TESTO 312-4 User manual

testo 312-4 · Pressure measuring instrument
Instruction manual

2

1 Contents
3
1Contents
1Contents ...................................................................................................3
2Safety and the environment....................................................................5
2.1. About this document ........................................................................5
2.2. Ensure safety...................................................................................6
2.3. Protecting the environment..............................................................6
3Specifications ..........................................................................................7
3.1. Use ..............................................................................................7
3.2. Technical data .................................................................................8
4Product description.................................................................................9
4.1. Overview..........................................................................................9
4.1.1. Control elements and connections...................................................................9
4.1.2. Display .........................................................................................................10
4.1.3. Menu overview...............................................................................................12
4.2. Basic properties.............................................................................13
5First steps ..............................................................................................14
6Using the product ..................................................................................15
6.1. Performing settings........................................................................15
6.1.1. Location .........................................................................................................16
6.1.2. Memory .........................................................................................................16
6.1.3. Instrument......................................................................................................18
6.1.4. Service .........................................................................................................19
6.1.5. Input .........................................................................................................21
6.1.6. Gas type ........................................................................................................23
6.2. Measuring......................................................................................23
6.2.1. Important information for pressure measurement...........................................23
6.2.2. Connection variations ....................................................................................24
6.2.3. Zeroing the display ........................................................................................26
6.2.4. Save readings/implement measurement program..........................................27
6.2.5. Print readings.................................................................................................28
6.2.6. Activate measuring functions .........................................................................28
6.3. Perform measurement procedures ................................................29
6.3.1. Pretest/main test, high pressure at water pipes .............................................29
6.3.2. Leak rate/usability after pressure drop ...........................................................31

1 Contents
4
7Maintaining the product ....................................................................... 33
8Tips and assistance .............................................................................. 34
8.1. Questions and answers ................................................................ 34
8.2. Accessories and spare parts......................................................... 34

2 Safety and the environment
5
2Safety and the environment
2.1. About this document
Use
> Please read this documentation through carefully and
familiarize yourself with the product before putting it to use. Pay
particular attention to the safety instructions and warning advice
in order to prevent injuries and damage to the products.
> Keep this document to hand so that you can refer to it when
necessary.
> Hand this documentation on to any subsequent users of the
product.
Symbols and writing standards
Representation Explanation
Warning advice, risk level according to the
signal word:
Warning! Serious physical injury may occur.
Caution! Slight physical injury or damage to
the equipment may occur.
> Implement the specified precautionary
measures.
Note: Basic or further information.
1. ...
2. ...
Action: more steps, the sequence must be
followed.
> ... Action: a step or an optional step.
- ... Result of an action.
Menu Elements of the instrument, the instrument
display or the program interface.
[OK] Control keys of the instrument or buttons of
the program interface.
... | ... Functions/paths within a menu.
“...” Example entries

2 Safety and the environment
6
2.2. Ensure safety
> Only operate the product properly, for its intended purpose and
within the parameters specified in the technical data. Do not
use any force.
> The objects to be measured or the measurement environment
may also pose risks: Note the safety regulations valid in your
area when performing the measurements.
> Do not perform contact measurements on non-insulated, live
parts.
> Do not store the product together with solvents. Do not use any
desiccants.
> Carry out only the maintenance and repair work on this
instrument that is described in the documentation. Follow the
prescribed steps exactly. Use only original spare parts from
Testo.
> Temperatures given on probes/sensors relate only to the
measuring range of the sensors. Do not expose handles and
feed lines to any temperatures in excess of 70 °C unless they
are expressly permitted for higher temperatures.
2.3. Protecting the environment
> Dispose of faulty rechargeable batteries/spent batteries in
accordance with the valid legal specifications.
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
regulations) or return the product to Testo for disposal.

3 Specifications
7
3Specifications
3.1. Use
The testo 312-4 is a handy pressure measuring instrument that was
developed specifically for use in heating system installations.
The main areas of use and measuring tasks are:
Gas pipes
• Performance of the pretest in acc. with DVGW-TRGI 2008
• Performance of the main test in acc. with
DVGW-TRGI 2008
• Determining the usability by means of pressure drop method
• Pressure regulation testing incl. recording readings up to 24 h
• Monitoring of gas connection pressure at gas meter
• Monitoring of gas flow pressure at gas meter
• Setting the nozzle pressure for setting gas burners/heaters
Water pipes
• Leak test of wastewater disposal lines in acc. with DIN EN 1610
• Performance of load tests up to 25 bar at drinking water
systems
Data transfer
• Printout via testo IR standard printer
• Data transfer to Easyheat PC software
The instrument offers the following characteristics:
• Measurement location management
• Data management via Easyheat software
• "On-site" printout of the measurement results via the testo
protocol printer
• Temperature measurement
• Wide range of probes and sensors can be connected so that
one instrument covers as many measuring tasks as possible

3 Specifications
8
3.2. Technical data
Characteristic Values
Measuring ranges and
accuracies
0 to 3 hPa: ±0.03 hPa
3 to 40 hPa: ±1.5 % of m.v.
41 to 200 hPa: ±2 hPa
Intrinsic leakage 0.3 % pressure drop from test
pressure over a period of 1 minute
Permissible media Air, non-aggressive gases
Voltage supply 9 V monobloc (6LR61), alkaline
manganese or 12 V DC mains unit
Sensor interface Round 8-pin plug
PC interface Serial, connection line 0409 0178
Printer interface Infrared
Measurement data
memory
approx. 25000 readings
Battery running time in
continuous operation
with internal pressure
sensor
30 h with alkali manganese at 25 °C /
77 °F
Sensor piezoresistive
Storage/transport
temperature
-20 to 70 °C/-4 to 158 °F
Operating temperature 0 to 50 °C/32 to 122 °F
Weight (incl. TopSafe
and battery)
approx. 600 g/1 lb 5 oz
Housing material ABS
Dimensions (L x W x H) 219 x 68 x 50 mm/8.5" x 2.5" x 2"
Measuring rate Auto: 1 sec to 24 h, quick: 0.04 sec
Adaption time 10 min
Refresh rate of display 2/sec, with rapid measurement: 4/sec
Warranty 24 months, warranty conditions: See
web page www.testo.com/warranty
EC Directive 2014/30/EC

4 Product description
9
4Product description
4.1. Overview
4.1.1. Control elements and connections
1IR interface for protocol printer
2Keyboard
Key Function
Print
Select reading 1 (top line), select menu item
Switching on/off
Saving data
Open menu level, confirm selection, execute
function
Zero pressure probes
Cancel process, menu level back
Select reading 2 (bottom line), select menu item

4 Product description
10
Key Function
Keep reading, display maximum/minimum/mean
value
3 Battery compartment (on rear)
4 Connections
Connection Function
1 Socket 1: Thermocouple probe
(type K), NTC probe, pressure probe
2 Socket 2: Thermocouple probe
(type K), NTC probe, pressure probe
RS 232 PC connection
12 V DC 12 V DC mains unit (0554 0088)
+ Pressure nipple with quick-release connection
- Pressure nipple with quick-release connection
4.1.2. Display

4 Product description
11
1Status information
Icon Function
Counter for identifying the stored protocols in the
case of manual, automatic and fast storage of
the measurement series.
Counter for identifying the measurement data in
a measurement series in the case of automatic
and fast storage.
Lights up: manual saving set.
Flashes: current readings saved.
Lights up: automatic saving set.
Flashes: automatic saving running.
The memory content will be cleared.
Lights up: printing possible.
Flashes: print function activated.
Rechargeable battery/battery charge level. The
black segments go out with a decreasing
residual capacity
Flashes: Battery/rechargeable battery empty.
Instrument switches itself off within 1 min.
2Description of internal sensor (i), external pressure probe / input
socket (P1), external temperature probe / input socket (T1),
differential value Δp(P2 - P1) or Δt (T2 - T1) and measurement
parameter unit.
3Reading 1
4Description of external pressure probe / input socket (P1 or P2),
external temperature probe / input socket (T1 oder T2) and
measurement parameter unit.
5Reading 2
6Measuring functions

4 Product description
12
4.1.3. Menu overview
The menu is organized into up to 3 levels, depending on the
function.
Level 1 Level 2 Level 3
1 Measurements 11 Pretest -
12 LeakRate -
13 Maintest -
2 Location - -
3 Memory 31 Man/Auto -
32 Config. -
33 Print -
34 Status -
35 Delete -
4 Instrument 41 Time -
42 Auto Off -
43 Units 431 P Low
432 P High
433 ISO/US
434 °C/°F
5 Service 51 Data -
52 Language -
53 Bat.type -
54 F-Reset -

4 Product description
13
Level 1 Level 2 Level 3
6 Input 61 Pretest 611 Stabtime
612 Meastime
613 Finish
62 LeakRate 621 Stabtime
622 Meastime
623 Finish
63 Maintest 631 Stabtime
632 Meastime
633 Finish
64 Pref -
65 Volume 651 Circle 1
652 Length1
653 Circle 2
654 Length2
655 Circle 3
656 Length3
657 Finish
66 Pabs -
7 Gas type - -
4.2. Basic properties
Voltage supply
The power can be selectively supplied to the testo 312-4 via:
• 9 V monobloc battery, type: IEC 6LR61 (included in delivery)
• 9 V monobloc rechargeable battery, type: NiMH IEC 6F22
(0515 0025)
• Mains unit (0554 0085)
With an attached mains unit the power is supplied automatically via
the mains unit and the instrument's rechargeable battery is charged
(only at ambient temperature: 0 to 45 °C).
Charging the instrument's rechargeable battery is also possible
using a charging adapter (0554 0025) available as an accessory.

5 First steps
14
5First steps
Insert battery/rechargeable battery.
To avoid the loss of data, it is imperative that you switch
the instrument off when changing the
battery/rechargeable battery and replace the battery
within 10 min.
1. Open the battery compartment on the rear of the instrument.
2. Insert monobloc/rechargeable battery (observe the polarity!)
3. Close the battery compartment.
Connecting probes / sensors
Connect the probes/sensors before switching the instrument on.
Sensor-specific characteristics are only read in when the
instrument is switched on. Make sure the connections are secure,
but do not use force!
> Connect thermocouple probe (type K), NTC probe, pressure
probe at socket 1and socket 2.
> Connect pressure tubes to +and -.
Caution! Danger of injury caused by the pressure tube
jumping away from the connection socket!
> Ensure correct connection.
External probes/sensors have priority over the internal
sensors during recording of readings. A maximum of 2
measurement channels is shown.
> Only connect external probes/sensors if you require
these for the respective measuring task.
Switching on
Connect the required probes/sensors before switching
on.
1. Switch the instrument on using .
- A display test will follow: All segments of the display light up for
around 1 sec.
- Automatic probe detection will be carried out. The supply
voltage and the current time will be displayed.

6 Using the product
15
For the initial commissioning or after a factory reset, the Language
function is automatically opened. Set the required menu language:
> Select the language with or and confirm with .
- The current readings are displayed. The instrument is now
operational.
The reading of the internal sensor is displayed in the
upper line.
The reading of an externally connected probe appears
in the lower line.
If two probes are connected externally, the
measurement of the internal sensor is deactivated.
• Left probe socket: upper line
• Right probe socket: lower line
• Δp: With or , calculated differential
pressure (pressure/temperature) is displayed.
Switching off
Unsaved readings are lost when the instrument is
switched off.
> Switch the instrument off with .
6Using the product
6.1. Performing settings
Menu navigation
1. Press to open the main menu.
2. Select the menu with or and confirm the selection
with .
3. Repeat operating step 2 until you reach the function level.
> You can make entries with or depending on the
menu item. Confirm the entry with .
> Go back one menu level with .

6 Using the product
16
6.1.1. Location
1. Use or in main menu to select Location.
2. Use to activate setting mode.
- The location that is currently set will be displayed. If a location
designation was assigned by the Easyheat software, this is also
shown.
- If data is already stored for the chosen location, is shown.
3. Use or to select the desired location.
To enter a new location:
> Press the key until NEW appears in the lower line.
A location is created when the unit is first
commissioned. Up to 98 additional locations can be
added.
4. Confirm the selection with .
6.1.2. Memory
1. Use or in main menu to select Memory and confirm
selection with .
2. Use or to select the desired save mode.
3. Use to activate setting mode.
Man/Auto
1. Use or to select manual, automatic or fast and
confirm the selection with .
• Manual: The current reading is saved by pressing in
the measurement view.
• Automatic: A measurement program is started by pressing
in the measurement view. Readings can be recorded
over max. 24 hours with the automatic measurement
program (measuring rate: 1 second).

6 Using the product
17
• Fast: 25 measurements are automatically recorded per
second by pressing in the measurement view. A fast
measurement is only possible with pressure probes or an
internal pressure sensor. Only 1 channel can be evaluated
and the following sequence applies: external pressure
sensor before internal pressure sensor, channel 2 before
channel 1.
Configuration
Set Auto measurement program (if the function Manual or
Automatic was selected under Man/Auto):
1. Set measuring rate using or . Hold the key down to go
forward/back quickly.
2. Confirm the selection with .
3. Set number of measurements using or . Hold the key
down to go forward/back quickly.
- The duration of the measurement series is displayed in the
upper line for your information.
4. Confirm the selection with .
Set Fast measurement program (if the function Fast was selected
under Man/Auto):
1. Select number of measurements using or . Hold the
key down to go forward/back quickly.
2. Confirm the selection with .
Print
The protocols recorded for a location such as reading or other
available parameters (density, temperature, humidity, pressure,
section, offset factor, Pitot tube factor) can be printed.
- If no protocol is recorded, Error is shown in the display.
1. Use or to select the protocol. Hold the key down to
go forward/back quickly.
2. Confirm the selection with .
- The data is sent to the printer via the infrared interface.
flashes during the data transfer.

6 Using the product
18
Status
Indicates the available memory space as a %.
Delete
The complete memory content can be erased. It is not possible to
erase individual protocols or locations.
> Select Yes or No using or and confirm selection with
.
• If you select Yes: The memory content will be erased.
• If you select No or : the process will be cancelled.
6.1.3. Instrument
1. Use or in main menu to select Device and confirm
selection with .
2. Select the required function/menu with or and
confirm with .
3. Use to activate setting mode.
Time
Time and date can be set.
1. Set hour with or (hh). Hold the key down to go
forward/back quickly.
2. Confirm the setting with .
3. Repeat steps 1 and 2 for the other values.
Auto off
An automatic switch-off function can be activated/deactivated.
1. Select On or Off with or and confirm selection with
.
• On: The instrument switches off automatically if no key is
pressed for 10 minutes.
• Off: The instrument does not switch off automatically.

6 Using the product
19
Unit
The units of the parameters can be set. Which units are available
depends on the selected setting under ISO/US:
• ISO: Pa, hPa, mbar, kPa, bar, psi, mmWS, Torr
• US: Pa, hPa, mbar, kPa, bar, psi, InW, InHg
The following parameter assignments are possible:
• P Low (low pressure): Unit for measurements with the internal
pressure sensor (up to 200 hPa) and external differential and
absolute pressure probes (up to 25 bar).
• P High (high pressure): Unit for measurements with external
relative pressure probes with measuring range (1 to 25 bar).
• °C/°F (temperature).
1. Select ISO/US with or and confirm the selection with
.
2. Select ISO or US with or and confirm selection with
.
3. Select P Low, P High or °C/°F with or and confirm
selection with .
4. Select the units with or and confirm the selection with
.
> If needed, repeat steps 3 and 4 for other parameter
assignments.
6.1.4. Service
1. Use or in main menu to select Service and confirm
selection with .
2. Select the required function/menu with or .
3. Confirm the selection with and selected the desired
function with or .
4. Use to activate setting mode.
Data
Battery voltage and firmware version are shown.
> Press to print all instrument data.

6 Using the product
20
Language
The instrument menu language can be set.
The following languages are available:
> Select the desired language with or and confirm the
selection with .
Bat. type
The battery type that is used can be set.
The battery can only be recharged in the instrument if a
rechargeable battery is inserted and the battery type is
set to RechBatt. Only set the battery type to RechBatt
if a rechargeable battery is actually fitted in the
instrument.
> Select Battery or RechBatt using or and confirm
selection with .
Factory reset
The instrument settings can be reset to the condition on delivery
(factory settings).
Caution: The entire memory is erased when a factory
reset is performed.
The following functions are reset:
Function Setting after factory reset
Auto off On
Stabilization time 5’
Measuring time 10’
Reference pressure 22hPa
Volume
circle 1
length 1
circle 2
length 2
circle 3
length 3
0.00 l
0 mm
0.00 m
0 mm
0.00 m
0 mm
0.00 m
Absolute pressure 1013 hPa
Units ISO