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testo 312-4 · Pressure measuring instrument
Instruction manual
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2
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1 Contents
3
1 Contents
1 Contents ................................................................................................... 3
2 Safety and the environment .................................................................... 5
2.1. About this document ........................................................................ 5
2.2. Ensure safety ................................................................................... 6
2.3. Protecting the environment .............................................................. 6
3 Specifications .......................................................................................... 7
3.1. Use .............................................................................................. 7
3.2. Technical data ................................................................................. 8
4 Product 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
5 First steps .............................................................................................. 14
6 Using 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
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1 Contents
4
7
Maintaining the product ....................................................................... 33
8 Tips and assistance .............................................................................. 34
8.1. Questions and answers ................................................................ 34
8.2. Accessories and spare parts ......................................................... 34
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2 Safety and the environment
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2 Safety 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
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2 Safety and the environment
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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.
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3 Specifications
7
3 Specifications
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
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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
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4 Product description
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4 Product description
4.1. Overview
4.1.1. Control elements and connections
1 IR interface for protocol printer
2 Keyboard
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
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4 Product description
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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
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4 Product description
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1 Status 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.
2 Description 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.
3 Reading 1
4 Description of external pressure probe / input socket (P1 or P2),
external temperature probe / input socket (T1 oder T2) and
measurement parameter unit.
5 Reading 2
6 Measuring functions
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4 Product description
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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 -
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4 Product description
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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.
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5 First steps
14
5 First 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 1 and 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.
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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 .
6 Using 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 .
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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).
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• 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.
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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.
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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.
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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
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Function Setting after factory reset
Pressure unit hPa
Temperature unit °C
Battery type Battery
Language English
Save Manual
Gas type Natural gas
> Select Yes or No using or and confirm selection with
.
• If you select Yes: the factory reset will be performed.
• If you select No or
: the process will be cancelled.
6.1.5. Input
1. Use or in main menu to select Input and confirm
selection with .
2. Select the required function with
or .
3. Use to activate setting mode.
Pretest, LeakRate, Maintest
The stabilization time (slowdown time before the test time) and the
measurement period (test time) can be set for the pretest, leak rate
and main test measurement procedures.
1. Set the Stab(ilization)time with
or . Hold the key
down to go forward/back quickly.
2. Confirm the selection with .
3. Use
to activate setting mode.
4. Set the Meastime with
or . Hold the key down to go
forward/back quickly.
5. Confirm the selection with
.
6. Confirm Finish message with
.
Pref (reference pressure)
The reference pressure with which the measurement is to be
carried out can be set.
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1. Set reference pressure value using or . Hold the key
down to go forward/back quickly.
2. Confirm the selection with
.
- The instrument changes to the Volume function.
Volume
The performance volume is required for the measurement of
leakage rate.
Three circular diameters (in mm) and three pipe lengths (in m) can
be entered, from which three partial volumes can be calculated.
The performance volume is calculated by adding the three partial
volumes together.
1. Use
or to select Circle 1.
2. Confirm the selection with
.
3. Set value using or . Hold the key down to go
forward/back quickly.
4. Confirm the selection with
.
5. To set other values (Length 1 for first partial volume, Circle 2
und Length 2 for second partial volume, Circle 3 and Length
3 for third partial volume), perform steps 2. to 4. accordingly.
6. Confirm Finish message with
.
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Pabs (absolute pressure)
The absolute pressure that is used to calculate the density can be
set.
1. Set absolute pressure using
or . Hold the key down to
go forward/back quickly.
2. Confirm the selection with
.
6.1.6. Gas type
1. Use or in main menu to select Gas type.
2. Confirm the selection with .
3. Select Town gas, Nat gas or Air with
or .
4. Confirm the selection with
.
6.2. Measuring
6.2.1. Important information for pressure measurement
Temperature fluctuations and positional changes have an effect on
the accuracy of pressure measurements:
• The entire measuring system must be adapted to the ambient
temperature and to the temperature of the pipe system to be
tested.
• The temperature of the measuring system and the pipe system
must remain stable during measurement.
• The position of the measuring system must not change during
measurement.
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• Do not subject the housing to mechanical strains during
measurement.
Warning! Risk of explosion due to gas escaping from a
leaky measuring system!
> Check the complete measuring system for leaks
before any measurements at pipes carrying gas,
e.g. with pressure test set by plugging it into the
single-valve stop.
Caution! Damage to the sensoring technology in the
event of exceeding the permissible pressure.
> Do not subject the measuring instrument to
pressures > 200 hPa.
6.2.2. Connection variations
Typical connection variations for the measurement tasks that can
be performed with the instrument are shown below.
Micro-pressure, flue draught, differential pressure in
comparison to environment
1 Silicone hose
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Pretest and high pressure at water pipes
1 High-pressure probe
2 Pressure test set
3 High pressure stage stop
4 Compressor
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Main test, leak rate, regulator testing
1 Conical test stop
2 Pressure test set
3 Balloon pump
6.2.3. Zeroing the display
To zero the display of the internal pressure sensor, the instrument
must be in measurement view and there must be a differential
pressure of < ±2.5h Pa.
Please refer to the instruction manual of the pressure probe for the
zeroable range of the external pressure probes.
> Zero the display values of the internal pressure probe and all
connected (zeroable) pressure probes with
.
> Carry out the zeroing of the measurement system in operational
position.
- The zero value is retained until another zeroing is performed or
the device is switched off.
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6.2.4. Save readings/implement measurement program
For the readings to be saved, the instrument must be in the
measurement view. Depending on the set save mode, the save
process is performed differently:
Save mode Use
Manual
Retaining the current readings.
Automatic Saving the readings for an extended
period of time.
A typical application is testing a regulator,
for example. The saved readings can be
transferred to the EasyHeat PC software
and analyzed in graph form.
Fast Saving 25 readings per second to record
fast changes in pressure over a short
period.
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.
The saved readings can be transferred to
the EasyHeat PC software and analyzed
in graph form.
> Before you save the readings, you must select the location
under which the data is to be saved.
Manual save mode is set:
> Press
to save the current readings with the date, time,
location and other available parameters.
-
flashes briefly.
Automatic save mode is set:
> Press
to start the set measurement program.
-
flashes for as long as the measurement program is
running.
> The save program can be ended early by pressing
. Press
again to save a new series of measurements.
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Fast save mode is set:
1. Press to begin the measurement program.
- 25 measurements are automatically saved per second.
2. Press to end the measurement program.
6.2.5. Print readings
For individual readings to be printed, the instrument must be in the
measurement view.
> Press
to print the current readings with the date, time,
location and other available parameters.
- The data is sent to the printer via the infrared interface.
flashes during the data transfer.
6.2.6. Activate measuring functions
The instrument has the following measuring functions:
• Hold value (Hold): The last readings are held in the display.
• Display maximum value (Max.): The highest readings since the
start of measurement are displayed.
• Display minimum value (Min.): The lowest readings since the
start of measurement are displayed.
• Calculate multi-point mean (Mean●)
To call up the measuring functions, the instrument must be in the
measurement menu.
Hold, Max., Min.:
> Select the measuring functions successively with
.
Mean●:
1. Repeatedly press
until Mean● is shown in the display.
2. Activate multi-point mean calculation with
.
- Mean● flashes.
3. Record the reading for the calculation with
.
4. Repeat step 2 as required.
- The number of recorded readings is shown in the topmost line
in the display.
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5. Calculate the multi-point mean with
.
- The calculated mean is displayed and can be stored or printed
out.
> Reactivate the mean calculation with .
> Cancel the process with
.
6.3. Perform measurement procedures
Special measurement procedures are saved in the instrument that
support you when performing special measuring tasks.
6.3.1. Pretest/main test, high pressure at water pipes
Pretest and main test at gas pipes in acc. with
DVGW-TRGI 2008 worksheet G 600
The pretest (using air) is used for the load test (stability test) of
newly laid gas pipes. The test is performed at the pipe without gas
meter and fittings. The pipe is pressurized with 1 bar and the
pressure may not drop within 10 minutes. The measurement is
performed using a high-pressure probe (25 bar).
The main test (using air or inert gas, e.g. CO2 or N2) is used for the
leak test (acceptance inspection) of newly laid or restructured
pipes. The test is performed at the pipe, including the fittings,
without gas installations and corresponding control and safety
equipment. The line must be pressurized with 110 mbar which must
remain constant for 10 minutes for this test.
High pressure at water pipes
The high pressure measurement at water pipes is performed in
accordance with the same measurement procedure as a pretest at
gas pipes. Use the Pretest measurement procedure for this.
Connecting the instrument
> Connect the instrument as suits the measurement task
(pretest/high pressure or main test), see Connection variations,
page 24.
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Configure measurement procedure
1. Use
or in main menu to select Measure and confirm
selection with
.
2. Select Pretest or Maintest with
or and confirm
selection with .
If you wish to use the preset values for the stabilization
time and measurement period, continue directly to the
begin of the measurement procedure as follows:
> Select Finish with
or and confirm with
.
3. Select Stabtime with or and confirm with .
4. Set the stabilization time with or and confirm with
.
5. Select Meastime with
or and confirm with .
6. Set Meastime with or and confirm with .
7. Confirm Finish message with
.
Begin measurement procedure
1. Open the stop valve of the pressure test set, pressurize the
system using the compressor (pretest/high pressure) or the
balloon pump (main test) and close the stop valve again.
2. Begin measurement procedure with
.
- The stabilization phase ends. Following this, the measuring
phase begins automatically.
The stabilization phase can be ended early:
> Press
.
- The measuring phase starts automatically.
- After the measuring phase ends the difference value is shown.
> Press
to save the measurement result.
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6 Using the product
31
6.3.2. Leak rate/usability after pressure drop
Leak rate measurement in acc. with DVGW-TRGI 2008
worksheet G 624.
The measurement of leaks is used for the serviceability test of an
existing gas pipe system. The pipe must be cleared of gas before
the test.
Low-pressure pipes in operation are differentiated according to the
degree of usability as follows:
1 Unlimited usability exists if the gas leakage rate is lower than 1
litre per hour at operating pressure.
2 Diminished usability exists if the gas leakage rate is between 1
and 5 litres per hour at operating pressure.
3 No usability exists if the gas leakage rate is higher than 5 litres
per hour at operating pressure.
According to the degree of usability, the following measures must
be carried out:
1 If there is unlimited usability, the pipes can still be used.
2 If there is diminished usability, the pipes must be sealed or
replaced. The tightness must be restored within 4 weeks of
determining the diminished usability.
3 If there is no usability, the pipes must be immediately put out of
operation. The specifications for newly routed pipes are valid for
repaired pipeline parts and their recommissioning.
Connecting the instrument
> Connect the instrument, see Connection variations, page 24.
Configure measurement procedure
1. Use
or in main menu to select Measure and confirm
selection with .
2. Select LeakRate with
or and confirm selection with
.
3. Set the gas type with
or and confirm with .
4. Set the reference pressure with or and confirm with
.
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6 Using the product
32
5. Set the absolute pressure with or and confirm with
.
If you wish to use the preset values for the pipe volume,
continue directly to the begin of the measurement
procedure as follows:
> Confirm preset value with
.
Three circular diameters (in mm) and three pipe lengths (in m) can
be entered, from which three partial volumes can be calculated.
The performance volume is calculated by adding the three partial
volumes together.
6. Use
or to select Circle 1.
7. Confirm the selection with .
8. Set value using or . Hold the key down to go
forward/back quickly.
9. Confirm the selection with
.
10. To set other values (Length 1 for first partial volume, Circle 2
und Length 2 for second partial volume, Circle 3 and Length
3 for third partial volume), perform steps 7. to 9. accordingly.
11. Confirm Finish message with
.
12. Confirm set pipe volume with
.
Begin measurement procedure
1. Pressurize the measuring instrument.
2. Begin measurement procedure with
.
- The stabilization phase ends. Following this, the measuring
phase begins automatically.
The stabilization phase can be ended early:
> Press
.
- The measuring phase starts automatically.
- After the measuring phase ends the difference value and the
leak rate are shown.
> Press
to save the measurement result.
Page 33
7 Maintaining the product
33
7 Maintaining the product
Changing the 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 in
< 10 min.
1. Open the battery compartment on the rear of the instrument.
2. Remove the empty monobloc/rechargeable battery.
3. Insert new empty monobloc/rechargeable battery.
> Observe the polarity!
4. Close the battery compartment.
Charging rechargeable battery
Incorrect charging of batteries!
Danger of explosions.
Only start the charging process if a rechargeable
battery is in the instrument and the battery type is set to
RechBatt.
1. Check if a rechargeable battery is in the instrument.
2. Check if the battery type is set to RechBatt.
3. Connect the connector of the mains unit to the 12 V DC socket
of the instrument.
4. Connect the mains plug to the mains socket.
- A message box is displayed asking whether the rechargeable
battery should be charged.
5. Select Yes with
and confirm with .
The charging process begins automatically.
flashes during the
charging process and the current battery voltage is displayed.
Cleaning the instrument
> If the housing of the instrument is dirty, clean it with a damp
cloth.
Do not use any aggressive cleaning agents or solvents! Weak
household cleaning agents and soap suds may be used.
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8 Tips and assistance
34
8 Tips and assistance
8.1. Questions and answers
Question Possible causes/solution
Instrument switches
off after printing.
Battery voltage too low.
> Replace battery.
Display cannot be
zeroed.
There is a differential pressure outside of
the range permissible for zeroing.
> Reduce the differential pressure to a
permissible value.
Saved settings and
measurement
values are no longer
present in the
instrument.
A factory reset was performed or the
instrument was de-energized for a long
period.
> No remedy possible! Regularly save
the readings (PC software, printout).
8.2. Accessories and spare parts
Description Article no.
testo 316-1 gas leak detector 0632 0316
Differential pressure probe, 100 Pa 0638 1347
Differential pressure probe, 10 hPa 0638 1447
Differential pressure probe, 100 hPa 0638 1547
Differential pressure probe, 1000 hPa 0638 1647
Differential pressure probe, 2000 hPa 0638 1747
Absolute pressure probe, 2000 hPa 0638 1847
Relative pressure probe, 10 bar 0638 1741
Relative pressure probe, 30 bar 0638 1841
Relative pressure probe, 40 bar 0638 1941
Relative pressure probe, 100 bar 0638 2041
Relative pressure probe, 400 bar 0638 2141
Pipe wrap probe TC type K 0600 4593
Immersion/penetration probe type K 0604 0493
Temperature/air probe NTC 0610 9714
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8 Tips and assistance
35
Description Article no.
Temperature surface probe TC type K, can be
attached to 0430 0143 and 0430 0145
0604 0194
Line plug-in head probe for probe 0604 0194,
length 1.5 m
0430 0143
Line plug-in head probe for probe 0604 0194,
length 5 m
0430 0145
Hose set for testo 312-4 0554 3172
Pressure connection hose set, coiled 0554 0441
Pressure set for gas pressure measurement on
heating units
0554 0449
LW6 connection hose 0554 3158
Balloon pump with bleed screw 0554 3173
Single pipe counter cap, connects test set to
pipe
0554 3156
Dual valve connector for the connection of two or
more pipes
0554 3161
Single valve stop for blocking off the pipe 0554 3162
Conical test stop 1/2" 0554 3151
Conical test stop 3/4" 0554 3155
High-pressure stage stop 3/8" and 3/4" 0554 3163
High-pressure stage stop 1/2" and 1" 0554 3164
IR protocol printer 0554 0547
Spare thermal paper (6 rolls) 0554 0568
Connection line for high-pressure probes
0638 1741, 0638 1841, 0638 1941, 0638 2041,
0638 2141
0409 0202
Adapter for pressure probes 0699 3127
High-pressure probe to 25 bar 0638 1743
Leak detection spray to detect leaks in gas pipes 0554 3166
Table mains unit with international connection 0554 1143
Test pump for setting the test pressure 0554 3157
9 volt rechargeable battery for testo 312-4 0515 0025
Battery charger for 9 V rech. battery, for external
charging of rech. battery
0554 0025
Page 36
8 Tips and assistance
36
Description Article no.
TopSafe for testo 312-4 0516 0446
Magnetic holder for TopSafe 0554 0225
Easyheat PC software 0554 3332
RS232 cable, connecting measuring instrument
to PC
0409 0178
System case 0516 3121
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0970 3126 en 06 V01.05
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