasons for doing so.

1) Cost-performance ratio. Reliable quality at a fair price.

2) Extended warranty times of up to 3 years - depending on instrument!

3) We have the ideal solutions for your measuring tasks based on our expert experience gained
over 40 years.

4) Our high quality standard is confirmed by the ISO 9001 certificate.

5) Of course, our instruments carry the CE symbol required by the EU.

6) Calibration certificates for all relevant parameters. Seminars, advice and calibration on location.

7) Our after-sales service. Contact us for more information.

Contents

Introduction

2

Instrument conforms with 2004/108/EEC

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No reading in display?
Send instrument for service.

Function test

for both pressure nipples

Warnings

Safety instructions

Initial operation

3

Capacity display

Voltage >7.2 V
Life of rechargeable battery: approx. 5 h
Life of battery: approx. 15 h
(at an ambient temperature of 20°C)

Flashing symbol, voltage: <7.2 V
Life of rechargeable battery: approx. 15 min.
Life of battery: approx. 45 min.
If the rechargeable battery voltage drops below

6.7 V automatic switch-off follows as protection
against total discharge.

Low Bat

++

Function check/Leak check

Prior the commencing any testing the complete
measuring system (intrument, probe and hoses) should
be checked for leaks

Temperature influence on the leak test

During any leak tests the ambient temperature must
remain constant to obtain valid data.

Instrument should only be used by trained personnel.

Always adhere to any system safety instructions and
never use the equipment in an explosive environment.

Under normal operating conditions gas will not escape
from the instrument when connected to the gas pipe /
system under test.

The instrument is not designed to operate while wet, or
in an environment of condensing humidity

The instrument should only be used in the conditions
and for the purposes for which it was constructed.
Please take particular note of the safety instructions
and the technical data.

The instrument should only be used in the operation and
measurement ranges specified in the technical data.

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Initial operation

4

Symbol for alarm

On/Off

Print

Battery capacity

Start

measurement/

Freeze readings

Print button

Cancel/Restore

Audible alarm
On/Off button

Alarm levels

Parameters

Parameters

Measuring units

Measuring units

Date/Time

On/Off button

OK button

Scroll buttons

Time

Pressure

connection

Freeze readings

Parameters

Readings

Diagram of instrument

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Initial operation

5

Operating the instrument

Keypad

- Scrolling buttons

Using the arrow buttons / you can scroll
between the parameters, digits in date/time and the alarm
limits can be set.

- Selection button

In the date/time and alarm limits menu, access to the
variable parameters is via the arrow button pointing to the
right .
The units can also be changed. The parameters are set
using the up and down buttons.

- Printing

All of the saved readings can be printed on the printer by
pressing Print .

- I/O button

The instrument is switched on or off via the I/O button

. The display switches off automatically after 5
seconds once the instrument is switched off. This can be
prevented by pressing any button. The instrument then
goes to the Δp measurement menu.
The readings in the display are usually lost when the
instrument is switched off.

- Cancel button

The Cancel button is used to cancel a selected
process or to leave a sub-menu.

- OK button

The changed parameters are saved by pressing .

- START/HOLD button

Start measurement by pressing . The displayed

readings are frozen by pressing again

.

- Alarm on/off button

Switches audible signal on or off.

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Self-test

Press button. Displays all segments for
approx. 3 seconds.

Battery capacity / Instrument version (2 digit)

Displays battery/rechargeable battery voltage
and instrument version for approx. 3 seconds.

Instrument version (3 digit)

If the button is pressed within 3 seconds
the version number is shown in 3 digits. You then
go to the measurement menu.

Instrument switches off

6

9.0

08:38

--------

1.0

Self-test

Measurement menu

Display for

battery

capacity /

instrument version

9.0

1.00

Instrument

version

Connect hose.

3 s

3 s

5 s

3 s

Measurement example: testo 312-2/-3

Switching on instrument

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7

08:38

2

09:15

13.0

08:38

-----

Measurement

menu

Switch on
instrument

Wait on calibration
phase (5 s)

Save reading.
HOLD appears in
display.

The saved readings can
be printed.

Position pressure
measurement hose. The
reading appears in the
display.

Start measurement

- Segment test (3 s)

- Voltage display (3 s)

(see page 6)

8

7

09:15

13.0

6

5

3

2

4

9

Measurement example: testo 312-2/-3

Differential pressure measurement

Connect
pressure

measuring

hose

testo 312-2: Range: 0 to 200 hPa. Resolution: 0.1 hPa
testo 312-3: Range: 0 to 6000 hPa. Resolution: 1 hPa

1

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8

5

152

--

08:38

-----

Measurement

menu

08:38

-----

Measurement

menu

Measurement
menu selection
with arrow
button.

Switch on
instrument.

- Segment test (3 s)

- Voltage display (3 s)

(See page 6)

- Function check

(See page 7)

3

2

1

4

09:25

2

09:25

- 0.24

Wait on calibration
phase (5 s)

Save reading.
HOLD appears in the
display

The saved readings
can be printed.

Position probe in flue
gas duct. The reading
appears in the display.

Start measurement.

9

8

7

6

10

Measurement example: testo 312-2

Fine pressure / Draught measurement

Connect
probe.

09:25

13.0

testo 312-2: ΔP range 0 to 40 hPa. Resolution: 0.01 hPa
testo 312-3: ΔP range 0 to 300 hPa. Resolution: 0.1 hPa

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9

Testing

pump

Balloon

pump

Compressor Inert gas

Connection hose

High pressure
stepped plugs

Conical

test plugs

Single-pipe

counter cap

JunctionMini valve

Connect pressure transducer
directly to instrument. Do not

use extensions. Apply

pressure.

Remove pressure from pipe

before detaching pressure

transducer from instrument.

Connection options

Measurement example: testo 312-2/-3

Suitable for:

- Pre-test

- Main test

- Testing service ability

- Checking pressure in
water pipelines

Observe maximum pressure

range.

Positive pressure destroys the

instrument.

Pressure

drop set

Pressure transducer (for liquid
substances); Refer to instructions
on page 22.

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3

2

1

4

5

Insert single­pipe counter
cap and
tighten.

Example

Manual printout
triggers an
automatic
printout after 10
minutes.

6

Pre-test / Main test

Measurement example: testo 312-2/-3

10

Switch on
instrument.

Start measurement
with START/HOLD
button.

Ensure
connection is
correct.

Connect
pressure drop
set and

testo 312.

Compare
printouts
OK/not OK

Build up test
pressure

Carry out function test! Gas should not
get into the instrument when carrying
out measurements on gas pipes.

Pressure drop

The complete measuring system
(instrument, probe, hoses and connec-

tions) should be checked for a drop in

pressure e.g. using pressure drop test

set by attaching the single-valve stop.

Preliminary test

Pipes are checked, without fittings, with a
test pressure of 1 bar. This pressure should
not fall during the 10-minute duration of
the test.

Main test

Pipes are checked, with fittings, with a
test pressure of 110 mbar. This pressure
should not fall during the 10-minute
duration of the test. The measuring
instrument should be able to recognise
a drop in pressure of 0.1 mbar.

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11

Start
measurement
with
START/HOLD
button.

3

2

1

4

5

Insert single­pipe counter
cap and
tighten.

Printout of initial
pressure

6

10

7

Switch on
instrument.

Ensure
connection is
correct.

Connect
pressure drop
set and
testo 312.

Freeze reading
with START/HOLD

Audible signal
after 1 min

8

9

Prints reading

Determines Δp

Build up test
pressure.

Use slide rule
to determine
what measure
to take

Measurement example: testo 312-2/-3

Service ability test

45

Carry out function test! Gas should not
get into the instrument when carrying
out measurements on gas pipes.

Pressure drop

The complete measuring system
(instrument, probe, hoses and

connections) should be checked for a

drop in pressure e.g. using pressure

drop test set by attaching the single-

valve stop.

Checking if fit for use

The pipe is pumped with air up to the
respective test pressure and the drop in
pressure in one minute is measured.

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12

08:54

-----

Measurement

menu

Switch on

instrument.

- Segment test (3 s)

- Voltage display (3 s)

(See page 6)

3

2

1

4

5

-----

--

Measurement
menu
selection via
arrow button.

08:54

-----

08:51

100.0

Increase or decrease
alarm limits via arrow
buttons.

Go automatically to
measurement menu.

Differential pressure

Draught

08:54

- 0.04

6

8

7

Note:

If the alarm limit has a value of 0.00 or 0.0,
the alarm of the corresponding alarm limit is
switched off. The dP or draught alarm is
inactivated following initialisation. Alarm
symbols do not appear on the display.
The alarm is deactivated by the manufacturer
i.e. the alarm limit is set at 0.00 or 0.0.
Press the alarm button once the alarm limit is
changed. The symbol is visible.

After the measurement, the flashing is a sign
that an alarm limit is set and was reached.

0 to 200 0 to 6000

0 to -40 0 to 300

testo 312-2

testo 312-3

Alarm setting range

Setting alarm limits

Differential pressure (testo 312-2/-3),

draught (testo 312-2)

Δ

P

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Setting date/time

08:34

-----

Measurement

menu

Switch on

instrument

- Segment test (3 s)

- Voltage display (3 s)

(See page 6)

3

2

1

5

4

6

Press and buttons
simultaneously.

Increase or
decrease digit
with arrow
buttons.
Return to
measurement
menu via OK

Increase or
decrease digit
with arrow
buttons. Press
OK button to
return to
measurement
menu

Increase or
decrease digit
with arrow
buttons. Press
OK button to
return to
measurement
menu

Setting the hour

08:35

-----

7

Press button.

Setting minutes

08:35

-----

Press button

Setting the day

02.06

-----

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14

Save selection with
OK button.
Return to
measurement menu
selection.

Note

You can leave the menu by pressing ESC
but the changes are not carried out.

8

Press button

Note:

The date display can be changed from
Day/Month (EUR) to Month/Day (US) by
pressing

.

Setting the month

02:06

-----

9

10

Press button.

Setting the year

1999

-----

Setting date/time

Increase or
decrease digit
with arrow
buttons. Press
OK button to
return to
measurement
menu.

Increase or
decrease digit
with arrow
buttons. Press
OK button to
return to
measurement
menu.

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15

08:34

-----

Measurement

menu

Switch on

instrument

- Segment test (3 sec.)

- Voltage display (3 sec.)

(See page 6)

3

2

1

5

4

Press button 2 sec.

Increase or
reduce value
using arrow
buttons.

7

Alarm limit

display

8

Press button.

9

Press button. Return to
measurement menu.

08:35

205

Timer

setting

6

08:35

00

Press button.

Increase or
reduce value
using arrow
buttons.

Timer

setting

08:35

05

Setting timer for printout

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16

7

Timer display

8

Press button

Alarm limit display

9

Press button

10

Press button. Return to
measurement menu.

Display timer

6

08:35

15

Press button

Increase or
reduce
number using
arrow buttons.

Set number of

printouts

08:35

2

Setting number of printouts

08:34

-----

Measurement

menu

Switch on

instrument

- Segment test (3 sec.)

- Voltage display (3 sec.)

(See page 6)

3

2

1

5

4

Press button 2 sec.

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17

Changing the units

1

2

3

4

Selection saved.
Return to measurement
menu.

You can leave the menu by pressing but
the changes are not made.

Press button

-

Measurement menu

Measurement
menu
selection with
arrow button.

Select units by pressing :

Differential pressure measurement

hPa, mbar, mmH

2

O, inchH2O

Draught measurement
hPa, mbar, mmH2O, inchH2O (testo 312-2 only)

08:57

- 20.4

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Phase Symbol Cause

General Low Bat is flashing Power to instrument is too low. If the

battery voltage drops below 6.7 volt, the
instrument switches off automatically.

T in top line is Non-permitted ambient temperature
flashing Adapt to ambient temperature.
The message Send instrument for service.
Exxx appears in the
bottom line

-- -- -- -- Pressure sensor is overloaded.

Error messages

18

Remove empty/defect rechargeable batteries or empty
batteries from the battery compartment and replace with
new ones.

Remove rechargeable batteries/batteries if the instrument
is not used for a longer period of time. If the battery cells
leak in the instrument, return instrument to factory to be
cleaned and checked.
Only the rechargeable batteries/batteries specified in the
technical data should be used.

Observe correct polarisation of rechargeable batteries or

batteries.

Instrument should only be used if the battery

compartment cover is closed.

Switch off instrument and disconnect from all

measuring circuits before changing the rechargeable

battery or battery.

Date and time are saved when the instrument is switched

off.

Maintenance

Changing the rechargeable battery or battery

1

2

3

4

old

new

If we were unable to answer your question, please contact your distributor or Testo
Customer Service. For contact data, see back of this document or web page
www.testo.com/service-contact

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19

testo 312

Technical data

testo 312-2

Measuring range* ±40 hPa ±200 hPa
Accuracy** <3.00 hPa ±0.03 hPa ±0.5 hPa (0 to 50 hPa)

>3.00 hPa ±1.5% of m.v.±1,5% of m.v. (>50 hPa)
Resolution ±0.01 hPa ±0.1 hPa
Alarm limit -0.01 to -40 hPa 0.1 to 200 hPa
Adjustment step 0.01 hPa 0.1 hPa
Alarm display Audible and optical
Max. overload 1 bar

Differential pressure measurement

Draught (testo 312-2 only)

testo 312-2

Measuring range* ±40 hPa
Accuracy** <3.00 hPa ±0.03 hPa

>3.00 hPa ±1.5% of m.v.
Resolution ±0.01 hPa
Alarm limit -0.01 to -40 hPa
Adjustment step 0.01 hPa
Alarm display Audible and optical
Max. overload 1 bar

testo 312-3

Measuring range* ±300 hPa ±6000 hPa
Accuracy** ±0.5 hPa <50 hPa ±4 hPa <400 hPa

±1.5% of m.v. ≥ 50 hPa ±2% of m.v. 400-2000 hPa

±4% of m.v. >2000 hPa
Resolution ±0.1 hPa ±1 hPa
Alarm limit 0.1 to 300 hPa 1 to 6000 hPa
Adjustment step 0.1 hPa 1 hPa
Alarm display Acoustic and optical
Max. overload 8 bar

Δ

P

General Technical data for testo 312-2 and testo 312-3

Storage temperature: -20 to +60 °C
Operation temperature: +5 to +45 °C
Dimensions: 215mm x 68mm x 47mm
Weight: Approx. 400 g

* Measuring instrument is temperature-compensated
** Accuracies do not apply in connection with pressure transducers

0554.3159 and 0554.3168

Warranty

Instrument: 2 years
Probes: 1 year
Accessories 6 months
Printer 1 year (excluding printing mechanism)

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20

testo 312

Ordering data

Description

Part no.

Instrument

testo 312-2 compact pressure gauge with

instruction manual and battery 0632.0313

testo 312-3 compact pressure gauge with
instruction manual and battery 0632.0314

Accessories

Testo printer, prints measurement data with location,

date and time 0554.0547

Spare rolls for printer 0554.0569
Rechargeable battery for printer (4 off) 0515.3120
Rechargeable battery 9V for instrument 0515.0025
Recharger for 9 V rechargeable battery 0554.0025
Recharger for printer 0554.0110
Pressure set with flue probe 0554.3150
TopSafe, indestructible protection case 0516.0443
Case 0516.0191
Service case 0516.3120
Pressure drop test set, 200 mbar 0554.3153
Test pump for pressure drop test set 0554.3157
Single-pipe counter cap 0554.3156
Two-valve junction 0554.3161
Single-valve stop 0554.3162
Connection hose LW6 0554.3158
Conical test plug 16-32mm 0554.3151
Conical test plug 24-44mm 0554.3155
Conical test plug 35-65mm 0554.3152
High pressure stepped plug 3/8” and 3/4” 0554.3163
High pressure stepped plug 1/2” and 1” 0554.3164
Complete high pressure set with case 0554.3160
Pressure transducer for liquid substances, 1 to 6000 mbar 0554.3159
Pressure transducer for liquid substances, 1 to 1000 mbar 0554.3168
System case 0554.3165
Leak detection spray 0554.3166
Slide rule 0554.3169
Test system set 0563.0314

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Normal use

The pressure transducer protects the testo 312
measuring instrument from moisture and high
temperatures: measures vapour and water pressure.

Measuring

Do not use an extension cable between the pressure
transducer and the instrument.

1 Connect connection A of the pressure transducer

directly to the instrument (+).

2 Switch on instrument.
3 Press “Start” and wait for calibration phase (5s).
4 Connect connection P of the pressure transducer

directly to the control pressure pipe.

Observe maximum pressure range of instrument and the
pressure transducer used!

5 Apply pressure to pipe.
6 Take readings.
7 Press “Hold”.
8 Remove pressure from pipe.
9 Disconnect pressure transducer from instrument.

Technical data

Connection size: ..........1/8” plug-in connection

Size

(Height/Diameter): ........33mm/64.8mm

Weight: ........................175g

Housing material:..........Aluminium

Pressure range: ............0-1bar (0554.3168)

....................................0-6bar (0554.3159)

Pressure loss: ..............0 to 6% of reading

Diaphragm: ..................Temperature resistant to 120°C,

....................................oil resisting

Overload:......................2bar (0554.3168)

....................................8bar (0554.3159)

Pressure transducer (Accessories)

Instructions

Connection

A

Connection P

21

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testo AG

Postfach 11 40, 79849 Lenzkirch
Testo-Straße 1, 79853 Lenzkirch

Telefon: [phone]
Fax: [phone]

E-Mail: [e-mail]
Internet: http://www.testo.com

0973 3124 en 02 V01.04 en_DE

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