TESTO 420 User manual

testo 420 ·Differential Pressure Instrument
Instruction manual
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1 Contents
3
1Contents
1Contents ...................................................................................................3
2Safety and the environment....................................................................4
2.1. About this document........................................................................4
2.2. Ensure safety...................................................................................5
2.3. Protecting the environment..............................................................6
3Specifications ..........................................................................................6
4Technical data..........................................................................................6
5Product description.................................................................................9
5.1. Overview..........................................................................................9
6First steps ..............................................................................................11
7Using the product ..................................................................................13
7.1. Switching Bluetooth® on and off....................................................13
7.2. Settings for the measurement........................................................14
7.2.1. Damping (Gliding Average)............................................................................ 14
7.2.2. Hood Calibration ............................................................................................14
7.2.3. Zeroing Interval (Automatic Zeroing)..............................................................14
7.3. Measuring......................................................................................14
7.3.1. Pitot tube measurement.................................................................................14
7.3.2. Differential pressure measurement ................................................................15
7.4. Saving ...........................................................................................15
7.5. Transferring measurement data to the PC ....................................16
8Maintaining the product ........................................................................17
8.1. Cleaning the instrument.................................................................17
9Tips and assistance...............................................................................17
9.1. Questions and answers .................................................................17
9.2. Accessories and spare parts .........................................................18
10 Authorizations........................................................................................19
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2 Safety and the environment
4
2Safety and the environment
2.1. About this document
Use
> Please read this documentation through carefully and
familiarize yourself with the product before putting it to use. Pay
particular attention to the safety instructions and warning advice
in order to prevent injuries and damage to the products.
> Keep this document to hand so that you can refer to it when
necessary.
> Hand this documentation on to any subsequent users of the
product.
Symbols and writing standards
Representation Explanation
Warning advice, risk level according to the
signal word:
Warning! Serious physical injury may occur.
Caution! Slight physical injury or damage to
the equipment may occur.
> Implement the specified precautionary
measures.
Note: Basic or further information.
1....
2....
Action: more steps, the sequence must be
followed.
> ... Action: a step or an optional step.
- ... Result of an action.
Menu Elements of the instrument, the instrument
display or the program interface.
[OK] Control keys of the instrument or buttons of
the program interface.
... | ... Functions/paths within a menu.
“...” Example entries
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2 Safety and the environment
5
2.2. Ensure safety
> Do not operate the instrument if there are signs of damage at
the housing, mains unit or feed lines.
> Do not perform contact measurements on non-insulated, live
parts.
> Do not store the product together with solvents. Do not use any
desiccants.
> Carry out only the maintenance and repair work on this
instrument that is described in the documentation. Follow the
prescribed steps exactly. Use only original spare parts
from Testo.
> Dangers may also arise from the systems being measured or
the measuring environment: Note the safety regulations valid in
your area when performing the measurements.
Testo guarantees the functionality of its products when used in
accordance with their intended purpose. This guarantee does not apply
to features of Testo products in combination with unauthorised third-
party products. Competitor products are not authorised by Testo.
As is common practice, Testo generally excludes support, warranty or
guarantee claims relating to functionality that has not been guaranteed
by Testo as part of the product offered. Claims shall also be excluded
in the event of improper use or handling of the products, e.g. in
combination with unauthorised third-party products.
For products with Bluetooth®
Changes or modifications that have been made without the explicit
consent of the responsible approval authority, may cause the
retraction of the type approval.
Data transfer may be disturbed by equipment that uses the same
ISM-band, e.g. WLAN, microwave ovens, ZigBee.
The use of radio communication links is not permitted in aeroplanes
and hospitals, among others. For this reason the following points
must be ensured before entering:
> Switch off the instrument.
> Disconnect control unit from all external power sources (mains
cable, external rech. batts., ...).
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4 Technical data
6
2.3. Protecting the environment
> Dispose of faulty rechargeable batteries/spent batteries in
accordance with the valid legal specifications.
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
regulations)
3Specifications
The testo 420 is used for volume flow measurements (main
application), Pitot tube measurements and pressure measurements
for air conditioning and ventilation systems. Thanks to its
interchangeable flow hoods, the testo 420 can be used for air inlets
and outlets of various sizes.
With the additional App (Android/iOS), the readings can be
conveniently displayed on a tablet or smartphone, and in addition a
measurement can be started, stopped and saved via the App.
4Technical data
The use of the wireless module is subject to the regulations and
stipulations of the respective country of use, and the module may only
be used in countries for which a country certification has been granted.
The user and every owner has the obligation to adhere to these
regulations and prerequisites for use, and acknowledges that the re-
sale, export, import etc. in particular in countries without wireless
permits, is his responsibility.
Feature Values
Measurement
parameters
Flow velocity : m/s / ft/min
Volume flow: m³/h / cfm / l/s
Pressure (absolute pressure): hPa / mbar / kPa
Pressure (differential pressure): Pa / hPa /
mbar / mmH2O / inH2O
Measuring cycle 1/sec
Interfaces Probe interface Mini DIN (testo 420 Set)
Micro USB
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4 Technical data
7
Feature Values
Measuring ranges Flow velocity: 0 to 14 m/s /
0 to 2750 ft/min
Pressure (absolute pressure):
700 to 1100 hPa
Pressure (differential pressure): -
120 to +120 Pa
Resolution Flow velocity: 0.01 m/s
Volume flow: 1 m³/h / 1 cfm
Pressure (absolute pressure): 0.1 hPa /
0.1 mbar / 0.01 kPa
Pressure (differential pressure): 0.001 Pa /
0.00001 hPa / 0.00001 mbar / 0.0001 mm
H2O / 0.000001 inH2O
Accuracy
(nominal temperatur
e 22°C/71.6°F)
Flow velocity and Volume flow: no accuracy
specification since calculated variable
Error absolute pressure compensation:
±0.04% of m.v. / hPa deviating from 1013 hPa
Pressure (absolute pressure): ± 3 hPa
Pressure (differential pressure): ±2% of m.v.
+ 0.5 Pa (at 22°C, 1013 hPa)
Error absolute pressure compensation:
±0.04% of m.v. / hPa deviating from 1013 hPa
Temperature
coefficient
Pressure (absolute pressure): ± 0.02% of
m.v. / K (deviating from 22 °C, in the range
0 to 60 °C)
Pressure (differential pressure): ± 0.02% of
m.v. / K (deviating from 22 °C, in the range
0 to 60 °C)
Response time t90 Flow velocity: approx. 1 s
Volume flow: approx. 1 s
Pressure (absolute pressure): approx. 1 s
Pressure (differential pressure): approx. 1 s
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4 Technical data
8
Feature Values
Operating and
ambient conditions
Storage temperature: -20 to +60 °C / -4 to
140 °F
Operating temperature: -5 to +50 °C/+23 -
+122°F
Humidity: 0 to 100% RH
Pressure range: 800 to 1100 hPa
Housing /
measurement setup
Measuring instrument housing material: ABS
Measuring instrument dimensions:
150x85x35 mm
Power supply 4 x 1.5 V rechargeable/non-rechargeable
batteries
Type AA / alkaline manganese, mignon
Battery lifetime: approx. 40h (eroing interval
10 seconds, display illumination off,
Bluetooth off)
Display Type: Dot matrix
Dimensions: 3.5 inches
Directives,
standards and tests
EU guideline: 2014/30/EU
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5 Product description
9
5Product description
5.1. Overview
Overview of testo 420
1 Battery compartment, on rear of the instrument
2 Display
3 Control keys
4 Probe socket Mini-DIN (only for use on the measurement base)
5 Micro-USB port
6 Connection for pressure measurement
Instrument status icons:
Icon Meaning
Battery capacity
Bluetooth
/ / Measuring mode:
Pressure measurement, Pitot tube, volume
flow (air pressure from above into the hood /
suction outlet)
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5 Product description
10
Icon Meaning
Actual Actual volume flow:
The current ambient conditions are used to
calculate the volume flow. The actual
barometric pressure is measured with the
internal sensor. In applications with volume
flow hood, the temperature is measured by
the integrated temperature/humidity sensor,
with Pitot tube measurement the actual
temperature needs to be input manually.
Standard Standard volumetric flow:
The standard settings for temperature and
barometric pressure (21 °C / 1013 hPa in
accordance with the standard conditions of
the NIST, National Institute of Standards and
Technology) are used to calculate the volume
flow.
K-factor Factor by which the current reading is
multiplied. Depends on which outlet
measurements are being taken at.
Pitot Tube factor
(P-factor)
The Pitot tube factor for Pitot tubes is
generally the same and must be entered:
• Pitot tubes from Testo: 1.00
• Pitot tubes from other manufacturers: the
Pitot tube factor can be found in the
instruction manual or you should ask your
supplier.
Control keys
Key Function
Menu
[►, ■]Holds / starts / stops a measurement
[ESC] Switches to the previous view / to the
measurement view
Saves the measured values
[►, ▲, ▼,◄]Navigation within the menu
[] Confirms a selection
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6 First steps
11
Key Function
Switch instrument on/off (press and hold
down)
Switch illumination on/off (press briefly)
6First steps
Inserting batteries/rechargeable batteries
1. Open the battery compartment.
2. Insert the batteries or rechargeable batteries (scope of delivery
includes 4x 1.5V Type AA/ LR6).
3. Close the battery compartment.
When not in use for a long period of time, take the
batteries/rechargeable batteries out.
Implementing settings
1. Press to access the menu.
2. Select the menu item you require using ►, ▲, ▼, ◄.
Key functions
Display Explanation
►, ▲, ▼,◄Change parameter, select unit
Confirm input
1. Menu Level 2. Menu Level 3. Menu Level
Application Flow Hood K-factor
Actual/Standard
Pitot tube Duct
Pitot tube factor
Pitot Temperature
Actual/Standard
Pressure only --
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