TESTO 316-2-EX User manual

testo 316-2-EX gas leak detector
0560 3164
Instruction manual

Contents
Contents
1About this document ...........................................................................3
2Safety and disposal..............................................................................3
2.1 Security..................................................................................................3
2.2 Disposal .................................................................................................4
3Product-specific information...............................................................4
4Intended use.........................................................................................5
5Product description .............................................................................6
5.1 Instrument overview...............................................................................6
6First steps.............................................................................................6
6.1 Getting to know the product ...................................................................6
6.1.1 Switching the instrument on and off .......................................................6
6.2 Establishing a Bluetooth®connection.....................................................8
6.2.1 Establishing a Bluetooth®connection to the testo Smart App ................8
7Using the product.................................................................................8
7.1 Controls..................................................................................................8
7.1.1 Implementing settings ..........................................................................11
7.2 Carrying out a function test ..................................................................13
7.3 Carrying out gas detection ...................................................................13
7.4 Carrying out refrigerant detection.........................................................16
8Maintaining the product.....................................................................18
8.1 Charging the rechargeable battery.......................................................18
8.2 Cleaning the instrument .......................................................................18
8.3 Cleaning the sensor .............................................................................19
9Technical data for testo 316-2-EX.....................................................20
10 Tips and assistance...........................................................................21
10.1 Questions and answers........................................................................21
10.2 Error codes...........................................................................................21
10.2.1 Hard Reset...........................................................................................21
10.3 Accessories and spare parts................................................................21
11 Support ...............................................................................................22

1 About this document
3
1 About this document
The instruction manual is an integral part of the instrument.
Please keep this documentation available for future reference.
Always use the complete original instruction manual.
Please read this instruction manual through carefully and familiarize yourself
with the product before putting it to use.
Hand this instruction manual on to any subsequent users of the product.
Pay particular attention to the safety instructions and warning advice in order
to prevent injury and damage to the product.
2 Safety and disposal
2.1 Security
General safety instructions
Only operate the product properly, for its intended purpose, and within the
parameters specified in the technical data.
Do not apply any force.
Do not operate the instrument if there are signs of damage on the housing,
mains unit or connected cables.
Dangers may also arise from objects to be measured or the measuring
environment. Always comply with the locally valid safety regulations when
carrying out measurements.
Do not store the product together with solvents.
Do not use any desiccants.
Only perform maintenance and repair work on this instrument that is
described in this documentation. Follow the prescribed steps exactly when
doing the work.
Use only original spare parts from Testo.
Only use the original mains unit from Testo.
Batteries
Improper use of batteries may cause the batteries to be destroyed, or lead to
injury due to current surges, fire or escaping chemicals.
Do not expose the batteries to heavy impacts, water, fire or temperatures in
excess of 60 °C.
In the event of contact with battery acid: rinse affected areas thoroughly with
water, and if necessary consult a doctor.

3Product-specific information
4
Only charge the battery using the original Testo mains unit supplied.
Immediately stop the charging process if this is not completed in the given
time.
Warnings
Always pay attention to any information denoted by the following warnings.
Implement the precautionary measures specified!
DANGER
Risk of death!
WARNING
Indicates possible serious injury.
CAUTION
Indicates possible minor injury.
CAUTION
Indicates possible damage to equipment.
2.2 Disposal
Dispose of faulty rechargeable batteries and spent batteries in accordance
with the valid legal specifications.
At the end of its useful life, deliver the product to the separate collection
point for electric and electronic devices (observe local regulations) or return
the product to Testo for disposal.
WEEE Reg. No. DE 75334352
3 Product-specific information
Do not carry out measurements on live components.
Do not operate the instrument in environments above 80 %RH (condensing).
Observe the permissible storage and transport temperatures and the
permissible operating temperature (e.g. protect the measuring instrument
from direct sunlight)!
Always carry out a function test before searching for gas leaks.
If the instrument is misused or subjected to force, all warranty claims will be
voided!

4 Intended use
5
Do not allow the sensor to come into contact with moisture or acids, as it will
react cross-sensitively.
4 Intended use
The testo 316-2-EX is a gas leak detector for the short-term detection of leaks in
gas and refrigerant systems in potentially explosive atmospheres of the class
ATEX II 2 G Ex ib IIC T1G according to Directive 2014/34/EU (ATEX).
The following substances can be detected:
Methane CH4
Propane C3H8
Butane C4H10
Hydrogen H2
Refrigerants (R1234yf, R134A, R404A, R407C, R410A, R1234ze, R290,
R417A, R513A, R32, R449A, R22)
The instrument is not suitable for precise measurement of the gas
concentration.
ATTENTION
Explosive limits of flammable substances
A flammable substance in the air has a lower explosive limit (LEL) and
an upper explosive limit (UEL).
The air/gas mixture is flammable anywhere between these two limits,
potentially leading to an explosion (critical range).
Below the LEL, the mixture is too lean for an explosion, and above the
UEL it is too rich (non-critical range).
The explosive limits depend on the substance:
-Methane CH4: LEL 4.4 vol.% / UEL 16.5 vol.%
-Propane C3H8: LEL 1.7 vol.% / UEL 10.9 vol.%
-Butane C4H10: LEL 1.4 vol.% / UEL 9.4 vol.%
-Hydrogen H2: LEL 4.0 vol.% / UEL 77.0 vol.%
-Refrigerant: There are flammable and non-flammable refrigerants.
R290, for example, is chemically identical to propane and therefore
equally flammable.
ATTENTION
Restrictions on the field of use
-Do not use the instrument as a monitoring instrument for personal
safety! The instrument is not protective equipment!
-Do not use the instrument as a gas analyzer! The sensor detects
almost all combustible gases alike.

5Product description
6
5 Product description
5.1 Instrument overview
1
Sensor head with gas sensor
2
Sensor LED
3
Flexible sensor tube
4
Display
5
Control keys
6
Charging socket for rechargeable
battery
6 First steps
6.1 Getting to know the product
6.1.1 Switching the instrument on and off
Switching on
Only switch on the instrument in fresh air, since automatic zeroing is carried out
when the instrument is switched on. The ambient temperature and ambient
humidity during zeroing should correspond to the ambient conditions at the
measuring location. If necessary, zero again manually at the measuring location
(switch off and on again).
If the unit is not used for a prolonged period of time, the sensor will
become contaminated. Particularly if the instrument has not been in
operation for a prolonged period of time (> 2 weeks), it should be left
switched on for a while before being used. The longer it has not been in
operation, the longer this additional warming-up phase should be.

6 First steps
7
Please note that the instrument switches itself off by default after 10
min of inactivity.
1
Press and hold down (1 sec) the On/Off key.
Warm-up phase (HEAT)

The instrument starts up. With regular use, the warm-up period takes
approx. 20 sec and is symbolized by the text "HEAT" and a
countdown.
As long as the sensor LED is flashing orange, the instrument is not
ready for use.

Following the warm-up period, the measurement view is displayed.
Self-cleaning (CLN)

If the sensor is dirty, the warm-up phase is followed by the sensor
cleaning phase. This usually happens when the instrument has not
been used for several days. The self-cleaning is symbolized by the text
"CLN" and a countdown.
Switching off
CAUTION
Caution! Risk of burns due to hot sensor head after prolonged
operation.
-Before touching the sensor head or packing the instrument: switch
instrument off and let the sensor head cool down.
1
Press and hold down (1 sec) the On/Off key.

The instrument is switched off.
Auto OFF
After 10 minutes of inactivity (no user input, no gas concentration above the
warning threshold), the instrument switches itself off. The switch-off is signalled
beforehand by an alarm sound, red flashing of the sensor LED and a 10 sec
countdown.
You can prevent the instrument from switching off by pressing any key within 10
seconds.
Enabling/disabling the Auto-OFF function:
1
Press the Sound and UNIT keys simultaneously for 1 sec.

Enabling/disabling is confirmed by "AOFF ON" or "AOFF OFF".

7Using the product
8
6.2 Establishing a Bluetooth®connection
The instrument can be connected to the testo Smart App via
Bluetooth®connection.

The gas leak detector is switched on.
6.2.1 Establishing a Bluetooth®connection to the
testo Smart App
To establish a connection via Bluetooth®, you need a
tablet or smartphone with the Testo Smart App already
installed on it.
You can get the App for iOS instruments in the App Store
or for Android instruments in the Play Store.
Compatibility:
Requires iOS 12.0 or later/Android 6.0 or later,
requires Bluetooth®4.2.
1
Open the testo Smart App.

The app automatically searches for Bluetooth®devices in the vicinity.
2
In the Bluetooth menu, check whether the required instrument is
connected.

If necessary, switch the instrument to be connected off and on again
to restart the connection mode.
7 Using the product
The gas leak detector can be used in conjunction with the testo Smart App.
7.1 Controls

The instrument is switched on.

The app is installed on the smartphone and connected to the
instrument via Bluetooth®.

Settings and controls are primarily carried out on the instrument and
are transferred to the app. To a lesser extent, control via app is also
possible (selection of gas type).

7 Using the product
9
1
Sound / Illumination key
2
On/Off / GAS key
3
Bar display
4
Mode
5
Measurement parameter
6
Display for alarm signal, Bluetooth®, charge level
7
Maximum measured value
8
Current measured value
9
Unit of value
10
->0<- / max ->0<- key
11
MODE / unit key

7Using the product
10
Additional symbols on the user interface of the app (not numbered)
One level back
Exit view
Share measurement data/report
Searching
Favourite
Deleting
Further information
Display report
Multiple selection
The Main menu can be accessed via the icon at top left. To exit the main
menu, select a menu or right-click on the guided menus. The last screen
displayed is shown.
Measure
Customer
Memory
Sensors
Settings
Help and Information
Other applications

7 Using the product
11
7.1.1 Implementing settings
Selecting, opening and setting functions
1
Press the relevant key to select the functions.
Secondary assignment (long press)
All keys with a white corner have a secondary assignment, which can be
selected by pressing and holding the key (1 sec).
Adjustable functions
Ensure correct settings: all settings are transferred immediately. There
is no Cancel function.
Function
Setting options/comments
On/Off (long press)
Switches the instrument on or off
Measurement parameter
Cycle through CH4(methane), C3H8
(propane), C4H10 (butane), H2
(hydrogen) or refrigerant
Display illumination / sensor LED
(long press)
OFF (display illumination and sensor
LED not active) or ON (display
illumination and sensor LED active)

7Using the product
12
Function
Setting options/comments
Alarm sound
ON (acoustic alarm on) or OFF
(acoustic alarm off).
The frequency of the alarm sound
increases as the concentration
increases.
Unit (long press)
Switch between g/a (refrigerant only),
PPM and %LEL
Measuring mode
MODE 1 for gas detection
MODE 2 for locating leaks
Max. zeroing (long press)
Zero maximum reading
Zeroing
Zero current reading, up to 250 ppm
can be suppressed. Symbolized by an
arrow pointing downwards on the
display.

7 Using the product
13
7.2 Carrying out a function test
1
Apply low-concentration gas to the sensor (max. 10 sec).

If the sensor does not respond (no alarm), the instrument is defective
and must no longer be used. The instrument must be taken to the
service centre for repair.
Due to the selectivity of the sensor, gas equivalents are not suitable for
checking the function and especially not for calibrating the sensor.
7.3 Carrying out gas detection
This section deals with the detection of fuel gases. For the detection of
refrigerants, please see the following section.
ATTENTION
Destruction of the sensor due to external influences!
-Do not expose the sensor to high concentrations of
H2S (hydrogen sulphide), SOx(sulphur dioxides), Cl2
(chlorine), or HCl (hydrogen chloride).
-> Prevent alkaline materials or water from coming into
contact with the sensor.
-> Do not expose the sensor to moisture or frost.
Have the instrument serviced annually by the manufacturer.
Testing natural gas lines or hydrogen lines:
Methane (main component of natural gas) or hydrogen are lighter than
air, detection should be carried out above the pipe / suspected leak.
Testing propane and butane gas lines: Propane and butane are heavier
than air, detection should be carried out below the pipe / suspected
leak, starting from the bottom and working upwards.
Selecting the gas to be detected
1
Select the gas types via the GAS key or the testo Smart App using the
3-point menu in the top right corner of the output field

After switching on the instrument, the process of cycling through starts
with methane (CH4).
Automatic identification of common gas types
The gas is automatically detected and indicated by a flashing gas icon on the
display if a gas concentration currently applied to the sensor has characteristics
of a different gas type than is currently selected.

7Using the product
14
For technical reasons, this is subject to uncertainty and is intended as a support
for users, and must therefore always be checked by the user.
Forming gas
When pressure testing with forming gas (95% N2, 5% H2), the instrument can
detect leaks based on the hydrogen content.
1
Use the GAS key to set the instrument to H2.
Selecting the mode
1
Press the MODE key to switch between modes.
MODE 1 is suitable for measuring the general gas concentration in indoor areas.

The gas concentration is indicated by
the increasing bar display.
MODE 2 is suitable for locating a leak. In this mode, rising or falling
concentration values are output.

At the beginning, two bar segments
are displayed in the middle.
At the same time, the sensor LED
flashes in a colour corresponding to
the concentration value and an audio
signal is emitted at the same
frequency.

7 Using the product
15

As the concentration increases, a
deflection to the right is displayed.
The frequency of the flashing/audio
signal increases.
As the concentration decreases, a
deflection to the left is displayed. The
frequency of the flashing/audio signal
decreases.

If the concentration remains unchanged, the deflection moves back to
the centre. The deflection is reset manually using the [--> 0 <--]key
Carrying out the measurement
1
Move the sensor head as close as possible and at low speed (approx.
< 2 cm per second) over the components that are to be checked for
leaks.
The surface of the sensor must not be covered.

Concentration < 100 ppm: The sensor LED and the display
illumination light up green. In addition, the bar display increases.
Concentration > 100 and < 999 ppm: The sensor LED and the
display illumination light up yellow. In addition, the bar display
increases.
Concentration > 999 ppm: The unit changes to VOL% and the bar
display increases.
Concentration > 9999 ppm / > 0.99 VOL%: The sensor LED and the
display light up red (alarm threshold).

When the lower explosive limit is reached, ">LEL" is displayed. Higher
values are not displayed.
To locate the leak, it is advisable, in the case of these larger leaks, to
switch to MODE 2 in order to receive feedback via audio and flashing
signals.

If the warning threshold (100 ppm) is exceeded, the sensor LED and
display illumination light up yellow. If the acoustic alarm is enabled, an
additional warning sound is emitted when the warning threshold is
exceeded, the frequency of which increases as the concentration
increases, and changes to a continuous tone when the second alarm
threshold (10,000 ppm) is exceeded.

7Using the product
16
Changing units
By default, the display shows ppm (concentration in parts per million). From a
concentration of >999 ppm, the display changes to vol% (1000 ppm=0.1 vol%).
Higher concentrations in ppm are also displayed in the app.
In addition, %LEL (the percentage of the lower explosive limit that has been
reached) can be selected (not for refrigerants due to the smaller measuring
range).
1
Press the unit key to change the unit.
Carrying out manual zeroing
The zero point can only be set manually if the currently detected gas
concentration is below the max. 250 ppm (max. 250 ppm can be suppressed).
For example:
150 ppm (≤ 250 ppm): are completely suppressed (display: 0 ppm)
1000 ppm (> 250 ppm): 250 ppm are suppressed (display: 750 ppm)
Gas concentrations present at the time of zeroing are suppressed by
zeroing. As a result, the displayed reading no longer corresponds to the
real gas concentration.

The instrument is in measurement view.
1
Briefly press [--> 0 <--].

The zero point for the current reading is reset or the current
suppression is cancelled.

On instruments with a display, the suppression of the reading is
symbolized by an arrow pointing downwards on the display.
The maximum reading can be zeroed using [max --> 0 <--].
After the measurement
1
Ventilate the sensor thoroughly after each use. To do this, place the
instrument in fresh air for approx. 2 minutes before using it again.
7.4 Carrying out refrigerant detection
The refrigerant loss can be output in grams/year (g/a), but the instrument only
measures the concentration as an input quantity. A conversion is carried out in
the instrument. For this, the leak must be scanned at a defined speed of 2
cm/sec at a distance of 1 cm.

7 Using the product
17
Selecting the refrigerant to be detected
1
Select the refrigerant via the GAS key or the testo Smart App using
the 3-point menu in the top right corner of the output field.

After switching on the instrument, the process of cycling through starts
with methane (CH4).
It is advisable, especially with refrigerants, to select the refrigerant via
the app, as otherwise you may have to press the GAS key very
frequently to cycle through.
Carrying out the measurement
1
Move the sensor head as close as possible and at low speed (2 cm
per second) over the components that are to be checked for leaks.

Concentration < 20 ppm: The sensor LED and the display
illumination light up green
Concentration > 20 and < 35 ppm: The sensor LED and the display
illumination light up yellow
Concentration > 35 ppm: The sensor LED and the display
illumination light up red.

For the output in %LEL, you can switch to the corresponding
chemically identical gas type as the measured value for the following
refrigerants:
R290 - Propane
R50 - Methane
R702 - Hydrogen
R600a - Butane

When the upper display range is reached, ">-" is displayed. Higher
values are not displayed.
To locate the leak, it is advisable, in the case of these larger leaks, to
switch to MODE 2 in order to receive feedback via audio and flashing
signals.

If the warning threshold (20 ppm) is exceeded, the sensor LED and
display illumination light up yellow. If the acoustic alarm is enabled, an
additional warning sound is emitted when the warning threshold is
exceeded, the frequency of which increases as the concentration
increases, and changes to a continuous tone when the second alarm
threshold (35 ppm) is exceeded.

8Maintaining the product
18
Changing units
By default, the display shows ppm (concentration in parts per million). From a
concentration of >999 ppm, the display changes to vol% (1000 ppm=0.1 vol%).
Higher concentrations in ppm are also displayed in the app.
In addition, %LEL (the percentage of the lower explosive limit that has been
reached) can be selected (not for refrigerants due to the smaller measuring
range). For refrigerants, g/a can be selected in addition to ppm.
1
Press the unit key to change the unit.
After the measurement
1
Ventilate the sensor thoroughly after each use. To do this, place the
instrument in fresh air for approx. 2 minutes before using it again.
8 Maintaining the product
8.1 Charging the rechargeable battery
DANGER
-Do not charge the rechargeable battery in potentially explosive
atmospheres!
Only charge the battery using the original Testo mains unit supplied.
The instrument indicates that the battery needs to be charged via a flashing
battery symbol.
1
Connect the instrument to the mains via the mains unit. To do this,
insert the plug of the mains unit into the charging socket on the
underside of the instrument.
When the mains unit is plugged in during operation, the instrument
switches off due to ATEX regulations.
The instrument can become very warm during charging and should not
be held in your hand.
8.2 Cleaning the instrument
1
If the housing of the instrument is dirty, clean it with a damp cloth.
Do not use any aggressive cleaning agents or solvents! Mild household
cleaning agents and soap suds may be used.