hontzsch flowtherm NT.2 Handheld flowtherm Instruction Manual

flowtherm NT.2 Handheld flowtherm
Instruction Manual

Multifunctional handheld unit with data logger for measuring flow rate, flow velocity, temperature, pressure and other variables

Overview and brief introduction of controls and connections

Please ensure that the correct sensor (FA, VA or TA) is selected (see under 5.3.19.1)!

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 conditions; 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

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

1.2 Handling batteries and accumulators

– All batteries/accumulators must be replaced at the same time. Do not replace single cells! All replacements 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

Scope of Delivery

– Handheld unit flowtherm NT.2
– Operating Instructions and Data Sheet flowtherm NT.2
– 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.2 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: Sensors that can be connected:
– vane wheel FA, FAR, FT, FADi, FAR-Di – vortex VA, VAT, VADi – thermal TA10, TADi
– temperature Pt100 – 2-wire 4-20 mA max. 12 V supply
– 3- or 4-wire 4-20 mA output and max. 12 V supply
– 3- or 4-wire 0-10 V output and max. 12 V supply

The following type plate is found on the back of the unit:

www.hoentzsch.com

Description of type plate specifications:

1. Description see Section 2.1

2. Unit and serial no.

3. Year of production

4. Inputs
   see Description Section 2.1
   see Connector sockets Page 2
   see Wiring diagrams Section 4.1 and 4.2

5. USB connection
   see Electrical data Section 3.2 and 3.3
   see Connector sockets Page 2

6. Power supply
   see Electrical data Section 3.2 and 3.3

7. Operating conditions
   see Safety Instructions Section 1
   see Operating conditions Section 3.1

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 inputs or additional sensors
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 permissible nominal capacity 4000 mAh per cell) running time (Duracell Industrial)  approx. 30 hours (using FA sensor with minimum display light) or via 4 NiMH rechargeable Mignon (AA) 1.2V batteries running time (Ansmann Digital 2850 mAh) approx. 31 hours (using FA sensor with minimum display light) In order to extend the operating time the mode „auto-off“ has to be activated.
If this mode is activated the display turns off automatically after a few minutes without pressing any keys.
Turning off the 12 V output for power supply of potential connectable sensors extends the operating time as well.

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; input voltage Um £ 6 VDC
---|---
Supply current| : via USB connection not less than 300 mA
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 £ 1 MOhm
£ 12 V power supply for sensors, (£ 25 mA); allocation of unit, initial value and final value adjustable

3.4 Measurement uncertainty

: +/- 1 Kelvin
Temperature display
Analog input 0-10 V| : +/- (0.3 % of measured value + 0.02 % FS)
Analog input 4-20 mA| : +/- (0.3 % of measured value + 0.02 % FS)
Input Pt100| : +/- 0.2 Kelvin

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.

Initial Operation/Startup

For installation and operation of the system the national regulations currently in force, the recognised standards of good practice and these Operating Instructions apply.

4.1 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

4.2 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.
Note: 12 V output for power supply of connectable sensors can be switched on/off, see 5.3.21

4.2.1 Analog input 4-20 mA (2-wire system current for 12V supply)
A = power supply + (12V)
F = power supply – (GND)  plug shell = shielding

4.2.3 Analog input 0-10 V (3 or 4-wire system voltage for 12V supply)
A = power supply + (12V)
B = power supply – (GND_D)
G = signal +
H = signal – (GND_A) plug shell = shielding

Operation

5.1 Key functions

Switch on:| with the ok   key (also symbol) hold down until text appears in the display.
---|---
Switch off:| with the **f4**  key (also  symbol) press the key for 1 second until the display goes off.
Control keys:| f1, f2  and f3  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. Switching to  1, 2 or 3 measured values or displaying the grapphical view. Depending on the selection, the character size of the  display value changes.  and  : if the display is set so that only measured values from 1, 2 or 3
input channels are displayed simultaneously or the graphical view is displayed, then these keys can be used for  scrolling 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 waking up the display from the energy  saving mode or to reset the brightness of the display to the chosen level after it has been dimmed. In the menus and  input boxes: ok**   is a control key to select and save.

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 ok select and save and return to selection list.
With f1 return to measured value display without saving.
With f2 return to selection list without saving.
With f4** 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 ok select and save and return to selection list.
With f1 return to measured value display without saving.
With **f2** return to selection list without saving.
With f4 switch off.

5.2 Setup menu after switch on

5.3 Parameter settings
Settings for vane wheel sensors FA:
5.3.1 FA – Basic settings
Menu -> Settings -> Sensor -> FA input -> 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: cylinder probes with OD 14, 16, 18 mm measuring tubes with ID 9.7 mm
---|---
mn| mini  for use in for instance: cylinder probes with OD 25 mm measuring tubes with ID 18.2 mm
md| midi  for use in for instance: cylinder probes with OD 30 mm
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:

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:

Pipe ID
in mm| PF for ZS16 (mc)
0.914| PF for ZS18 (mc)
0.898| PF for ZS25 (mn) and ZS30 (md)
---|---|---|---
40
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.| 1.| 0.882
.
170| 1.| 1.| 0.938
.
180| 1.| 1.| 0.945
.
220| 1.| 1.| 0.955
| 1.| 1.| 0.960

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!

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 (5.3.19.1).
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) ensures 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.

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/(kgK), T = temperature in K.
Here the specific gas constants of some gases:

sample gas| specific gas constant
in J/(kqK)| sample gas| specific gas constant
in J/(kqK)
---|---|---|---
dry air| 287| hydrogen H2| 4124
steam H2O| 462| methane CH4| 518
argon Ar| 208| nitrogen N2| 297
carbon dioxide CO2| 189| oxygen 02| 260
carbon monoxide CO| 297| propane C3H8  sulphur dioxide SO2| 189
130
helium He| 2077

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:

For measurements in larger free jet as well as larger ducts or measuring tubes PF = 1.000 results in the
local/punctual velocity.

With f3 TABLE a profile factor subject to the set diameter of the measuring surface (5.3.8.1) is recom- mended. 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.

PC connection

The USB interface of the flowtherm NT.2 can be used to establish a connection to a PC. With the Höntzsch software HLOG II (from version 1.7) the flowtherm NT.2 can  be configured and the data logger of the handheld unit can be read out.

Troubleshooting

batteries
Faulty electronics| Return to HOntzsch
No measured value display
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 (5.3.19.1) does not correspond to the con- nected flow sensor| Adjust the setting (5.3.19.1) to the connected sensor or connect compatible sensor
Measured value too low| Sensor type or KKZ set incor- rectly| 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 straightener
Rotational flow| Reposition sensor in flow direction; use flow straightener
Vortex VA sensors:
reduced acoustic coupling in the sensor elements as a result of vibration or impact| Return sensor to HOntzsch for checking
Measured value too high| Sensor type or KKZ set incorrectly| Compare and correct settings according to details in the Technical Data Sheet
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

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

Installation

The current European Specifications for Assembly, the recognised standards of good practice and this Instruction Manual apply.

Maintenance

Any maintenance and repair work is to be carried out solely by Höntzsch GmbH & Co. KG.

Declaration of conformity

We
Höntzsch GmbH & Co. KG
Gottlieb-Daimler-Str. 37
D-71334 Waiblingen bearing sole responsibility, hereby declare that the product handheld unit flowtherm NT.2 referred to in this declaration, is in conformity with the following standards or normative documents:

EN 61000-6-2: 2006 + Corrigendum 1: 2011
2011/65/EU: Hazardous Substances in Electrical and Electronic Equipment|

Höntzsch GmbH & Co. KG
Gottlieb-Daimler-Straße 37
D-71334 Waiblingen
Tel: +49 7151 / 17 16-0
E-Mail info@hoentzsch.com
Internet www.hoentzsch.com

References

• Messgeräte von Höntzsch ⇒ Strömung- & Durchflussmessung

Read User Manual Online (PDF format)

Download This Manual (PDF format)

Download this manual  >>