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

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

English

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.

English

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

English

Sensors

Type of

sensor

Order no.

sensor

UMI-S1

UMI-M1

Order no.

hand-held

device +

sensor

6050-0840

6050-0841

Sensor cable

length

Nominal

diameter

DN 15 … DN 100

20 … 108 mm

DN 50 …DN 700

57 … 720 mm

Liquid

temperature

-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)

English

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

English

Cable 5 m (2 x)

1 Plug orange

2 Plug blue

Mains adaptor

English

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.

English

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.

English

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.

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