Wohler DC 410FLOW User manual

The Measure of Technology
Manual
Pressure Differential and Flowmeter
Art. n°. 22627 –2012-08-26
Wöhler DC 410FLOW
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

Contents
2
Contents 1General Information..............................4
1.1 Operation Manual Information....................... 4
1.2 Notes............................................................. 4
1.3 Intended Use................................................. 4
1.4 Basic equipment............................................ 5
1.5 Transport....................................................... 5
1.6 Information on disposal................................. 5
1.7 Manufacturer................................................. 5
2Specifications........................................6
2.1 Measured Data.............................................. 6
2.2 Calculated Values ......................................... 7
2.3 Logger........................................................... 9
2.4 Technical Data ............................................ 10
3Component Explanation ....................11
3.1 Basic Unit.................................................... 11
3.2 Probes and Components............................. 13
3.3 Function ...................................................... 15
3.4 Functions..................................................... 16
3.5 Display and Key Setup................................ 16
4Getting Started....................................18
4.1 Check Battery Status................................... 18
5Operation.............................................20
5.1 Turning the Pressure Computer on and Self
Check.......................................................... 20
5.2 Measuring ................................................... 20
5.3 Special Tips................................................. 21
6Measurement Modes in the Main
Menu 23
6.1 Selecting the Main Menu............................. 23
6.2 Option „Air Speed“....................................... 23
6.2.1 Measuring the Air Speed............................. 24
6.2.2 Theoretical Background .............................. 25
6.3 Option „Airflow (Pitot)“ ................................. 26

Contents
3
6.3.1 Measuring the Airflow (Pitot)........................26
6.3.2 Grid-point Measurements ............................27
6.4 Option „Airflow (k value)“ .............................30
6.4.1 Theoretical Backround.................................30
6.4.2 Connecting the Wöhler DC 410Flow to the
Vent.............................................................31
6.4.3 Performing the Test.....................................32
6.5 Option “4 Pa Test“ .......................................34
6.6 Option „Energy Utilization Check“................38
6.7 Option „U value“...........................................45
6.8 Option “Volume“...........................................46
6.9 Graph / Record............................................48
6.10 Printing out Measurement Records .............50
6.11 Option "Save measurements"......................51
6.12 Option "SETUP"...........................................51
7Option 'Data management' ................53
7.1.1 Save Customer Records..............................54
7.1.2 Creating a New Customer Folder ................55
7.2 Option "Data management".........................56
7.3 Data Transfer with the PC or Notebook.......56
7.4 Data Logging ...............................................56
8Troubleshooting .................................57
9Maintenance........................................57
9.1 Maintenance work........................................57
10 Warranty and Service.........................58
10.1 Warranty......................................................58
10.2 Service.........................................................58
11 Accessories.........................................59
12 Declaration of conformity..................60
Points of sale and service............................61

General Information
4
1General Information
1.1 Operation Manual
Information
This operation manual allows you to work safely
with the Wöhler DC 410FLOW. Please keep this
manual for your information.
The Wöhler DC 410FLOW Flow and Pressure Meter
should be employed by professionals for its in-
tended use only.
Any damages caused by not following this manual
are excluded from liability.
1.2 Notes
WARNING!
Not following this warning can cause injury or
death.
ATTENTION!
Not following this note can cause permanent
damage to the device.
NOTE!
Useful information
1.3 Intended Use
The meter can be used for the measurement of
differential pressure, airflow, air speed and tem-
perature as well as for the registration of humidity
and barometric pressure. It is especially designed
for the following purposes:
Acceptance measurements at ventilation
systems according to DIN EN 12599.
4 PA Pressure Test to confirm the combustion
air availability.
Measurement of the ventilation loss and the
surface loss
Flow pressure, installation pressure, standing
pressure, jet pressure
Flow measurement in air and flue gas ducts
Data logger

General Information
5
1.4 Basic equipment
Meter
Components
Wöhler DC 410FLOW
Flow and Pressure
Meter
2 capillary tubes
Batteries
Plastic case
1.5 Transport
ATTENTION!
Improper transport can harm the instrument.
Always transport the instrument in the provided
carrying case in order to prevent damage. The
pressure connectors have to be protected by the
protection cap.
The case is included in the sets and can also be
bought separately.
1.6 Information on disposal
Electronic equipment does not belong into domes-
tic waste, but must be disposed according to the
applicable statutory provisions.
You may hand in any defective batteries taken out
of the unit to our company as well as to recycling
places of public disposal systems or to selling
points of new batteries or storage batteries.
1.7 Manufacturer

Specifications
6
2Specifications
2.1 Measured Data
Differential pressure
Description
Data
Range
±100 hPa
Accuracy
< 3 % of the reading, if
the value is < ± 10 Pa,
better than
± 0.3 Pa
Resolution
0.1 Pa at
-1,100 Pa to
+1,100 Pa, otherwise
1 Pa
Measurement of very small pressures
Description
Data
Range
± 100 Pa
Accuracy
< 3 % of the reading, if
the value is < ± 10 Pa,
better than
± 0.3 Pa
Resolution
± 0,01 Pa
Temperature (internal sensor)
Description
Data
Range
-20 °C to 60°C
Accuracy
< ± 1 °C
Resolution
0.1°C

Specifications
7
External temperature probe
(optional, e.g. with Measuring Pli-
ers for Temperature Measurement
or Special Wall Temperature
Probe)
Description
Data
Range
2 canals, -20.0 °C to
+800.0 °C
Accuracy
< ± 2 °C at 0°C to
133°C, otherwise 1.5
% of the value, ac-
cording to the directive
EN 50379-2
Resolution
0.1°C
Relative humidity
(internal sensor)
Description
Data
Range
0 % to 100 % rh (rela-
tive humidity), non
condensing
Accuracy
< ± 2 % RH, in range 0
to 90 % RH, otherwise
< 3 % RH
Resolution
0.1 % RH
Barometric Pressure
(integrated barometric pressure
sensor)
Description
Data
Range
±300 hPa to 1,100 Pa
Accuracy
< ± 1.5 % hPa of rea-
ding
Resolution
0.1 hPa
2.2 Calculated Values
Variable
Calculation
Pressure units
hPa, Pa, mmH2O, PSI, inwc,
bar, mbar, conversion ac-
cording to the general con-
version rules
Temperature
unit
°C and °F, conversion ac-
cording to the general con-
version rules

Specifications
8
Air speed
Description
Data
Range
0.3 m/s to 120 m/s
Resolution
0.01 m/s
Continuous density
correction
automatic, with
temperature signal

Specifications
9
2.3 Logger
Description
Data
Extent
9999 measurements,
each with the meas-
ured value of pressure
and humidity and
three temperature
values (if the external
temperature sensors
are connected) can be
stored in the internal
memory. The user can
set the log rate from 1
second to 24 hours.
USB interface for data
transfer to a PC
Permanent online da-
ta, already during the
registration
User adjustable log
rate
Sampling interval of 1
second to 24 hours
can be set.
NOTE!
Ensure that the meter is connected to the power
supply or that the batteries are charged.

Specifications
10
2.4 Technical Data
Description
Data
Current consumption
4 AA rechargeable
batteries or 4 AA
disposable batteries
1.5 volt
- working mode:
ca. 60 mA,
- off-mode and log
mode:
ca. 45 µA for clock
and processor
Interfaces
USB- (COM-Port),
data transfer to the PC
It is possible to trans-
fer the data directly
from the meter to the
Wöhler TD 600 ther-
mal fast printer.
Storage temperature
-20 °C to +60 °C
Operating temperature
5 °C to +40 °C
Mass
ca. 365 g, with batter-
ies and integrated
magnet
Dimensions
80 x 550 x 60 mm
Date and time
Date and time are
included in the meas-
urement report
Internal memory
2 MB

Component Explanation
11
1
3
3Component Explanation
3.1 Basic Unit
Fig. 1: Overview
2
4
5
6
7
8
©
©
9
©
©
10
11
12

Component Explanation
12
Number
Function
1
Mini-USB-Port
2
Connection for protection cap
3
Power jack
4
Color display
5 ESC key
context-sensitive
Escape
NOTE!
Keeping this button pressed will always call up the
main menu.
6 Arrow keys
The function changes according to the context. Scroll
up and down.
7 ENTER
and On-/Off key
a) Confirm the setting.
b) The function of the key changes according to the
context.
c) Press and hold the key for 3 seconds to turn off the
unit.
8 Infrared interface
Thermal fast printer to print out the measurement report
9 Overpressure socket
(+)
Main connection
10 Underpressure so-
cket (--)
Reference socket for the measurement of the the dif-
ferential pressure and static socket for the S-tube probe
11, 12
Standard jacks for temperature probes NiCr-Ni
14
Battery cover (in Fig. 1 on the rear side)
There are diffusion openings for the internal registration
of humidity and temperature on the rear side of the
Wöhler DC 410FLOW. The internal temperature meas-
urement is necessary for the temperature compensa-
tion of the pressure sensor.

Component Explanation
13
3.2 Probes and Components
Fig. 2: S-tube probe
S-tube probe for measuring the air speed (see
chapter 6.2) and the airflow (see chapter 6.3).
Insert the plug of the S-tube probe into jack 11
(Fig. 1) of the Wöhler DC 410FLOW.
Connect the overpressure hose (turned against
the flow) of the S-tube probe to the overpres-
sure socket (+) (Fig. 1, part 9) and the
underpressure hose to the underpressure
socket (-) (fig. 1, part 10).
Fig. 3: Capillary tube
Capillary tube for the 4 PA test. Two capillary tubes
are necessary.

Component Explanation
14
Fig. 4: Connecting a temperature
measuring plier
Two temperature measuring pliers can be con-
nected at the same time.
Insert the plug of the temperature measuring
pliers into the jacks 11 and 12 (Fig. 1) of the
Wöhler DC 410FLOW.
The temperature value measured by the meter
connected to jack 11 will be indicated in the display
as T1 and the one measured by the meter con-
nected to jack 12 will be shown as T2.
NOTE!
Any thermocouple type K may be connected to
the jacks 12 and 13.
Fig. 5: Connecting the Special Wall
Temperature Probe for measuring the
heat transmission coefficient
Connecting the Special Wall Temperature Probe
for measuring the heat transmission coefficient
(See chapter 6.7). Two Special Wall Temperature
Probes can be connected at the same time.
Insert the plug of the Wall Temperature Probes
into the jacks 11 and 12 (Fig. 1) of the Wöhler
DC 410FLOW.

Component Explanation
15
3.3 Function
Pressure
sensor
Pressure socket (+)
Absolute-pressure
and humidity sen-
sor
Fig. 6: Interior structure of the meter
Pressure socket (-)

Component Explanation
16
3.4 Functions
The Flow and Pressure Meter Wöhler DC 410FLOW
is a high precision multimeter for the measure-
ment of differential pressure, volume flow and
temperature as well as the registration of humidity
and barometric pressure. Because of its extremely
high precision, the meter measures even very
small pressures. Therefore it is ideal to determi-
nate the air speed, gas pressure, volume, tension
and also the flue gas temperature is registered. A
maximum measuring range up to 100 hPa and a
burst pressure of 0.75 bar provide a sufficient
degree of security even for high pressure ranges.
3.5 Display and Key
Setup
Fig. 7 : Display and keys
The Wöhler DC 410FLOW has a color 2.4' display.
The OLED-technology allows reading the display
from almost every angle of view.
Below the display four keys are available to oper-
ate the Wöhler DC 410FLOW.
Escape
Scroll/Zoom
On/Off

Component Explanation
17
The display is divided into a status, a menu and a
readings segment.
The currently selected task is shown in the left
status segment.
- Date and time, customer (if selected), system
diagnosis status and battery level are shown in
the status segment on the right.
The readings segment displays the readings or
the menu items.
The menu segment is situated at the bottom of the
display. It consists of three soft keys.
Fig. 8: Display details

Getting Started
18
4Getting Started
4.1 Check Battery Status
Fig. 9: Position of the batteries in the
Wöhler DC 410FLOW
When the device is switched on, the battery indi-
cation is displayed in the upper right hand corner
of the screen. A fully charged set of batteries is
shown as a solid green battery symbol. An empty
red symbol indicates discharged or empty batter-
ies. If the batteries are almost empty the back light
will dim out. The warning "charge batteries" will
appear. In this case, finish the measuring process
as soon as possible.
WARNING!
Incorrect use of batteries can cause injury!
Never expose the battery to fire or high tempera-
tures. Danger of explosion!
Liquids can leak out of the batteries due to mis-
treatment. Never touch the liquid. If you got in
contact to the liquid remove it with water. If the
liquid got into your eyes, remove it with water and
see your doctor as soon as possible.
WARNING!
Risk of electrical shock!
Never touch the power supply with wet hands!
Protect the power supply against water and mois-
ture!
Do not unplug the recharger by pulling the cable!
Do not use the power supply when the voltage
requirements of the recharger and the supply do
not match!
The batteries can be recharged even while they
are located in the analyzer.
NOTE!
You can still go on measuring while battery
charging is in progress.

Getting Started
19
ATTENTION!
- Ensure rechargeable batteries are equipped in
the DC 430FLOW before charging. Never try to
charge disposable batteries.
Use 4 AA rechargeable batteries only.
- Only use the Wöhler charger.
How to charge the batteries:
Before you plug the recharger into the outlet,
connect it with the charging connection of the
DC 430FLOW (Fig. 1, part 3)
Fig. 10: Open the battery compartment.
Standard AA rechargers can be used for external
charging when the batteries are not located in the
analyzer.
To remove the batteries from the DC 430FLOW
open the battery compartment cover by press-
ing the clip and pushing the battery compart-
ment cover at the same time.
Recharging empty batteries can take up to 3
hours.
NOTE!
To ensure maximum capacity use batteries of
same age and condition only. Always replace a
full set of batteries when necessary.

Operation
20
5Operation
5.1 Turning the Pressure
Computer on and Self
Check
Fig. 11: Key pad with on/off-key
Fig. 12: Zeroing
ATTENTION!
Before the meter is used, a visual check must
ensure each and every time that all functions
work properly.
Turning on the meter: Press on/off-key (on the
right)
The Meter will automatically start with a 10 se-
cond self test and zeroing.
ATTENTION!
Do not connect any hose while the meter is per-
forming the self check and do not expose it to
any differential pressure, because the pressure
sensor will automatically be zeroed during the
self test.
5.2 Measuring
Fig. 13: Measuring mode
After that the meter will automatically switch to the
measuring mode.
Al readings (measured and computed values) will
be shown continuously in the readings segment.
The following functions can be selected from the
menu segment
"Menu" key: opens the main menu
Zoom: Turns the zoom-mode on and off (hold-
ing the button pressed).
Option „PD=0“: Differential pressure The pres-
sure sensor will be zeroed once again.