PKP DB04A User manual

Instruction Manual
DB04A
Thermal Mass Flowmeter for Gases
without auxiliary Power
PKP Prozessmesstechnik GmbH
Borsigstraße 24
D-65205 Wiesbaden- ordenstadt
Tel.: ++49-(0)6122-7055-0
Fax: ++49-(0)6122-7055-50
Email: [email protected]

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DB04A EN A1-9 PKP Prozessmesstechni 02
Version : DB04A EN A1-9
For the latest information on our products, see our website at www.pkp.de
PKP Prozessmesstechnik GmbH, Borsigstraße 24, D-65205 Wiesbaden-Nordenstadt
Operating instructions
DB04A

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DB04A EN A1-9 PKP Prozessmesstechni 03
Copyright and Liability Disclaimer
All rights reserved. No part of this publication may be reproduced in any form or by any means
without the publisher's prior written permission.
The content of this manual is provided for information only and may be altered without prior notice.
PKP Prozessmesstechnik assumes no responsibility or liability for any errors or inaccuracies in
this manual.
This symbol alerts the user to important operating, maintenance and service
information.
Important instructions
•
Do not remove the electronics housing. A damaged hologram seal will void the warranty.
•
There are no serviceable parts inside the unit.
•
Repairs must only be performed by qualified personnel
Attention
This unit has several power supply possibilities. If you use the e ternal 24 Vdc power supply, it is
strongly recommended to have this device grounded.
Subject to change
Due to our policy of ongoing product development, we reserve the right to change the information
in this manual without notice.
Recycling
Note the e isting regulations of your country.
Toxic, flammable gases and ATEX
In the case of to ic and flammable gases, the respective safety guidelines in each country must be
followed. This DB04A device is NOT E certified. In the case of flammable and to ic gases, fittings,
cable glands and pipes intended for that purpose must be used. The responsibility for safe
operation lies with the user and designer of the facilities.

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DB04A EN A1-9 PKP Prozessmesstechni 04
Oxygen service
PKP is not liable for any damage or personal injury, whatsoever, resulting from the use of our
standard mass flow meters or controllers for o ygen gas. You are responsible for determining if
this mass flow meter or controller is appropriate for your o ygen application. You are responsible
for cleaning the mass flow meter or controller to the degree required for your o ygen flow
application.
Trademar
DB04A is a Trademark of PKP. Other product and company names listed in this manual are
trademarks or trade names of their respective manufacturers.
Receipt of your instrument
When receiving the instrument, carefully check the outside packing carton for damage that may
have incurred during shipment. If the carton is damaged, notify the local carrier and submit a report
to the factory or distributor. Remove the packing slip and check that all ordered components are
present and match your specifications (as ordered). Make sure any spare parts or accessories are
not discarded with the packing material. Do not return any equipment to the factory without first
contacting PKP:
E-mail Customer Service:
[email protected]
Installation
Please note before the start-up:
•
Do not use sealing tape or liquid sealant
•
Piping must be cleaned before installation of instrument.
Products in this manual may contain metal or elastomer seals, gaskets, o-rings or valve seats. It is
the “user’s” responsibility to select materials that are compatible with their process and process
conditions. Using materials that are not compatible with the process limitations of the device, may
result in equipment damage and/or personnel injury or death.
It is recommended that the user check the devices on a regular schedule to ensure that it is leak
free as both metal and elastomer seals, gaskets, o-rings and valve seats may change with age and
e posure to process gas.
Power
If it becomes necessary to remove the instrument from the system or change a battery, the power
to the device must be disconnected. Always switch off the power before you disconnect terminal
connections in potentially dangerous surroundings to avoid sparks.

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Table of contents
1. Introduction 7
1.10. Features of DB04A thermal mass flow meters 7
1.11. Scope of warranty 7
1.12. Instructions and warnings 8
1.13. Documentation and cables supplied 8
1.14. The measurement principle 8
1.15. Real, Standardized and Normalized flow 9
1.16. CMOS technology 10
1.17. Block diagram 11
2. General device specifications 12
2.10. Safety 13
2.11. Electrical data 13
2.12. Measurement ranges (air) 13
2.13. USB interface 14
2.14. Battery 14
2.15. Optional Modules 14
2.16. Calibration 15
2.17. Operation with other gases 16
2.18. Pressure loss 16
2.19. Temperature compensation 16
2.20. Pressure compensation 16
2.21. Response time 16
2.22. Filter settings 16
3. Installation and commissioning 17
3.10. Scope of delivery 17
3.11. Mounting position and mounting location 17
3.12. Requirements for pipework 17
3.13. Fittings and filters 18
3.14. Filters / Gas cleanliness 18
3.15. Electrical power supply 19
3.16. How to replace the battery? 20
3.17. Warm-up time 21
4. Operation 21
4.10. Introduction 21
4.11. Main Menu 24
4.12. Settings 31

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5. Maintenance 35
5.10. Cleaning to remove contamination 35
5.11. Returns 36
6. Appendix 37
6.10. Troubleshooting 37
6.11. Pressure loss 39
6.12. Dimensional drawings ¼” in mm 41
6.13. Dimensional drawings ¼” in inches 42
6.14. Dimensional drawings ½” in mm 43
6.15. Dimensional drawings ½” in inches 44
6.16. Wetted parts DB04A series 45
6.17. Contamination statement 46
6.18. Overview Default settings 47

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1. Introduction
Thank you for choosing devices from the DB04A series. These operating instructions will help you
to install and operate the measuring devices. Please read through these instructions carefully
before installing the devices. Our aim has been to write a full and practical guide. We would be
grateful if you would notify us of any shortcomings or mistakes.
Please contact PKP if you have questions about any aspect of the products.
The DB04A is a thermal based mass flow meter that can measure the mass flow of gases. The
core element of the DB04A thermal mass flow meter is a CMOS sensor chip. The sensor and parts
of the electronics are on one board and offer a number of advantages for the user.
1.10. Features of DB04A thermal mass flow meters
In developing and manufacturing the devices, we have focused primarily on customers and their
applications. Our aim is to implement customers' requirements in the form of new developments or
enhancements on an ongoing basis. The essential features are:
Compact design
Battery operated optional (Portable)
Dot-matri LCD touch screen
Multiple gases possible (3 gases)
Fle ible due to the many different settings accessible through the touch screen
Back-light screen in USB and 12-30 Vdc power mode
Power also possible with USB micro-B connector or e ternal 12-30 Vdc (Separate module)
Optional alarm module with power, 3 contacts and 2 inputs
Display can be rotated 180 degrees
Fast and accurate measurement and control
Integrated temperature compensation and flow totalizer (standard)
Easy to maintain and service
Firmware upgradable through USB connection
3-year warranty
1.11. Scope of warranty
Warranty for the DB04A product line e tends to material and manufacturing defects only.
Ma imum warranty covers product replacement free of charge. The following causes of
faults/damage are not covered under warranty:
Use outside the operating limits
Damage due to corrosion
Damage due to leaking batteries
Mechanical damage in general
Contamination due to improper sealing
Contamination due to impure gases or penetration of liquids
Damage to electronic components due by over-voltage or electrostatic discharges, and
corrosion damage due to aggressive environments.
Functional failure due to incorrect operation or faulty parameterization
If the unit has been opened or otherwise tempered with.
Drift in the calibration

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1.12. Instructions and warnings
Read all of the operating instructions thoroughly before installing and commissioning equipment.
Misconceptions and incorrect use can lead to breakage of the measuring device or risk of personal
injury.
The installation, commissioning and operation and maintenance must be done by appropriately
qualified personnel.
1.13. Documentation and cables supplied
Every unit comes with a USB A to USB Micro-B cable. This cable can be used to power the unit
and to upgrade the firmware.
1.14. The measurement principle
The thermal mass flow measurement principle is particularly suitable for the measurement and
control of clean and dry gaseous media. The most significant advantage is that the measurement
process measures the real mass flow and is largely independent of temperature and pressure.
Stated simply, the thermal measurement principle measures the heat transport by gas flowing past.
In the case of DB04A mass flow measuring instruments, a constant heat input gives a flow-
dependent temperature difference (∆T). Two temperature sensors are positioned in the measuring
channel (T1, T2), one before the heating system (H) and one after it.
If there is no flow, the heat spreads symmetrically in directions T1 and T2. The temperature
difference T1-T2 is therefore zero.
Flow rates > 0 create a temperature difference.
The sensor T1 at the inlet is cooled by the gas flowing past it, and the temperature of the second
sensor T2 rises due to the heat drawn from the heating system.
The temperature difference is related non-lineary to the mass flow, with very high repeatability. The
electronics will, based on the calibration, convert this temperature difference in a linear and
proportional indication of the mass flow of the gas.
Figure 1: Measurement principle Figure 2: Sensor operation

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1.15. Real, Standardized and Normalized flow
The user-selectable engineering units of the DB04A has been divided in two groups: “Real and
Normal” units and “Other units”
This separation is not only there to find the unit you want to select quicker, it also separated the
“Normalized flow” from the “Standardized flow”
Figure 3: Units menu
The DB04A has basically 2 reference conditions: One for “Real and Normal” units and one for
“Other units”
The factory setting is as follows:
1) For all units that are used in "normal" (like ln/min), the reference conditions are always 0°C
and 1013.25 mbara. This cannot be adapted.
2) For all the other units that are “standard” (like ls/min and sccm) and the l/min the reference
conditions has to be be defined when the unit is ordered.
The reference value for all units that are not “Normal” or “Real” it has to be defined with the
purchase order. It cannot be changed after the units has been delivered.
On the sticker of the DB04A we will mention a reference condition. This reference condition is for
the “Standard” units only. The “normal” units will always be 0°C and 1013.25 mbara.
In future version of the firmware the reference conditions will be adjustable in the menu.

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Gas flow in general can be e pressed in one of the following:
•
Volumetric flow: (f.i. l/min). This theoretically cannot be measured by the DB04A because it
is volume. The DB04A measures mass flow. However, due to regional requirements we
still have it as a flow unit that is selectable. Units shown as volume (l/min) refer to the
customer defined reference conditions (Same as “standard”)
•
Real Mass flow: (f.i. Kg/hr). This refers to true mass units per time unit. The DB04A can
measure this and you can select this type of unit from the menu.
•
Normalized volumetric flow: Normalized means that the units are “translated” to predefined
pressure and temperature conditions. Normalized or Normal Conditions refers to 0°C and
1013.25 mbar absolute. You can select this type of unit from the menu of the DB04A.
These units are mostly used in Europe and China.
•
Standardized volumetric flow: Standardized means that the units are “translated” to
predefined pressure and temperature conditions. Standardized or Standard conditions
refers to 20°C (68°F) and 1013.25 mbar (=760 mmHg) absolute. You can select these type
of units from the menu of the DB04A. These units are mostly used in the USA.
Standardized can also refer to other reference conditions (f.i. Natural Gas industry often
uses 15°C and 1013.25 mbar absolute. In the semicon world they often use 25°C and
1013.25 mbara. Please define and mention these reference condition at the time of your
order.
Please note that reference condition relating to Normalized or Standardized volumetric flow are
NOT the operating conditions. According to the ideal gas law, the gas volume will change by
0.35% per K.
Please note that PKP standard uses the following densities for their main 3 gasses:
Air: 1.293 gr/m3, N2: 1.2504 gr/m3, O2: 1.429 gr/m3 (All at 0°C and 1013.25 mbar absolute). If you
use other densities or need additional information for other gasses, please contact the factory.
Densities need to be defined before manufacturing and cannot be adjusted once the unit has been
delivered.
1.16. CMOS technology
The DB04A measuring and control devices are equipped with an innovative CMOS semiconductor
sensor that sets new standards for accuracy, speed and measurement dynamics.
With our CMOS technology the sensor element, amplifier and A/D converter form a single silicon
chip.

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1.17. Bloc diagram
The following GCM block diagram shows the structure of the device. The block diagram does not
show the optional manual control/needle valve (Model GCR) that would normally be placed on the
outlet of the unit.
Figure 4: Block diagram

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2. General device specifications
Media (real gas calibration): Air, O2*, N2*, He, Ar, CO2, H2, CH4, C3H8
(other gases and gas mi tures on request)
*O2 & N2 are calibrated with air.
Accuracy:
Standard: ±2.0% of full scale; Ranges > 200 ln/min ±3.0% of full scale
Option G: ±1.0% of full scale (only G¼” instruments and real gas calibrations)
Dynamics:
Standard: 1:50 (Meter reads zero if flow is less than 1.7% of full scale)
Option G: 1:100 (Meter reads zero if flow is less than 0.83% of full scale)
Response time: Ma imum 300 msec (filter setting dependend)
Flow update by sensor 40 ms (Battery mode 500 ms)
Display update 240 ms (Battery mode 500 ms)
Repeatability: ±0.5% of full scale
Long-term stability: < 1% of reading / year
Temperature coefficient: < 0.025% FS measuring range type per °C
< 0.012% FS measuring range type per 1°F
Pressure coefficient: < 0.2% / bar of reading (typical N2)
< 0.014% / psi of reading (typical N2)
Working pressure range: 0.2 - 11 bara (3-160 psia)
Test pressure: 16 bara (232 psia)
Storage conditions: -20 to 80°C (-4 to 176°F), 0-95% RH, non-condensing
Temperature range: 0 – 50°C (32 bis 122°F), 0-95%, RH, non-condensing
Do not e pose device to direct sun light.
Warm-up time: < 5 sec. for full accuracy
Materials
Electronics housing: ABS (Acrylnitril-Butadien-Styrol)
Body Material: Anodized aluminium or stainless steel 1.4404 (316L)
Sensor area: Silicon, glass, epo y
Seal material: FKM, optional EPDM (FDA compatable)
Wetted parts: See appendi (see chapter Wetted Parts List)
Integration
Display: Touch display 128 64 p
Backlighted only with e ternal power supply (Micro-USB or 24 Vdc)
Process connection: G¼" (BSPP* female) up to 60 ln/min,
G½" (BSPP* female) up to 450 ln/min
*British Standard Pipe Parallel
Inlet section: None required
Mounting orientation: Any position (consult manufacturer above 5 bara (72 Psia) if the
DB04A will be mounted vertical)
Connection cable: For e ternal power supply: 2 m with loose ends (fly leads)

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2.10. Safety
Test Pressure: 16 Bara (232 psia)
Leak rate: 1 10-6 mbar*l/s He
Protection class: IP-50
EMC EN 61326-1
2.11. Electrical data
Supply voltage: Power supply DB04A meter & regulator Standard AA battery or
USB micro-B power supply (DIN 62684)
Option: E ternal power 12...30 Vdc (required current power
supply 120 mA. We recommend a power supply with a minimum
current of 150 mA)
(Power supply hereafter refered to as the 24 Vdc power supply)
2.12. Measurement ranges (air)
The DB04A has 4 different flow elements. Each element has a defined ma imum operating flow
range that will be defined during calibration. The flow ranges selectable below are the ma imum
flow ranges for air/O2 and N2 only. For other gasses consult the factory.
These ranges are adjustable electronically during factory configuration to your desired full scale
range.
Measurement full scale (air) scale freely selectable
DB04A: from 50 mln/min to 600 mln/min
from 600 mln/min to 6000 mln/min
from 6 ln/min to 60 ln/min
from 60 ln/min to 450 ln/min

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2.13. USB interface
The unit has an female USB micro-B connection (DIN 62684) that can be used as an e ternal
power supply and to upgrade the firmware (USB micro-B is the same connector you find on most
Android and Windows portable phones, you can use the charger of your telephone to power the
DB04A). It is not possible to read data from the flow meter through the USB connection.
2.14. Battery
The battery operated DB04A can operate on any common AA battery. The lifetime is strongly
dependent on the usage and the quality of the battery. In general we can state that the battery
lasts for about 3-6 months under non-continuous use.
We recommend to use e ternal power (USB micro-B or 24 Vdc) if you application needs
continuous measurement like measuring totalized flow. To e tend the lifetime of the battery, the
back-light is disabled during battery operation, you cannot activate it. We strongly recommend to
use the “auto power off” in the menu for battery driven devices.
More information on the battery in chapter 3.15 Electrical power supply and 3.16 How to replace
the battery?.
Note: When we supply the unit, the “auto power off” will be set to 15 minutes
2.15. Optional Modules
As an additional option you can purchase a power supply or an alarm module. See our website or
contact your local distributor for additional information.
The power supply module, is provided with a voltage from 12 to 30 Vdc, will power the unit. The
unit comes with a 2 meter cable.

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The alarm module can in addition to the
above power module, provide 3 customer
individually settable alarms and 2 inputs. The
module is supplied with a 2 meter fly-lead
cable.
Each of the 3 alarm contacts can be
configured as high, low, window and totalizer
alarm. Once the alarm becomes active, the 3
potential free alarm contacts can be reset in
many different ways. Automatic, through the
touch screen or with one of the 2 input
signals. Other options like hysteresis settings
and delays are also available.
For detailed information see 4.11.2 Alarm
Menu in this manual.
Both the power and the alarm module are
mounted similar to the battery module (see
3.16 How to replace the battery). They
replace the battery module, so you cannot
use these modules in combination with
battery power.
Generic specifications optional alarm module
Power input:
Voltage supply range : 12 - 30 VDC (Power supply hereafter refered to as the 24 Vdc power
supply)
Ma . current : 300 mA
Protection input: Polyfuse (trip current > 500mA) and reverse polarity protected
Switch ratings switch 1 + 2 (SPST hard contact):
Ma imum current 0.5 A
Ma imum voltage 30 Vdc
Switch ratings switch 3 (DPST contact):
Ma imum current 1 A
Ma imum voltage 30 Vdc
Inputs 1 + 2 (Opto-couplers):
Voltage range (polarity sensitive): 5 – 30 Vdc (@ 5mA ma )
Min. recommended pulse width 100 msec (Sample interval: 20 msec)
2.16. Calibration
Each measuring device is supplied with a factory calibration report. The calibration is traceable to
American and/or European standards. On request we can also provide DAkkS calibration (German
Accreditation Body).
Figure 5: Power and Alarm module wiring

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2.17. Operation with other gases
Each measuring device can store data for up to 3 types of gas or operational states that need to be
defined at the time of purchase.
CMOS gas flow sensors are not linear (The output is linearized) and respond different to each gas.
If the gas or gas composition is different than the gas that the unit was calibrated for, the unit will
not measure accurately. It is possible to program up to 3 different gases and gas mi tures, but this
needs to be done at the factory. Please contact PKP for additional information.
Note:
Please note that, among other effects, the zero-point error (offset display) will be higher if the
device is not operated with the type of gas, for which it had been calibrated. A difference in zero
indication is also possible if the used pressure is different than specified.
2.18. Pressure loss
Our thermal mass flow meters have a low pressure drop. The pressure drop depends mainly on
the medium, the pressure conditions and the flow rate. In chapter 6.11 Pressure Loss you find the
pressure drop for the most common gases. PKP has a calculation program for the other gases.
Please note that the size of the pipes has a large effect on the pressure loss. For e ample from
around 60 ln/min, we recommend a pipe inside diameter of at least 10 mm.
Please also note that some fittings have a reduced diameter and can cause considerable pressure
drop in your system. Be especially careful with vacuum applications, please select a relative big
pipe diameter).
2.19. Temperature compensation
The DB04A thermal mass flow meters measure the mass flow of gases, the result being largely
independent of pressure and temperature. In addition to the fundamental principle an internal
sensor measures the gas temperature and, with the help of a 3-dimensional table of interpolation
values, a correction factor is calculated automatically. The flow indication is thus temperature-
compensated.
2.20. Pressure compensation
During calibration, the specified operating pressure is taken into account. Changes to the pressure
conditions may introduce an additional error. This is around ±0.2% per bar.
Please note that the control behavior is influenced by substantially different pressure conditions.
(relevant for units with an intergrated needle valve only)
2.21. Response time
The response time is time required to display 98% of its final value after a sudden change in flow.
This response time for the DB04A 2 is around 300 ms but is dependent on your filter settings.
2.22. Filter settings
The filter settings smoothens the reading of pulsating or noisy flows. It can be set through the set-
up menu.

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Higher filter settings will slow down the response time of the unit.
(Please always first try to find and remove the cause of your noisy or pulsating flow e.g. add
volume to your system). More information on the filter settings in chapter 4.12.3 Filter
3. Installation and commissioning
3.10. Scope of delivery
We ship the device with the following accompanying documentation:
With each device, USB cable + 1 AA battery (if battery powered)
3.11. Mounting position and mounting location
Although the recommend mounting position is horizontal, the unit can used be upright, vertical or
upside down. With a vertical mounting position, dependent on the type of gas and at pressures
above 5 bara (72 psia, 500 kPa(abs)), a zero-point offset can be possible. This effect is caused by
convection in stationary media.
With regard to mounting location, the following situations can cause problems:
Strong heat sources, or ambient temperatures outside the specification
Strong sources of electromagnetic radiation such as spark discharges
Humid environments and the associated condensation lead to damage of the electronic
components
In general, aggressive environments reduce the service life.
Liquid running backwards can penetrate into the measuring instrument. An elevated
mounting location generally helps, or using check valves.
If your ambient air contains high humidity and at night the temperature goes down, it is
possible that you will get some condensation inside the unit. Please take precautions to
avoid this.
3.12. Requirements for pipewor
The most common causes of faults concern the way that devices are connected to the gas supply.
Please note the following points:
The pipes must be absolutely clean. Please flush them
before
installing the measuring
instruments!
Please ensure there are no pieces of thread sealant (f.i. Teflon tape) in the piping!
Use appropriate pipe materials (pressure rating, durability)
Even when connected to fi ed pipework, we recommend that the devices are mounted
using the appropriate mounting holes
From 50 ln/min, we recommend the following flow-calming sections of straight and
unobstructed straight tubing: Inlet: 10 diameter; outlet: 5 diameter
Use appropriate fittings (see chapter 3.13 Fittings and Filters).
Malfunctions can be caused by unstable pressure controllers, pumps that oscillate, and
volumes before and/or after the measuring device that are generally too small. Install an air
reservoir with 2 liter volume in the feed pipe (2 liter is an e ample, the volume depends on
the application).

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The size of the pipe must be matched to the measuring/control device. A diameter that is
too small results in an increased pressure drop.
Check for any leaks before commissioning the devices.
For maintenance work, we recommend that a bypass system is used. This is particularly
important where the gas supply must not be interrupted.
Sealants
The design of the devices enables sealing at the ends with O-rings or flat seals. It is essential that
you avoid:
the use of sealing tape to seal threads. Small pieces can cause incorrect measurements
and control-valve malfunctions. As well as that, if the device has to be checked or
recalibrated, there will be an e tra charge for the additional cleaning work.
sealing with liquid sealants will incur a higher cleaning charge for cleaning the device in an
ultrasonic tank.
3.13. Fittings and filters
We recommend fittings which are sealed with O-Rings. Than sealing agents or Teflon tape are not
necessary. Some compression fittings are available with an internal 50µ filter.
Please also consider that fittings and filters can create additional pressure drops over the flow
meter.
Please note that the length of the tread on you fitting that is screwed inside the body is for the G¼˝
no longer than 10mm (⅜”) and for the G½˝ no longer than 13mm (½˝) to avoid internal damage.
Installation
The fittings are normally supplied in pairs: they preferably should be installed with filter at the inlet
and without filter at the outlet. The fitting with a filter must be installed at the inlet (as determined by
the flow direction). The sealing rings (O-rings) must not be damaged during assembly.
3.14. Filters / Gas cleanliness
We always recommend that a filter, or at least a fine-mesh sieve (50 microns), is installed before
the measuring devices. It often happens that solid matter such as welding residues, metal or
plastic chips, rust, sealing tape, etc. affect the function.
In pressurized-air applications using compressors, the air must be dry and free of oil. Please
ensure that a suitable processing unit is located before the devices. In the case of gases from
cylinders, in general no filter is needed. For more information, see chapter 5. Maintenance.

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3.15. Electrical power supply
The DB04A can be provided with power from a standard AA battery or from a common USB micro-
B charger that you typically use for the changing of your phone. There are optional modules by
which you can apply a 12 to 30 Vdc e ternal power.
The lifetime of the battery strongly depends on the type and quality of the AA battery you use. We
recommend (and determine the specifications with) an Alkaline-Manganese Dio ide Battery with a
capacity of 3000 mAh (ANSI: 15A IEC: LR6)
Other types of batteries (for instance Zinc Carbon, Zinc Chlorine, NiCd, NiMH or Li-ion) can be
used, as long as the voltage is 1.2 to 1.8 Vdc. Using other batteries will influence the life of the
battery when used in the DB04A flow meter.
It is also possible to use rechargeable batteries, but the unit will however not charge the battery if
powered by the USB micro-B.
We strongly recommend to remove the battery from the case if you do not use the meter for longer
periods of time to avoid damage to the flow meter in case the battery starts to leak. The unit will
retain its settings so when you re-insert the battery the settings will be the same as when you took
it out. (The totalizer will be stored to the non-volatile memory once every 10 minutes, so the stored
value will never be older than 10 minutes)
There is no need to remove the battery if you connect the USB power supply. When you run the
unit on power from the USB micro-B and have a battery inserted, you can remove the USB
connector and the battery automatically takes over.
When the unit is powered by the battery you will not see the backlight to conserve energy. The
backlight is only operational when there is a power supply other than a battery.
When you replace or install a battery, all power to the unit should be disconnected.

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DB04A EN A1-9 PKP Prozessmesstechni 20
3.16. How to replace the battery?
When you replace or install a
battery, all power to the unit should
be disconnected.
The battery is in plastic compartment
mounted above the body and connected to
the main display/electronics housing. This
plastic part has 3 notches on each side. With
one hand hold the housing on the sides of
the display and with your other hand grab the
side where the plastic notches are located.
Pull the battery compartment from the main
housing. Replace the battery and push the
battery compartment back on the main
housing.
By pushing the battery compartment into
place you automatically connect the battery
to the electronics. It will take a few seconds
for the meter to start up.
You have to press the screen for about 3
seconds in order to switch the unit on.
Replacing the battery will not automatically
turn on the unit.
Inserting the battery incorrectly will not
damage the unit.
Please dispose of the
battery on an
environmental
friendly way
(Recycle)