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Operating Instructions
flowtherm NT
Software status from 2.01
Multifunctional handheld unit with data logger for measuring flow rate,
flow velocity, temperature, pressure and other variables
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Thermal sensors TA, TADi
Always connect just one sensor at a time!
Vane wheel sensors FA(R), FT,
FA(R)Di or vortex sensors VA, VAT, VADi
or temperature sensors Pt100
2 analog outputs 0-10 V
analog input 4-20 mA
analog input 0-10 V
Connector socket cap
Close any connections not in use!
Measured value display
Input channel 1: name/unit
value
Input channel 2: name/unit
value
Input channel 3: name/unit
value
Function keys Designation
Function keys
, , with variable
functions depending on
operation menu
USB connection type 'B'
for connecting to PC or
adapter plug
Switch off
and reset
Switch on
Input channel
and status info
Battery compartment
for 4 batteries / rechargeable batteries Mignon (AA)
Arrow keys (measured value display)
, : shift between
1, 2 and 3 values
, : scroll the 3 values
with display of 1 and 2
values
ok key (measured value display)
: switching the display light on
or off
Holding magnet
for fixing the unit to
metal surfaces
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Overview and brief introduction of controls and connections
For settings and other
functions see Section 5
Please ensure that the correct sensor (FA, VA or TA) is selected (see under 5.3.20.1)!
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Contents
1 Safety Instructions ..................................................................................................................... 4
1.1 Specific information ........................................................................................................... 4
1.2 Handling batteries and accumulators ................................................................................... 5
1.3 Precautions for hazardous areas .......................................................................................... 5
2 Scope of Delivery ....................................................................................................................... 6
2.1 Description, type plate ....................................................................................................... 6
3 Technical Specifications .............................................................................................................. 8
3.1 Operating conditions .......................................................................................................... 8
3.2 Housing and connection ..................................................................................................... 8
3.3 Electrical data ................................................................................................................... 8
3.4 Measurement uncertainty ................................................................................................... 9
4 Initial Operation / Startup ........................................................................................................... 9
4.1 Connector sockets ............................................................................................................. 9
4.2 Wiring diagram for the 8-pin connector plug ....................................................................... 10
4.3 Wiring diagrams for the 12-pin connector plug .................................................................... 11
5 Operation ............................................................................................................................... 12
5.1 Key functions .................................................................................................................. 12
5.2 Setup menu after switch on: ............................................................................................ 14
5.3 Parameter settings .......................................................................................................... 16
5.3.1 FA - Basic settings ............................................................................................. 16
5.3.2 FA - Measurement settings .................................................................................. 17
5.3.3 FA - Density correction ....................................................................................... 18
5.3.4 FA – Operating conditions ................................................................................... 19
5.3.5 FA – Standard conditions .................................................................................... 19
5.3.6 FA - Pairs of values ............................................................................................ 19
5.3.7 VA - Basic settings ............................................................................................. 20
5.3.8 VA - Measurement settings ................................................................................. 20
5.3.9 VA – Operating conditions ................................................................................... 21
5.3.10 VA – Standard conditions .................................................................................... 21
5.3.11 VA - Pairs of values ............................................................................................ 22
5.3.12 TA - Basic settings ............................................................................................. 22
5.3.13 TA - Measurement settings .................................................................................. 22
5.3.14 TA – Standard conditions .................................................................................... 23
5.3.15 TA - Pairs of values ............................................................................................ 24
5.3.16 Pt100 - Unit ...................................................................................................... 24
5.3.17 Analog input ...................................................................................................... 24
5.3.18 Output .............................................................................................................. 25
5.3.19 Counter ............................................................................................................ 25
5.3.20 Display ............................................................................................................. 25
5.3.21 Long-term measurement .................................................................................... 27
5.3.22 Device .............................................................................................................. 29
5.3.23 Factory settings ................................................................................................. 29
5.3.24 Data logger ....................................................................................................... 29
5.3.25 Device status ..................................................................................................... 30
5.3.26 Device profiles ................................................................................................... 31
5.3.27 Key F3 - LM-Start .............................................................................................. 31
5.3.28 Key 4 Switch off / OFF (reset) ............................................................................. 31
6 Troubleshooting ....................................................................................................................... 32
7 Replacement Parts ................................................................................................................... 33
8 Instruction Manual Category 3G flowtherm NT ............................................................................. 33
8.1 Equipment ..................................................................................................................... 33
8.2 Safety Instructions .......................................................................................................... 33
8.3 Technical Data ................................................................................................................ 34
8.4 Installation ..................................................................................................................... 34
8.5 Maintenance ................................................................................................................... 34
9 Declaration of conformity .......................................................................................................... 35
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1 Safety Instructions
Danger to life, risk of injury and damage to material or property.
Read the Operating Instructions carefully before initial operation.
Observe general safety precautions as well as those included in various sections of these Operating
Instructions.
Hazard risks:
- non-observance of the Operating and Safety Instructions
- modifications to the device by the customer
- handling the device outside the specified operating conditions
- handling the sensors outside the specified operating conditions
- use of unsuitable power supplies and peripheral devices
- improper use of the device
Prevention of voltage hazards:
- use only the dedicated adapter plug for the mains supply
- make sure that the PC is correctly connected to the mains (earthed safety socket, earthing) when
using a USB connection
- when connecting analog outputs or inputs to peripheral devices make sure that these are correctly
connected to the mains (earthed safety socket, earthing)
Danger when installing the sensors in pressurized pipelines:
- sensors for use in pressurized pipelines are to be inserted or retracted only in depressurized con-
ditions; non-observance may result in serious injuries to personnel
- when installing or removing under pressure, the appropriate protective equipment must be used, e.g.
ball valve and probe guide pieces with chain guard or spindle probe guide pieces
Danger when using in explosive atmospheres:
- the unit and its sensors may be used in areas specified for category 3G (zone 2 gas) equipment only
- if sensors with category 1/2 G, 1/2 D or 2 G, 2 D or 3 D markings are connected to the device they
may be used in category 3G areas only! (See also Instruction Manual Category 3G and
Declaration of Conformity in Sections 8 and 9)
1.1 Specific information
- pay special attention to the mains voltage when using voltage converters
- observe the maximum power rating when connecting sensors powered by more than 12 V
- when operating out of doors make sure that the battery compartment cover and sensor plug are
screwed on tightly, the connector sockets not in use are firmly capped, and the USB connection cover
is tightly sealed, otherwise the IP65 protection cannot be guaranteed
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1.2 Handling batteries and accumulators
- All batteries/accumulators must be replaced at the same time. Do not replace single cells! All replace-
ments must be identical (cell type / nominal capacity / make) and fitted the right way round. Possible
reverse polarity of single cells is to be avoided (electrolyte formation)
- Recharge batteries with a suitable charger away from the unit
- Remove batteries when they are dead or if the device is not being used for any length of time to avoid
leakage
- Batteries contain hazardous substances and must never be disposed of in household waste
- Never recharge normal batteries
1.3 Precautions for hazardous areas
- It is prohibited to use rechargeable batteries in hazardous areas
- Do not connect or disconnect plugs in hazardous atmospheres. This also applies to connected sensors
which must be mechanically screwed in place
- Use of the USB port in hazardous areas is not allowed without the protective USB cover
- Use of the USB port as a power supply is prohibited
- It is forbidden to change batteries in the hazardous environment
- Prior to measuring always check that the battery compartment is closed correctly to ensure that the
batteries are securely fixed. The compartment cover must be screwed on tightly before use
- If severe fluctuations in temperature are to be expected, the device should be left to adapt
to the ambient temperature for at least one hour before use to avoid problems with condensation.
In particular, the battery contacts should be checked for condensate or corrosion as well as leakage
- Devices in which the batteries have leaked must on no account be used in hazardous atmospheres, but
must be returned to the manufacturer for repair
- Mechanical shocks are to be avoided
- Damaged instruments should be checked before use. If in doubt, return to the manufacturer for inspec tion
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2 Scope of Delivery
- handheld flowtherm NT
- Operating Instructions and Data Sheet flowtherm NT
- FA, VA or TA sensor(s) as ordered
- relevant Data Sheet for above
- other sensors such as Pt100, if ordered
- accessories for sensors, e.g. extension rod for FA sensor, if ordered - CD-ROM with PC software HLOG
II and USB cable (optional)
- adapter plug and USB cable (optional)
- various connection and extension cables, connectors (optional)
- carrying case (optional)
Please check that everything listed in the Delivery Note / Technical Data Sheet is included in the delivery.
2.1 Description, type plate
The flowtherm NT is a multifunctional handheld unit with data logger for measuring flow velocity, volume
flow/flow rate, standard flow rate, mass flow rate, temperature, pressure and other variables, insofar as
they are measurable / deducible with connectable sensors:
- vane wheel FA, FAR, FT, FADi, FARDi
- vortex VA, VAT, VADi
- thermal TA10, TADi
- temperature Pt100
- 2-wire 4-20 mA 12 V supply
- 3- or 4-wire 4-20 mA output and 12 V supply
- 3- or 4-wire 0-10 V output and 12 V supply
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1
2
3
4
5
6
7
8
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The following type plate is found on the back of the unit:
Description of type plate specifications:
1: Description
see Section 2.1
2: Unit and serial no.
3: Marking for Ex-application category 3G
see Safety Instructions Section 1
see Instruction Manual Category 3G Section 8
see Declaration of Conformity Section 9
4: Inputs
see Description Section 2.1
see Connector sockets Section 4.1
see Wiring diagrams Section 4.2 and 4.3
5: Outputs
see Electrical data Section 3.3
see Connector sockets Section 4.1
see Wiring diagrams Section 4.3
6: USB connection
see Electrical data Section 3.3
see Connector sockets Section 4.1
7: Power supply
see Safety Instructions Section 1
see Electrical data Section 3.3
8: Operating conditions
see Safety Instructions Section 1
see Operating conditions Section 3.1
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3 Technical Specifications
3.1 Operating conditions
Ambient temperature
of connection housing in service : -20 ... +50 °C
Type of protection : IP65
3.2 Housing and connection
Type of protection : IP65 with battery compartment cover and sensor plug screwed on
tightly, connector sockets not in use firmly capped, and USB connection
cover tightly sealed
Material : electrically conductive ABS plastic
External measurements, weight : W/H/L = 96/42/197 mm, approx. 520 g
Connections : 5-pin connector plug for thermal sensors
: 8-pin connector plug for vane wheel, vortex or temperature sensors
12-pin connector plug for analog outputs or inputs
USB for data logger readout, configuration and external power supply
via PC or mains adapter
3.3 Electrical data
Power supply : via 4 alkaline manganese (LR6) Mignon (AA) 1.5V batteries
(maximum permissble nominal capacity 4000 mAh per cell)
running time (Duracell Plus) approx. 24 hours
(using FA sensor without display light)
or via 4 NiMH rechargeable Mignon (AA) 1.2V batteries
running time (Ansmann Digital 2850 mAh) approx. 26 hours
(using FA sensor without display light)
Open the battery compartment with a screw driver. Always change all 4 batteries at the same time,
checking for correct polarity. Only ever recharge batteries away from the unit using a suitable charger.
Always ensure that all 4 rechargeable batteries are fully charged before inserting. To close the compartment press it firmly in the seal (in the direction of the connector sockets) and screw down tightly.
Mains supply : via USB connection with PC or adapter plug
Supply current : via USB connection not less than 300 mA
The mains supply is not electrically isolated from the outputs.
The "-" connection of the analog outputs and the earth of the USB connection have the same potential, i.e.
for EMC reasons a peripheral device should have potential-free inputs for evaluation of the analog outputs
when connecting to a PC.
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5-pin connector socket:
for thermal sensors TA10 and TADi measuring tubes
8-pin connector socket:
for vane wheel sensors FA, FAR, FT and FADi measuring tubes
for vortex sensors VA, VAT and VADi measuring tubes
for temperature sensors Pt100
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Analog outputs (2 x) : 0 ... 10 V with internal resistance of 1000 Ohm; measured, initial and
final values adjustable as appropriate
Analog input 4-20 mA : for connection of sensor in 2-wire system with 12 V;
allocation of unit, initial value and final value adjustable
Analog input 0-10 V : for connection of sensors with voltage output; input resistance 5 MOhm;
12 V power supply for sensors, max. 100 mA; allocation of unit, initial
value and final value adjustable
3.4 Measurement uncertainty
Input FA : +/- 1 Hz
Input VA : +/- 1 Hz
Input TA : +/- 1 (0.7 % of measured value + 0.02 % FS)
Temperature display : +/- 1 Kelvin
Analog input 0-10 V : +/- 1 (0.3 % of measured value + 0.02 % FS)
Analog input 4-20 mA : +/- 1 (0.3 % of measured value + 0.02 % FS)
Input Pt100 : +/- 0.2 Kelvin
Analog output 1+2, 0-10 V : +/- 1 (0.2 % of measured value + 0.02 % FS)
All values apply for a set damping rate of 30 seconds during measurement. In addition, the measurement
uncertainty of the utilised sensors must be taken into consideration.
4 Initial Operation / Startup
For installation and operation of the system, especially in category 3G, the national regulations
currently in force, the recognised standards of good practice and these Operating Instructions
apply.
4.1 Connector sockets
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2
8
6 7
4
1
5
3
12-pin connector socket:
for analog outputs 2 x 0-10 V
for analog input 4-20 mA
for analog input 0-10 V
USB connector socket type B
data logger readout, hardware configuration
for external power supply via PC or adapter plug
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Always connect just one sensor at a time!
Always make sure that the connector sockets not in use are firmly capped, the sensor plug is
screwed on tightly and the USB connection cover is tightly sealed, otherwise the IP65 protection
cannot be guaranteed
4.2 Wiring diagram for the 8-pin connector plug
Electrical connection must be carried out according to the relevant wiring diagram.
Incorrect connection can cause serious damage to the electronics.
Wiring diagram with view of solder contacts:
Pin assignment
Pin 1: v/FA+FAR signal 1 F or v/VA signal F
Pin 2: ground G
Pin 3: Pt100
Pin 4: Pt100
Pin 5: Pt100
Pin 6: Pt100
Pin 7: v/FAR signal 2 F
Pin 8: V+
Housing: shield
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4.3 Wiring diagrams for the 12-pin connector plug
Electrical connection must be carried out according to the relevant wiring diagram.
Incorrect connection can cause serious damage to the electronics.
Wiring diagrams with view of solder contacts:
4.3.1 Analog outputs 0-10 V
C = analog output port 1
D = analog output port 2
E = signal - (0 V)
plug shell = shielding
4.3.2 Analog input 4-20 mA
(2-wire system current
for 12V supply)
A = power supply + (12V)
F = power supply –
plug shell = shielding
4.3.3 Analog input 4-20 mA
(3 or 4-wire system current
for 12V supply)
A = power supply + (12V)
B = power supply – (0V)
F = signal +
H = signal - (0V)
plug shell = shielding
4.3.4 Analog input 0-10 V
(3 or 4-wire system voltage
for 12V)
A = power supply + (12V)
B = power supply – (0V)
G = signal +
H = signal – (0V)
plug shell = shielding
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5 Operation
5.1 Key functions
Switch on: with the key (also symbol)
hold down until text appears in the display.
Switch off: with the key (also symbol)
press briefly and wait until the display goes off.
Reset! Should the unit no longer react to key operation, switch off can be enforced by holding down
the off key for more than 10 seconds.
Control keys: , and are keys with variable function, identified in the bottom
row of the display depending on user level.
Arrow keys: In measured value display / view after switch on:
during measured value display the arrow keys have the following function:
and : shift the display. Definition whether the values from 1, 2 or 3
input channels are displayed simultaneously. Depending on selection, the
character size of the display value changes.
and : is the display so set that only measured values from 1 or 2
input channels are displayed simultaneously, then these keys can be used for scroll-
ing through the input channels.
In the menus and input boxes:
, , and are control keys for navigating within the various menus
and menu levels.
ok key: In the measured value display / view after switch on:
is a control key for switching the display light on or off.
In the menus and input boxes:
is a control key to select and save.
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Examples for key functions in the menus:
Menu selection list:
With up or down in the list; the selected element
is highlighted.
With a menu level higher (backwards).
With a menu level lower (forwards) = select.
With select = a menu level lower (forwards).
With return to measured value display.
With switch off.
Parameter value selection window:
With new selection element; the selected element
flashes (here "mn").
With select and save and return to selection list.
With return to measured value display without saving.
With return to selection list without saving.
With switch off.
Parameter value digit (numeric/text) setting:
With change digit; the selected and editable
digit flashes (here "1").
With 1 digit to the left or right respectively.
With select and save and return to selection list.
With return to measured value display without saving.
With return to selection list without saving.
With switch off.
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5.2 Setup menu after switch on:
Menu
Settings
Sensor
Basic settings 5.3.1
Type 5.3.1.1
Range 5.3.1.2
Material 5.3.1.3
Directional sensing 5.3.1.4
Measurement settings 5.3.2
Medium 5.3.2.1
Section 5.3.2.2
Profile factor 5.3.2.3
Damping 5.3.2.4
Density correction 5.3.3
Operating conditions 5.3.4
Service temperature 5.3.4.1
Working pressure 5.3.4.2
Standard conditions 5.3.5
Standard temperature 5.3.5.1
Standard pressure 5.3.5.2
Standard density 5.3.5.3
Pairs of values 5.3.6
VA input
Basic settings 5.3.7
Type 5.3.7.1
Measurement settings 5.3.8
Section 5.3.8.1
Profile factor 5.3.8.2
Damping 5.3.8.3
Operating conditions 5.3.9
Service temperature 5.3.9.1
Working pressure 5.3.9.2
Standard conditions 5.3.10
Standard temperature 5.3.10.1
Standard pressure 5.3.10.2
Standard density 5.3.10.3
Pairs of values 5.3.11
TA input
Basic settings 5.3.12
Type 5.3.12.1
Measurement settings 5.3.13
Section 5.3.13.1
Profile factor 5.3.13.2
Pressure 5.3.13.3
Damping 5.3.13.4
Standard conditions 5.3.14
Standard temperature 5.3.14.1
Standard pressure 5.3.14.2
Standard density 5.3.14.3
Pairs of values 5.3.15
Pt100 input
Unit 5.3.16
Analog input 5.3.17
FA input
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Menü
Settings
Output 5.3.18
Port 5.3.18.1
Source 5.3.18.2
Counter 5.3.19
Reset 5.3.19.1
Decimals 5.3.19.2
Display 5.3.20
Sensor 5.3.20.1
Rows 5.3.20.2
Row 1 5.3.20.3
Row 2 5.3.20.4
Row 3 5.3.20.5
Long-term measurement 5.3.21
Mode 5.3.21.1
Device 5.3.22
Factory settings 5.3.23
Data logger 5.3.24
Switching on / off 5.3.24.1
View 5.3.24.2
Settings 5.3.24.3
Delete 5.3.24.4
Status 5.3.25
Profiles 5.3.26
Switch off 5.3.28
LM-Start
5.3.27
Logger
Switching on / off 5.3.24.1
View 5.3.24.2
Settings 5.3.24.3
Delete 5.3.24.4
Off/ Reset
5.3.28
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5.3 Parameter settings
Settings for vane wheel sensors FA:
5.3.1 FA - Basic settings
The connected vane wheel sensor determines the parameter type, measuring range, material and directional sensing to be set.
5.3.1.1 Type
Setting the vane wheel type:
This can be determined from the serial no. on the sensor.
Selection: mc = micro - for use in for instance:
measuring tubes with ID 9.7 mm
mn = mini for use in for instance:
measuring tubes with ID 18.2 mm
md = midi for use in for instance:
pairs of values = special calibration characteristic specifically matched to the
measuring task based on up to 30 supporting points. Input or
changing the points, see under 5.3.6
Distinctive feature of sensors with vane wheel types md3 and ms (measuring tube):
These sensors are always supplied with a special calibration characteristic. Therefore, always select pairs
of values. For input or change see (5.3.6) pairs of values.
5.3.1.2 Range
Setting the vane wheel measuring range:
This can be determined from the serial no. on the sensor.
Selection: 20 = measuring range up to 20 m/s
40 = measuring range up to 40 m/s
80 = measuring range up to 80 m/s
120 = measuring range up to 120 m/s
Menu -> Settings -> Sensor -> FA input -> Basic settings
cylinder probes with OD 14, 16, 18 mm
cylinder probes with OD 25 mm
cylinder probes with OD 30 mm
Exceeding the measuring range can cause permanent damage to the vane wheel!
5.3.1.3 Material
Setting the vane wheel sensor material:
This can be determined from the serial no. on the sensor.
Selection: steel = E
aluminium = A
titanium = T
5.3.1.4 Directional sensing
Setting the directional sensing function: such sensors are identified by an "R" in the serial number.
Selection: Y = directional sensing yes, measured value display with prefix
N = directional sensing no, measured value display without prefix
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Pipe ID
in mm
PF for ZS16 (mc)
PF for ZS18 (mc)
PF for ZS25 (mn) and
ZS30 (md)
40
0.914
0.898
50
0.933
0.916
0.735
60
0.950
0.932
0.760
70
0.964
0.948
0.784
80
0.976
0.962
0.807
90
0.987
0.975
0.829
100
0.994
0.986
0.849
120
1.004
1.004
0.882
170
1.008
1.021
0.935
180
1.008
1.021
0.945
220
1.008
1.021
0.955
...
1.008
1.021
0.955
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5.3.2 FA - Measurement settings
The task to be carried out determines the parameter, medium, section and profile factor to be set.
5.3.2.1 Medium
Setting the medium:
Selecting pairs of values in the basic settings (5.3.1.1) has no impact on the measurement.
Selection: G = Gases, the characteristic for air/gases is applied
F = Liquids (Fluids), the characteristic for water/liquids is applied
Menu -> Settings -> Sensor -> FA Input -> Measurement settings
Use only "GF" sensors (see technical documents) for measuring in liquids; otherwise the sensor can
be permanently damaged!
5.3.2.2 Section
Setting the measuring section for measuring in pipelines for flow rate display:
Selection: Circular = for pipes with circular section
di/mm: enter the ID in mm
Rectangular = for pipes with rectangular section
a/mm: enter the inner surface a in mm
b/mm: enter of the inner surface b in mm
5.3.2.3 Profile factor
The profile factor PF specifies the ratio of mean flow velocity in the measuring section and the flow velocity
measured from the sensor. Requirements are: centric sensor positioning, non-rotational inlet flow and
adequately dimensioned input/output sections. (See also Documents U117 and U205)
Following profile factors are to be set for vane wheel cylinder probes (ZS..) subject to pipe diameter:
For measurements in larger free jet as well as larger ducts or measuring tubes PF = 1.000 results in the
local/punctual velocity.
With TABLE a profile factor subject to the vane wheel type (5.3.1.1) and diameter of the measuring
surface (5.3.2.2) is recommended. This value can be verified or also amended before saving. If rectangular is selected, the surface is converted to circular for the proposed value and this value is approximate.
If the sensor is a ZS18 (mc), the value must be amended according to the table above.
PF = 1.000 must always be set for FADi... measuring tubes calibrated with pairs of values!
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5.3.2.4 Damping
The damping rate set here affects the measured value display, if FA is selected as sensor in the display
settings (5.3.20.1). Damping also affects the analog output if FA is selected as the source (5.3.18).
Damping/s: enter the damping time of 01 to 99 seconds
Example 10 seconds: after every second the arithmetical average of the last 10 seconds is displayed.
5.3.3 FA - Density correction
Menu -> Settings -> Sensor -> FA Input -> Density correction
Liquids:
Liquids are virtually density resistant. No density correction needed.
Gases and vapours:
The density of gases and vapours can be strongly modified against pressure and temperature. Such severe
modifications have a minor impact on the measured value of a vane wheel sensor. This impact manifests itself in a determinable correction value, which is added to or subtracted from the measured value. The percentaged impact of this correction value is however negligible with average to high velocity flow. With low and
very low values, consideration of the density correction becomes more expediant.
To determine this correction value the measuring range initial value (starting value) of a vane wheel is
examined. The specified starting value in the vane wheel sensor documents arises from a medium density of
1.204 kg/m³ (calibration conditions). The only slightly deviating actual starting value, even with considerably
different working density of the medium (in the actual application) ensues in good approximation of the
following:
actual starting value = specified starting value x root of (density during calibration / working density of the
medium).
The correction value is now the difference between real and specified starting value. The characteristic of the
sensor is displaced by this value.
If the operating density of the medium is greater than the calibration density of 1.204 kg/m³, then the determined correction value must be deducted from the measured value. If it is less than the calibration density of
1.204 kg/m³, then the determined correction value must be added to the measured value.
The working medium density is needed to calculate the correction value.
Example:
A ZS25GE-mn40/100/p10 sensor with a specified starting value of 0.5 m/s is used in air at 1.013 bar and
100 °C, that is, with a working medium density of 0.946 kg/m³.
Entered in formula:
actual starting value = 0.5 m/s x root of (1.204 kg/m³ / 0.946 kg/m³) = 0.5 m/s x 1.128
= 0.564 m/s
correction value = 0.564 m/s – 0.5 m/s
= 0.064 m/s
With a displayed value of 15.00 m/s (without correction) and with density correction on, the correction value of
0.064 m/s would be allowed for and a corrected value of 15.06 m/s would be displayed.
Setting:
Selection: N = density correction no
Y = density correction yes then enter the density of the sample gas:
W-density/kg/m3: enter the working medium density in kg/m³
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sample gas
specific gas constant
in J/(kg*K)
sample gas
specific gas constant
in J/(kg*K)
dry air
287
hydrogen H2
4124
steam H2O
462
methane CH4
518
argon Ar
208
nitrogen N2
297
carbon dioxide CO2
189
oxygen O2
260
carbon monoxide CO
297
propane C3H8
189
helium He
2077
sulphur dioxide SO2
130
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If the working medium density is not known, it can be determined with the formula:
W-density = P / (R * T)
where P = absolute pressure in Pa, R = specified gas constant in J/(kg*K), T = temperature in K.
Here the specified gas constants of some gases:
5.3.4 FA – Operating conditions
Menu -> Settings -> Sensor -> FA input -> Operating conditoins
When choosing the relevant units (see 5.3.20.6) service temperature and working pressure are needed for
calculation purposes. The operating conditions can be entered in this menu or determined with connected
sensor.
5.3.4.1 Service temperature
Measured or entered unit in °C
5.3.4.2 Working pressure
Measured or entered unit in hPa
5.3.5 FA – Standard conditions
Menu -> Settings -> Sensor -> FA input -> Standard conditions
Standard conditions for Höntzsch are +21 °C (70 °F) and 1014 hPa (14.7 psia). Any standard can be set
via the standard temperature and standard pressure parameters.
5.3.5.1 Standard temperature
Input value in °C
5.3.5.2 Standard pressure
Input value in hPa
5.3.5.3 Standard density
Input value in kg/m³ depending on set standard conditions for calculating the mass flow rate.
5.3.6 FA - Pairs of values
Menu -> Settings -> Sensor -> FA Input -> Pairs of values
If pairs of values is selected (see 5.3.1.1), then the values stored here for determining the measured
value are applied as a calibration curve.
Selection: Configuration = enter the quantity of pairs of values (minimum 2, maximum 30)
for processing and display
Pairs of values = display and amend pairs of values.
A pair of values always consists of a velocity value in m/s
and a frequency value in Hz.
The condition being: the pairs of values must be ever
increasing, i.e. the next velocity and frequency value must always
be greater than the previous one.
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Example for quantity = 03
01:000.50m/s, 00010Hz
02:010.00m/s, 00350Hz
03:040.00m/s, 01770Hz
If the frequency measured value is greater than in the last pair of values, then the velocity value is
calculated. However, this means that the measurement uncertainty increases as this value is then outside
the calibrated range. The measuring range in the serial no. and technical data sheet must not be
exceeded, as this may cause permanent damage to the vane wheel! (For further information refer to
5.3.1).
Settings for vortex sensors VA:
5.3.7 VA - Basic settings
The connected vortex sensor determines the parameter type.
5.3.7.1 Type
Setting the type:
Refer to the relevant technical documents for selection options.
Selection: KKZ = the calibration number (KKZ) is individually determined for each
sensor and modifies the basic characteristics.
KKZ: enter as an 8-digit figure, in which each digit has a
0..9..A..F range (hexadecimal = 16 possible variables).
The actual KKZ can be found in the technical data sheet, calibration
certificate or directly on the sensor
5.3.8 VA - Measurement settings
The measuring task to be carried out determines the parameter, section and profile factor to be set.
5.3.8.1 Section
Setting the measuring section for measuring in pipelines for flow rate display:
Selection: Circular = for pipes with circular section
di/mm: enter the ID in mm
Rectangular = for pipes with rectangular section
a/mm: enter the inner surface a in mm
b/mm: enter the inner surface b in mm
5.3.8.2 Profile factor
The profile factor PF specifies the ratio of mean flow velocity in the measuring section and the flow velocity
measured from the sensor. Requirements are: centric sensor positioning, non-rotational inlet flow and
adequately dimensioned input/output sections. (See also Documents U155 and U206).
Following profile factors are to be set for vortex sensors VA40 subject to the pipe diameter:
Menu -> Settings -> Sensor -> VA Input -> Basic settings
pairs of values = special calibration characteristic specifically matched to the
measuring task based on up to 30 supporting points. Entering or
amending the points, see under 5.3.11.
The actual pairs of values are documented in the technical
documents.
Menu -> Settings -> Sensor -> VA Input -> Measurement settings
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Pipe ID
in mm
PF for VA40
Pipe ID
in mm
PF for VA40
80
0.719
160
0.808
90
0.729
170
0.819
100
0.738
180
0.830
110
0.750
190
0.839
120
0.761
200
0.842
130
0.773
300
0.845
140
0.784
400
0.850
150
0.796
...
0.850
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For measurements in larger free jet as well as larger ducts or measuring tubes PF = 1.000 results in the
local/punctual velocity.
With TABLE a profile factor subject to the set diameter of the measuring surface (5.3.8.1) is recommended. This value can be verified or also amended before saving. With rectangular selected as measuring surface, the surface is converted to circular for the proposed value and this value is approximate.
PF = 1.000 must always be set for VADi… measuring tubes calibrated with pairs of values!
5.3.8.3 Damping
The damping rate set here affects the measured value display, if VA is selected as sensor in the display
settings (5.3.20.1). Damping also affects the analog output, if VA is selected as the source (see 5.3.18).
Damping/s: enter the damping time from 01 to 99 seconds
Example 10 seconds: after every second the arithmetical average from the last 10 seconds is displayed.
5.3.9 VA – Operating conditions
Menu -> Settings -> Sensor -> VA Input -> Operating conditions
When selecting the relevant units (see 5.3.20.6) service temperature and working pressure are needed for
calculation purposes. The operating conditions can be entered in this menu, or determined with connected
sensor.
5.3.9.1 Service temperature
Measured or entered value in °C
5.3.9.2 Working pressure
Measured or entered value in hPa
5.3.10 VA – Standard conditions
Standard conditions for Höntzsch are +21 °C (70 °F) and 1014 hPa (14.7 psia). Any standard can be set
via the standard temperature and standard atmospheric pressure parameters.
5.3.10.1 Standard temperature
Input value in °C
5.3.10.2 Standard atmpospheric pressure
Input value in hPa
5.3.10.3 Standard density
Input value in kg/m³ depending on set standard conditoins for calculating the mass flow rate.
Menu -> Settings -> Sensor -> VA Input -> Standard conditions
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5.3.11 VA - Pairs of values
If pairs of values is selected (see 5.3.7.1), then the values stored here for determining the measured
value are applied as a calibration curve.
Selection: Configuration = enter the quantity of pairs of values (minimal 2, maximal 30) for
processing and display
Pairs of values = display and change of pairs of values.
A pair of values always consists of a velocity value in m/s
and a frequency value in Hz.
The condition being: the pairs of values must be ever
increasing, i.e. the next velocity and frequency value must always
be greater than the previous one.
Example for quantity = 03
01:000.50m/s, 00010Hz
02:010.00m/s, 00350Hz
03:040.00m/s, 01770Hz
Menu -> Settings -> Sensor -> VA Input -> Pairs of values
If the frequency measured value is greater than in the last pair of values, then the velocity value is
calculated. However, this means that the measurement uncertainty increases as this value is then outside
the calibrated range.
Settings for thermal sensors TA:
5.3.12 TA - Basic settings
The connected thermal sensor determines the parameter type.
5.3.12.1 Type
Setting the type of thermal sensor:
Refer to the relevant technical documents for selection options.
Selection: KKZ = the calibration number (KKZ) is individually determined for each
sensor and modifies the basic characteristics.
KKZ: enter as a 14-digit figure, in which each digit has a
0..9..A..F range (hexadecimal = 16 possible variables).
The actual KKZ can be found in the technical data sheet, calibration
certificate or directly on the sensor
5.3.13 TA - Measurement settings
The task to be carried out determines the parameter, section and profile factor to be set.
5.3.13.1 Section
Setting the measuring section for measuring in pipelines for flow rate display:
Selection: Circular = for pipes with circular section
di/mm: enter the ID in mm
Rectangular = for pipes with rectangular section
a/mm: enter the inner surface a in mm
b/mm: enter the inner surface b in mm
Menu -> Settings -> Sensor -> TA Input -> Basic settings
pairs of values = special calibration characteristic specifically matched to the
measuring task based on up to 30 supporting points. Entering or
amending the points, see under 5.3.15
The actual pairs of values can be found in the technical documents.
Menu -> Settings -> Sensor -> TA Input -> Measurement settings
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Pipe ID
in mm
PF for thermal
sensors TA10
25
0.725
27.2
0.740
35.9
0.790
40
0.810
41.8
0.820
50
0.840
...
0.840
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5.3.13.2 Profile factor
The profile factor PF specifies the ratio of mean flow velocity in the measuring section and the flow velocity
measured from the sensor. Requirements are: centric sensor positioning, non-rotational inlet flow and
adequate dimensioned input/output sections. (See also Documents U232 and U234).
Following profile factors are to be set for thermal flow sensors TA10 subject to the pipe diameter:
For measuring in larger free jet as well as larger ducts or measuring tubes with setting PF = 1.000 the
local/punctual velocity will be displayed.
with TABLE a profile factor subject to the set diameter of the measuring surface (5.3.13.1) is recommended. This value can be verified or also amended before saving. With rectangular selected as measuring surface, the surface is converted to circular for the proposed value and this value is approximate.
PF = 1.000 must always be set for TADi.. measuring tubes calibrated with pairs of values!
5.3.13.3 Pressure
Working pressure in hPa as absolute pressure for zero correction.
5.3.13.4 Damping
The damping rate set here affects the measured value display, if TA is selected as sensor in the display
settings (5.3.20.1). Damping affects the analog output, if TA is selected as the source (see 5.3.18).
Damping/s: enter the damping time of 01 to 99 seconds
Example 10 seconds: after every second the arithmetical average of the last 10 seconds is displayed.
5.3.14 TA – Standard conditions
Standard conditions for Höntzsch are +21 °C (70 °F) and 1014 hPa (14.7 psia). Any standard condition
can be set via the standard temperature and standard atmospheric pressure parameters.
5.3.14.1 Standard temperature
Input value in °C
5.3.14.2 Standard pressure
Input value in hPa
5.3.14.3 Standard density
Input value in kg/m³ depending on set standard conditions for calculating the mass flow rate.
Menu -> Settings -> Sensor -> TA Input -> Standard conditions
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5.3.15 TA - Pairs of values
If pairs of values is selected (see 5.3.12.1), then the values stored here for determining the measured
value are applied as a calibration curve.
Selection: Configuration = enter the quantity of pairs of values (minimal 2, maximal 30) for
processing and display
Pairs of values = display and change of the pairs of values.
A pair of values always consists of a velocity value in m/s
and a frequency value in Hz.
The condition being: the pairs of values must be ever
increasing, i.e. the next velocity and frequency value must always
be greater than the previous one.
Example for quantity = 03
01:000.50m/s, 06000Hz
02:010.00m/s, 08350Hz
03:040.00m/s, 12770Hz
Menu -> Settings -> Sensor -> TA Input -> Pairs of values
If the frequency measured value is greater than in the last pair of values, then the velocity value is
calculated. However, this means that the measurement uncertainty increases as this value is then outside
the calibrated range.
Note: For switching between different calibration gases each pair of values calibration for the respective
calibration gas can be saved in its own profile (see 5.3.26)
Resetting the factory settings (see 5.3.23) has no impact on the saved profile. Changing the pairs
of values for the various calibration gases can only be reconstructed via the documentation in the Technical Data Sheet and calibration certificate.
Pt100 input settings for temperature measurement :
5.3.16 Pt100 - Unit
The parameter unit to be set here affects the measured value display
Selection: °C = display of temperature in °C
°F = display of temperature in °F
Menu -> Settings -> Sensor -> Pt100 Input -> Unit
Analog input settings:
5.3.17 Analog input
Menu -> Settings -> Sensor -> Analog input
Input: Selection: 4-20mA = current input 4-20 mA is selected
0-10V = voltage input 0-10 V is selected
Designation: for each of the two inputs a designation of up to 13 digits for the sensor can
be entered.
Example: pressure sensor
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Equivalency: for each of the two inputs a display equivalency can be defined. For this
purpose the desired initial value of 4 mA or 0 V and the desired final value of
20 mA or 10 V is entered respectively.
Example: 4 ... 20 mA -> 900 ... 1600 hPA
Unit: for each of the two inputs a unit of up to 5 digits for measured value display
can be entered.
Example: hPa
(unused digits are marked with an "*" and are not shown in the display
and data logger)
Analog output settings:
5.3.18 Output
Settings for both analog output ports 1 and 2
5.3.18.1 Port
Selection of analog output port 1 or 2. Setting the selected port under (5.3.18.2)
5.3.18.2 Source
Setting the source and measuring value equivalency for the analog output port selected under 5.3.18.1.
Selection: FA, VA, TA = flow sensor depending on selection under (5.3.20.1)
equivalency: initial value analog output at 0 V in m/s
final value analog output at 10 V in m/s
example: 0 ... 10 V -> 0 ... 40 m/s
or: 0 ... 10 V -> 5 ... 20 m/s
Pt100 = temperature sensor Pt100
Equivalency: initial value analog output at 0 V in °C
final value analog output at 10 V in °C
example: 0 ... 10 V -> -20 ... +100 °C
Menu -> Settings -> Output
Counter settings:
5.3.19 Counter
5.3.19.1 Reset
Resets counter to 0
5.3.19.2 Decimals
Determines the number of decimal places (0, 1 or 2) for display
Menu -> Settings -> Counter
Display settings:
5.3.20 Display
Settings for measured value display. Determines the quantity of the simultaneously displayed values /
input channel and assignment of these values to the 3 channels.
5.3.20.1 Sensor
Selection: Sensor: = flow sensor selection
Menu -> Settings -> Display
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FA: = vane wheel sensor
VA: = vortex sensor
TA: = thermal sensor
Only the selected sensor may be connected!
5.3.20.2 Rows
The number of rows determines in how many input channels (1, 2 or 3) the measured values are
displayed simultaneously after switch on.
5.3.20.3 Row 1
Selection of which measured value is allocated to input channel 1 and displayed as Row 1.
Selection: Date = actual date
Time = actual time
(see 5.3.20.6 and 5.3.20.7)
Pt100 input = temperature sensor Pt100
20mA input = analog input 4-20 mA
10V input = analog input 0-10 V
TAT input = temperature measurement of thermal
Counter = counter (see 5.3.19)
5.3.20.4 Row 2
Selection of which measured value is allocated to input channel 2 and displayed as Row 2.
Selection: (see 5.3.20.3)
5.3.20.5 Row 3
Selection of which measured value is allocated to input channel 3 and displayed as Row 3.
Selection: (see 5.3.20.3)
5.3.20.6 Units for FA and VA sensors
Selection of unit for measured value display and data logger
Selection: m/s = flow velocity in meter / second
ft/min = flow velocity in feet / minute
section (FA: 5.3.2.2, VA: 5.3.8.1)
l/s = flow rate in liter / second calculated from flow velocity and
measuring section (FA: 5.3.2.2, VA: 5.3.8.1)
l/min = flow rate in liter / minute calculated from flow velocity
and measuring section (FA: 5.3.2.2, VA: 5.3.8.1)
cfm = flow rate in cubic feet / minute calculated from flow velocity
and measuring section (FA: 5.3.2.2, VA: 5.3.8.1)
kg/h = mass flow rate in kg / hour calculated from flow velocity and
Unit = unit of selected flow sensor
sensor TA (only relevant if a TA sensor is selected under
5.3.20.1)
m3/h = flow rate in m³/ hour calculated from flow velocity and measuring
measuring section (FA: 5.3.2.2, VA: 5.3.8.1), operating conditions (FA:
5.3.4, VA: 5.3.9), standard conditions (FA: 5.3.5, VA: 5.3.10) and the
entered standard density.
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N-m3/h = standard flow rate in standard-m³ / hour calculated from flow velocity and
measuring section (FA: 5.3.2.2, VA: 5.3.8.1), operating conditions (FA:
5.3.4, VA: 5.3.9) and standard conditions (FA: 5.3.5, VA: 5.3.10).
N-l/min = standard flow rate in standard-liter / minute calculated from flow velocity
and measuring section (FA: 5.3.2.2, VA: 5.3.8.1), operating conditions (FA:
5.3.4, VA: 5.3.9) and standard conditions (FA: 5.3.5, VA: 5.3.10).
5.3.20.7 Units for TA sensors
Selection of unit for measured value display and data logger
Selection: N-m/s = standard flow velocity in meter / second
N-ft/min = standard flow velocity in feet / minute
N-m3/h = standard flow rate in m³/ hour calculated from flow velocity, measuring
section (see 5.3.13.1) and standard conditions (5.3.14)
N-l/s = standard flow rate in liter / second calculated from flow velocity,
measuring section (see 5.3.13.1) and standard conditions (5.3.14)
N-l/min = standard flow rate in liter / minute calculated from flow velocity,
measuring section (see 5.3.13.1) and standard conditions (5.3.14)
N-cfm = standard flow rate in cubic feet / minute calculated from flow velocity,
measuring section (see 5.3.13.1) and standard conditions (5.3.14)
kg/h = mass flow rate in kg / hour calculated from flow velocity,
measuring section (see 5.3.13.1), standard conditions (5.3.14)
and the entered standard density.
Long-term measurement settings:
5.3.21 Long-term measurement
Menu -> Settings -> Long-term measurement
5.3.21.1 Mode
Setting measuring mode for long-term measurement
Selection: Start/Stop = Start/Stop mode for long-term measurement
Start = Start mode long-term measurement
also enter:
interval/s = duration seconds
Auto = automatic mode for long-term measurement
also enter:
interval/s = duration in seconds
no. of values = number of long-term measured values
Single measurements = single mode with averaging via individually saved values
Description of long-term measurement with selection of various measuring modes:
LM Start/Stop mode is set:
1. press LM-START to start long-term measurement. Displayed is the instantaneous value and the
measurement period in seconds (e.g. S00010) continually in the status field top right.
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2. press LM-STOP to stop long-term measurement, the display is frozen and the average value is
displayed above the measurement period in seconds (e.g. S00030).
3. press LM-OK to exit display of average value, the instantaneous value is once again displayed and
is ready for a new measurement. Start a new measurement as described under 1.
LM Start mode is set:
1. press LM-START to start long-term measurement. The instantaneous value is displayed and the
duration of measurement in seconds (e.g. S00010) is displayed continually. The bar above the control key
description shows the progress of the measurement period in relation to the set interval.
2. press LM-STOP before reaching the set interval and long-term measurement stops, the display is
frozen and the average value is displayed above the measurement period in seconds (e.g. S00020).
If LM-STOP is not activated, the measurement period runs up to the set interval, then long-term
measurement is stopped, the display is frozen and the average value is displayed above the measurement
period in seconds (e.g S00030).
3. press LM-OK to exit display of average value, the instantaneous value is once again displayed and
is ready for a new measurement. Start a new measurement as described under 1.
LM Automatic mode is set:
1. if LM-START is pressed, long-term measurement commences, in the 1st interval displaying the
instantaneous value, in the status field top right the measurement period in seconds (e.g. S00010)
continually and below this the number of measured values (R00001). The bar above the control key
description shows the progress of the measurement period in relation to the set interval. Ater the 1st
interval has elapsed the display is frozen and the next interval starts automatically, displaying the average
of the previous interval during the set length, the measurement period in seconds continually in the status
field and below it the number of values (R00002), ...
2. if LM-AUTO is pressed before the set number of long-term measurement transmissions is reached,
then long-term measurement is aborted and awaits a new input as under 1.
If LM-AUTO is not activated, the measurement period runs to the end of the set number of intervals, longterm measurement is then stopped, the display frozen and displays the last average value above the
displayed measurement period in seconds in the status field top right, and below it the number of
recorded values.
3. press LM-OK to exit display of average value, the instantaneous value is once again displayed and
is ready for a new measurement. Start a new measurement as described under 1.
If the data logger is switched on (see 5.3.24.1), the displayed average is saved to the data logger
with time stamp after each interval sequence, in the 3 modes described above.
LM single measurement mode is set:
1. each time LOG + is pressed the displayed instantaneous value is buffered as an individual value
and the number of the buffered values (e.g. +00010) is displayed in the status field top right.
2. by pressing LOG – the last recorded individual value is deleted and in the status field top right the
number of buffered values (e.g. +00010) is reduced by one. At the most the last 10 individual values may
be discarded.
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3. by pressing AVG the average value of the buffered single measurements is calculated and shown
on the frozen display and the number of single measurements used for averaging are displayed in the
status field.
4. by pressing LOG-OK display of the average value is exited, the instantaneous value is once again
displayed and is ready for a new measurement. Start a new measurement as described under 1.
If the data logger is switched on (see 5.3.24.1), the average is saved to the data logger with time
stamp by pressing AVG.
Device settings:
5.3.22 Device
The parameter to be set here affects the flowtherm NT
Selection: Date: = sets the actual date
Time: = ses the actual time
When changing the batteries the date and time are buffered for several
hours.
Supply: = battery: 4 Alkali-Mangan Mignon (AA)
accumlator: 4 NiMh Mignon (AA)
this setting influences the battery charging level display
Light: = display light On or Off after switching on the device
Language: = selection of man-machine language German, English, French or
Factory settings:
5.3.23 Factory settings
The flowtherm NT is reset to factory settings, all settings are lost if they have not been previously saved
to a profile of their own (see 5.3.26).
The factory settings are preset as those found in the shipping documents. The values of customer or
application-specific measuring tasks as defined in the documents are taken into account.
Before restoring the factory settings the following confirmation prompt appears:
Restore factory setting? Confirm with . Cancel with or MESS.
Menu -> Settings -> Device
Japanese
Menu -> Settings -> Factory settings
Before resetting to factory settings save the actual settings to a profile (see 5.3.26), otherwise they
will be lost. Cancelling the factory settings does not affect the saved profile.
Data logger:
5.3.24 Data logger
The data logger is for saving measured values generated in various measuring modes of long-term or
single measurement (see 5.3.21.1). The contents of the data logger can be viewed on the unit or downloaded, saved and subsequently processed via the USB port on a Windows PC with help of the optional
HLOG II software.
The measured values, defined under (5.3.20) for rows 1...3 are saved to the data logger. Date and time
are not logged separately, if these have been selected for measurement display.
Menu -> Data logger or LOGGER
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Note: In this way the possible number of data records to be logged can be increased, as the length of the
data record is thus reduced. This has no impact on the time stamp for the logged values.
5.3.24.1 On / Off
Selection: Data logger: = On or Off
Switch data logger on or off
With data logger on the data for long-term measurement
(see 5.3.21) is saved to the data logger
The data logger can also be switched on from the measured value
display with LOGGER (via Selection: Settings -> Data logger)
or with LOGGER-OFF switched off.
5.3.24.2 View
The contents of the data logger are shown on the display:
With to the next data set
With back to menu
With or MESS back to measured value display
5.3.24.3 Settings
Designation: = freely adjustable measuring point designation with max. 8 digits for
all subsequently saved data logger values until entering a new measuring
point designation.
5.3.24.4 Delete
Delete the contents of the data logger:
Before deleting a prompt appears:
Delete data logger? Confirm with . Cancel with or MESS.
All the values saved to the data logger are deleted accordingly.
Before deleting, the data logger contents should be downloaded and saved via the USB port to a
Windows PC with the help of the optional HLOG II software, otherwise they will be lost.
Device status:
5.3.25 Device status
Display of status:
Hardware: = hardware version
Software: = software version
S. No.: = serial no.
Memory/%: = display of free space for data logger in %
Battery/%: = display of battery capacity in %
"0" is displayed when supply is via the USB connection.
Profile: = last loaded profile (see 5.3.26)
Menu -> Status
When the battery symbol appears for the first time in the satus field top right
there is approx. 10 % battery capacity available.
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When using rechargeable batteries, "rechargeable" must be selected in the settings (5.3.22) otherwise the battery capacity display will be incorrect!
Device profiles:
5.3.26 Device profiles
The entire parameter inputs can be saved in the profiles under a freely definable name with up to 8 characters and can subsequently be reloaded.
For example, all parameter inputs for a specific sensor can be saved to a profile or also to an appointed
measuring point.
Up to 100 different profiles can be saved. Available profile storage locations are marked with an * after
the profile name. Profiles cannot be deleted but may be overwritten.
Selection: Load: = loading a saved profile by selecting from the list
Save: = saving the active parameter settings to a profile by selecting from the
list in an available profile storage field and input of a new name or in
an already occupied profile storage location by overwriting and changing
or retaining the name
Keys:
5.3.27 Key F3 - LM-Start
5.3.28 Key 4 Switch off / OFF (reset)
If the device no longer reacts to keypad entry, hold this key down for longer than 10 seconds to switch off
and reset.
Menu -> Profiles
Returning to the factory settings (5.3.23) has no impact on the saved profiles.
Funktion key for operating long-term measurement (see 5.3.21)
Funktion key for switching off the device; active in all menus except during long-term measurement.
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Fault
Cause
Troubleshooting
Device cannot be
switched on
Dead batteries
Insert new / re-charged batteries
Faulty electronics
Return to Höntzsch
No measured value
display or
analog output = 0V
no value
Sensor contaminated
Clean according to instructions
Profile factor set at 0.000
Set profile factor to the corresponding value of
nominal diameter and sensor type
Unit setting (5.3.20.1) does
not correspond to the connected flow sensor
Adjust the setting (5.3.20.1) to the connected
sensor or connect compatible sensor
Analog output = 0V
no value
Output setting does not
match the port or source
(5.3.18)
Amend output setting port or source (5.3.18)
Measured value too
low
Sensor type or KKZ set incorrectly
Compare and correct settings according to
details in the Technical Data Sheet
Sensor contaminated
Clean according to instructions
Profile factor set too low
Set profile factor to the corresponding value of
nominal diameter and sensor type
Input/output section too
short
Change sensor position; improve flow
conditions with a flow rectifier straightener
Rotational flow
Reposition sensor in flow direction; use flow
rectifier straightener
Vortex VA sensors:
reduced acoustic coupling in
the sensor elements as a
result of vibration or impact
Return sensor to Höntzsch for checking
Measured value too
high
Sensor type or KKZ set
incorrectly
Compare and correct settings according to
details in the Technical Data Sheet
Incorrect scaling of analog
output
Check settings and amend if necessary
Profile factor set too high
Set profile factor to the corresponding value of
nominal diameter and sensor type
EMC problem
See reference to electromagnetic compatibility
(EMC) in the sensor documents
_________________________________________________________________________________________________
6 Troubleshooting
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7 Replacement Parts
- upper housing with keypad
- lower housing
- battery compartment cover
- seal for upper housing
- connector socket cap
- USB connection cover
- 12-pin connector plug
8 Instruction Manual Category 3G flowtherm NT
8.1 Equipment
Handheld flowtherm NT for connection of vane wheel flow sensors FA as probe and measuring tube, vortex
flow sensors VA40 or VADi, thermal flow sensors TA10 or TADi, as well as temperature probes Pt100.
Use in compliance with regulations
The flowtherm NT with above-mentioned category 3G sensors is designed for measuring the flow velocity,
the volume flow and the temperature of gases, and also of liquids with specified vane wheel flow sensors
FA and Pt100 for application in areas in which category 3G equipment is required.
During normal operation within the limits of the technical specifications the equipment does not generate
sparks and there is no intrinsic heating.
The flowtherm NT with respective sensors may not be used
in areas in which category 1G or 2G equipment is required
in areas in which category 1D, 2D or 3D equipment is required
8.2 Safety Instructions
Read the Instruction Manual carefully before initial operation! Failure to do so may cause an explosion!
The flowtherm NT with Ex sensors for category 3G and 3D is to be used only in areas in which the ambient
temperature range of the housing does not exceed 0 to +50 °C. See also details on the type plate of the
flowtherm NT or sensor as well as the relevant technical documents.
The maximum permissible temperature of the medium in categorie 3G areas corresponds to the
temperature class. See also details on the type plate as well as the relevant technical documents.
The container for the measuring gas is to be insulated in such a way as to guarantee that the device housing does not reach a higher temperature than the afore-mentioned maximum ambient temperature; also
taking radiant and convective heat into consideration.
Category 3G equipment listed under Section 8.1 is to be used solely in areas in which the temperature of
the measured gas, the ambient temperature and the maximum permissible pressure overload stated on
the type plate is not exceeded.
Sensors for use in pressurized pipelines are to be inserted or retracted in depressurized conditions only.
Non-oberservance may result in serious injuries to personnel.
Switch off the supply voltage before disconnecting the cable socket.
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Marking:
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8.3 Technical Data
Explosion protection: vane wheel sensors FA, vortex sensors VA and temperature probes Pt100
Ex nA IIC T6 X
Explosion protection: thermal sensors TA
Ex nA IIC T4 X
X: Please note the precautions for hazardous areas (see 1.3)
8.4 Installation
The current European Specifications for Assembly, the recognised standards of good practice and this
Instruction Manual apply.
8.5 Maintenance
Any maintenance and repair work is to be carried out solely by Höntzsch GmbH.
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We, Höntzsch GmbH
Gottlieb-Daimler-Str. 37
D-71334 Waiblingen
bearing sole responsibility, hereby declare that the product
flowtherm NT
handheld unit
referred to by this declaration is in conformity with the following standards or normative documents:
Provisions of the Directive
Reference no. and date of issue
2014/34/EU: Equipment and Protective Systems in
potentially explosive atmospheres
EN 60079-0: 2012
EN 60079-15: 2010
2014/30/EU: Electromagnetic Compatibility
EN 61000-6-4: 2007 + A1: 2011
EN 61000-6-2: 2006 + Corrigendum 1: 2011
2014/68/EU: Pressure equipment
2011/65/EU: Hazardous Substances in Electrical
and Electronic Equipment
Höntzsch GmbH
Gottlieb-Daimler-Straße 37
D-71334 Waiblingen (Hegnach)
Tel: +49 7151 / 17 16-0
Fax: +49 7151 / 5 84 02
E-Mail info@hoentzsch.com
Internet www.hoentzsch.com
Subject to alteration
Waiblingen, 20.04.2016 Thomas Itte / Managing Director
_________________________________________________________________________________________________
9 Declaration of conformity
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