PCE Instruments UMI 840 User manual

UMI 840 Durchflussmessgerät | Ultrasonic Flow Meter
Bedienungsanleitung
User Manual
Letzte Änderung / last change: 6 September 2017
V 1.3
DE
EN

English
Contents
1Safety notes 21
2Specifications 22
2.1 Technical specifications 22
2.2 Delivery contents 23
2.3 Optional accessories 23
3System description 24
3.1 Device 24
3.2 Function keys 26
4Getting started 26
4.1 Internal battery 26
4.2 Power on 26
4.3 Menu windows 27
5Operation 28
5.1 Principle of measurement 28
5.2 Configuration of parameters 29
5.3 Sensors 31
5.4 Data logger 36
6Calibration 36
7Maintenance 36
7.1 Troubleshooting 36
8Warranty 39
9Disposal 39

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Thank you for purchasing an ultrasonic flow meter from Dostmann electronic.
1 Safety notes
Please read this manual carefully and completely before you use the device for the first time. The
device may only be used by qualified personnel and repaired by Dostmann electronic personnel.
Damage or injuries caused by non-observance of the manual are excluded from our liability and not
covered by our warranty.
The device must only be used within the approved temperature range:
Environmental humidity max. <80 % RH
Environmental temperature 0 ... +70 °C
Do not expose the device to extreme temperatures, direct sunlight, extreme humidity,
condensation or moisture.
Never use the instrument when your hands are wet.
Before taking a measurement, the device should be stabilised to the ambient temperature
(important when carrying the device from cold to warm rooms and vice versa).
Avoid strong shocks.
Do not use the meter around corrosive or explosive gases.
The case should only be opened by qualified Dostmann electronic personnel.
Repairs and maintenance work may only be carried out by qualified Dostmann electronic
personnel.
Never place the front side of the device on a workbench or work surface to avoid damage
to the operating elements.
You must not make any technical changes to the device.
Keep the flow meter clean and dry.
The appliance should only be cleaned with a damp cloth. Use only pH-neutral cleaner, no
abrasives or solvents.
Non-observance of the safety notes can cause damage to the device and injuries to the
user.
We do not assume liability for printing errors or any other mistakes in this manual.
We expressly point to our general guarantee terms which can be found in our general terms of
business.
If you have any questions please contact Dostmann electronic. The contact details can be found at
the end of this manual.

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2 Specifications
2.1 Technical specifications
Hand-held device
Model
UMI 840
Measurement range
-32 ... +32 m/s
Resolution
0.0001 m/s
Accuracy
for NPS ≥50 mm: ±1.5 % of reading
for NPS < 50 mm: ±3.5 % of reading
Repeatability
±1.0 % of reading
Media
All liquids with an impurity of <5 % and a flow of >0.03m³/h
Flow units
Cubic metre [m³]
Litre [l]
Gallon (USA) [gal]
Imperial Gallon (UK) [igl]
Million USA Gallons [mgl]
Cubic foot [cf]
Barrel (USA) [bal]
Imperial Barrel (UK) [ib]
Oil Barrel [ob]
The time can be per day [/d], per hour [/h], per minute [/m] and per
second [/s]
Data logger
1800 measuring data
Interface
USB (for online measurement and to read out internal memory)
Protection class
IP 52
Power supply
3 x rechargeable AA NiMH batteries / 2100 mAh (operating hours
12 h when fully charged)
100 …240 V AC 50/60 H
Dimensions
214 x 104 x 40 mm
Weight
450 g

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Sensors
Type of
sensor
S1
M1
Order no.
sensor
UMI-S1
UMI-M1
Order no.
hand-held
device +
sensor
6050-0840
6050-0841
Sensor cable
length
5m
5m
Nominal
diameter
DN 15 … DN 100
20 … 108 mm
DN 50 …DN 700
57 … 720 mm
Liquid
temperature
-30 … 160 °C
-30 … 160 °C
Dimensions
45 x 30 x 30 mm
60 x 45 x 45 mm
Weight
75 g
260 g
2.2 Delivery contents
1 x ultrasonic flow meter
2 x sensor (depending on model)
2 x 5 m connection cable
2 x releasable cable tie
1 x mains adaptor
1 x contact gel
1 x measuring tape
1 x carrying case
1 x user manual
1 x factory calibration certificate
2.3 Optional accessories
UMI-M1 Sensor type M1 (loose)

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3 System description
3.1 Device
Top view
Front view
Bottom view
1 Sensor connection (up)
2 Sensor connection (down)
3 Display
4 LED charging lamp
5 Membrane keypad
6 Charging socket
7 USB interface

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Cable 5 m (2 x)
1 Plug orange
2 Plug blue
Mains adaptor

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3.2 Function keys
The keypad consists of 18 keys. The keys from 0 to 9 and the decimal point are used to enter
numbers
Key
Name
Function
Up / + key
Press to select different window or enter numbers
Down / - key
Back key
Press to go one step back or move cursor left
ENTER key
Press to confirm or make a selection
MENU key
Press to enter menu mode or press followed by
two digits to enter a certain menu window
ON / OFF key
Press to switch ON / OFF
Reset key
Press to reset device to factory default settings
4 Getting started
4.1 Internal battery
The device can be powered either by the internal rechargeable battery (more than 12 hours with
continuous operation) or via the mains adaptor.
During charging, the LED glows red. It will turn green as soon as the battery is fully charged.
When the battery is fully charged, the voltage is approx. 4.25 V. The voltage is shown in window
M07. The battery is nearly flat when the voltage falls below 3 V. The device also indicates the
remaining battery life which is determined internally via the voltage. The indication of the remaining
battery life is just a rough guide value.
4.2 Power on
The device can be switched on via the ON key and switched off using the OFF key. After switching
on, the device runs a self-diagnostic programme. The hardware and the internal software are tested.
If an error is detected, this will be shown in the display.

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After the start-up, the device will show window M01. This is the most common window und shows
the positive totaliser, the volume flow, the flow velocity, the signal strength, the signal quality and the
operating status, based on the values last set for the pipe.
4.3 Menu windows
M00 … M09
Window for volume flow, velocity, date, time, totaliser, battery voltage,
remaining battery life, etc.
M10 … M29
Window for pipe parameters, etc.
M30 … M38
Window for unit selection and totaliser
M40 … M49
Window for response time, zero setting, calibration and PIN protection,
etc.
M50 … M53
Window for data logger
M60 … M78
Window for date / time setup, display of software version and serial
number, alarm, etc.
M82
Window for total operating time
M90 … M94
Diagnostic window for better accuracy
M97 … M99
Commands for saving pipe parameters, diagnostic information and display
indications
M+0 --- M+8
Window for additional functions, including a scientific calculator, overviews
of operating hours, ON / OFF times, …
The device has approx. 100 menu windows. These windows are numbered from M00, M01, M02,
M03…, through to M99.
There are two ways to select these windows:
(1) Directly, using the MENU key and the two digits
(2) Via the Up / Down keys; each keystroke changes to the next higher or previous window,
whereas the window M00 is at the top, which means that the Down key will lead you to the
next higher window.
The device has three different types of windows:
(1) Window to enter numbers, e. g. M11 to enter the pipe diameter
(2) Window to select options, e. g. M14 to select the pipe material
(3) Windows to view data, without being able to make a selection, e. g. M+1 to show the
complete operating time of the device
About (1): When you are in a window for data entry, you can enter the data and confirm with ENTER.
For example, if you are in window M11, you can directly enter
for the outer diameter of the pipe.
About (2): In a selection window, first press the ENTER key and then make a selection using the Up
and Down keys or the number keys if a number needs to be selected. Finally, confirm your selection
with the ENTER key.
Example M 14 (material selection):
Stainless steel, for instance, is assigned no. 1. To select a different material, press ENTER to be
able to make your selection using the Up and Down keys. Confirm your selection with ENTER. You
can also enter the numbers directly via the numeric keypad.

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5 Operation
5.1 Principle of measurement
The ultrasonic flow meter has been developed to measure the flow velocity of liquids in pipes. The
non-contact transducers / sensors are placed on the pipes and are thus not subject to any wear and
tear.
The UMI 840 works with two signal transducers (sensors) which serve as ultrasonic transmitters and
also as ultrasonic receivers. The sensors are installed on the outer wall of the pipe at a defined
distance, one below the other.
The sensors can be installed in Z shape (Z method). In this case, the ultrasound will pass through
the pipe once. If the sensors are installed in W shape (W method), the ultrasound will pass through
the pipe four times. When using the Z method, the sensors are placed opposite to each other. The
sound passes through the pipe or liquid diagonally. The selection of the right method depends on the
characteristics of the liquid.
1 Downstream transducer
2 Flow direction
3 Upstream transducer
4 Spacing
You can find more detailed information on how to place the sensors and how to select the right
method of measurement in chapter 5.3.Sensors.