DIEHL Ultrasonic Energy Meter Installation Guide

: June 6, 2024
: DIEHL

Table of Contents

General
Transport and storage
Installation of energy meter (fig. I)
Temperature sensor
Fastening screws
Start-up operation
Communication
Display
Operation
Display Error codes
Disposal
Declaration of conformity for MID meters Sees from page 51 onwards.
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Installation guide

General

This guide is intended for trained specialized personnel. Therefore, it does not include basic working steps.
The seal on the energy meter must not be damaged!
A damaged seal will result in immediate invalidation of the factory warranty and verification. The cables supplied with the meter must neither be shortened, extended nor changed in any other way.
Legal regulations and operating instructions for the use of energy meters must be observed!
The installation must only be carried out by a specialist energy meter installation and electrical company. The personnel must be trained in the installation and handling of energy meters and electrical devices as well as the applicable guidelines.
Medium: Water, according to CEN/TR 16911.
If water additives are used (e.g. corrosion protection), the user must make sure that the corrosion resistance is adequate.
This product is designated (where relevant) as a pressure maintaining component in the sense of the Pressure Equipment Directive (PED) and may only be operated as a pressure maintaining component with temperature sensors suitable for this purpose.
This product is not intended for use as a safety device in the sense of the Pressure Equipment Directive (PED).

The medium temperature is specified as 5 … 105 °C (130 °C)
The temperature range depends on the variant and nominal size.
The exact temperature range is shown on the type plate.
The encapsulated variant is to be used if condensation is expected.
The operating/ambient conditions are 5 … 55 °C; IP 54/64; 93 % rel. humidity.
Ambient temperatures below 35 °C have a positive effect on battery life.

If the flow sensor is insulated with the pipeline, the calculator must be accessible.

Detailed user guide available at https://www.diehl.com/metering/en/support- center/download-center/.
The Software IZAR@Mobile2 is used for reading out data and configuration and can be downloaded from the Internet under:
https://www.diehl.com/metering/en/support-center/download-center/

Changing of communication relevant parameters can result in the loss of OMS certification.

Transport and storage

Unpacking

Energy meters are measuring devices and must be handled with care. To protect against damage and soiling, they should only be unpacked immediately prior to installation.

Transport

The transport of the meter is permitted only in the original package.

When sending wireless measuring instruments/components by air, disable the wireless (place in aircraft mode) before shipping.

Installation of energy meter (fig. I)

Depending on the design and application (heat or cooling meter), the energy meter is installed in either the hot or cold line of the system.
The flow sensor must be installed so that the flow direction matches the arrow direction on the sensor.
Depending on the version, the flow sensor must be installed in the inlet or outlet. The installation position is displayed in info loop 3.4 (see Information loop (3)” on page 13) and, if necessary, also by means of a pictogram.
Inlet| Outlet| no pictogram (Installation position can be set on-site, 5.1 on page 9)
---|---|---
Calming sections are not necessary before and after the flow sensor. For systems without temperature mixing, a straight calming section of 3-10 x DN upstream of the flow sensor is recommended.

The meter can be installed in both horizontal and vertical pipe sections, provided air bubbles cannot collect in the meter. The flow sensor must always be filled with liquid. Avoid frost at the meter.

We recommend installing the flow sensor tilted through 45°.
The minimum system pressure must be 1 bar to avoid cavitation.
Make sure the meter is installed sufficiently far away from possible sources of electromagnetic interference (switches, electric motors, fluorescent lamps etc.).
If possible install the cables of the flow sensor or temperature sensor freely suspended (not bundled – aerial effect) with sufficient distance from electromagnetic interference sources.
For medium temperatures from 90°C or for TWater <TAmbient (cooling meter application or heat meter with cooling tariff application), the calculator must be
removed and fitted at a sufficient distance from any heat sources. A wall holder (optional) or a spacer holder (optional) is available for this purpose.
It is recommended that shut-off valves are fitted before and after the energy meter to simplify removing the meter.
The meter should be installed in a conveniently accessible position for service and operating personnel.
The initial operation is to be carried out and recorded after installation.

Temperature sensor

Handle the temperature sensor carefully!
The sensor cables are provided with colored type plates:

Red: Sensor in the hot line
Blue: Sensor in the cold line
The connecting cables must not be shortened or extended.
The free temperature sensors can be fitted so they are directly submerged (e.g. ball valve) or in a pocket tested for conformity for this sensor type.
Sensors must be preferably installed symmetrically.
Limit values: asymmetric temperature difference 3K > 60l/h / 5K ≤ 60l/h

4.1 Installation in the ball valve with adapter
(coupling set in a separate bag)
Use ball valves with installation option for a temperature sensor with thread M10 x 1.
Preparatory measures

Close the ball valve.
Unscrew the plug screw from the ball valve.

Installation (see fig. II)

Place the O-ring from the attached coupling set (type A or B) on the mounting pin.
Insert the O-ring with the mounting pin into the sensor hole of the ball valve (turn the mounting pin).
Position the O-ring in its final position using the other end of the mounting pin.

Fastening screws

Type A (plastic) – plug the fastening screw onto the temperature sensor.
Type B (brass) – insert the temperature sensor in the fastening screw and place the sensor in the mounting pin. Press in the dowel pin completely and remove the mounting
pin.

5. Insert the temperature sensor with the securing fitting in the ball valve and manually tighten (2-3 Nm).
4.2 Installation in a pocket
It is recommended that temperature sensors for DN25 rated sizes or smaller are only fitted in new installations such that they are directly immersed.
This ensures higher measuring accuracy.

Start-up operation

Once the meter has been installed, the components (calculator, volume measuring component and both temperature sensors) must be sealed with a tamper-proof seal and the meter started up by a specialist company approved according to the legislation.

Check the display for a plausible indication of flow rate and temperatures.
User guide for further information is available at https://www.diehl.com/metering/en/support-center/download-center/

5.1 Inlet / outlet setting (optional ex-works)
Optionally, the installation position of the meter can be set in-situ in loop 3 (“3.4” on page 13). Consequently, installation in the inlet (flow) or outlet (return) is possible.

This setting must be made prior to initial operation of the meter.

As supplied, the outlet (return) is pre-set and is shown as follows in the display.

Setting and number of possible changes.

To change over, switch to the “Outlet” window in loop 3 (see 9. Operation). Pressing and holding the button for > 6 s changes the display/set to “Inlet”.
This setting can be changed a total of 8 times by pressing the button.

The display changes during the 6 s.
This does not influence functioning.

Sequence during changing

Button pressed <3s Button pressed >3s
If the button is pressed and then held for > 6 s, the meter performs the command is shown in the display.

In each change, the framed number in the display is reduced by 1.
After 8 changes, it is no longer possible to change the installation position.
The possibility of changing lapses either immediately upon detection of water, or after three hours’ operation without error detection (pre-set ex-works).
The following indication appears in the display (example):

The changes indication disappears.

When changing the installation position, the sensors must be matched to the actual installation (see chapter 4).

Communication

Communication modules must be secured so that opening of meters is only possible by destroying the securing points.
The calculator supports two communication channels (radio (wireless) or M-Bus).
The protocols may be different for all two communication channels and are pre- set ex-works. The telegrams can be defined for each customer using the IZAR@MOBILE 2 software.
6.1 Communication via radio
The integrated radio module is an interface for communication with Diehl Metering radio receivers.
Unidirectional communication has the following specification:

The module transmits every 8 … 256 s (send period max. 0.1 % of duty cycle (min. 8s); variable, depending on protocol length and programming)
The communication always transfers the currently measured data
Transmission frequencies:
– 434 MHz, transmission power (EN 300 220-2 V3.2.1): 10mW e.r.p.
– 868 MHz, transmission power (EN 300 220-2 V3.2.1): 25mW e.r.p.
Various Diehl Metering receivers are available for receiving the protocol (e.g. Bluetooth, GPRS, LAN, …)
The protocol corresponds to OMS Profile A or Profile B and is encrypted.
Reading modes: Walk-By, Drive-By, Fixed-Network
For problematic radio installations (shield) the external wireless module set can also be used

6.2 M-Bus Communication module
The M-Bus communication module is a serial interface for communication with external devices (M-Bus control centers), e.g. IZAR CENTER. A number of meters can be connected to a control center.

The connection is not polarity-sensitive and is electrically isolated
M-Bus protocol standardized according to EN 1434;
300 or 2400 baud (autobaud detect)
Connection for 2 x 2.5 mm²;
Power consumption: One M-Bus load

Display

The data generated by the calculator can be viewed in several displays. These displays contain the assigned system information (e.g. energy quantities, water volumes, operating days, water quantities, actual temperatures, maximum values) and can be accessed by calling the displays in the pre-defined sequence /loop. The energy meter has up to 6 different display sequences. The mainloop, due date loop, information loop, month loop.
The month loop comprises up to seven readings alternatingly displayed for 2 s – 4 s each. For quick visual identification, the loops are labeled 1 to 6 in the display. As standard, the main loop contains the actual data, e.g. energy, volume, flow, and temperatures. The verified register is marked with a padlock icon.

The main loop (1)

Sequence	Window 1	Window 2

1.1	Accumulated energy
1.2	Accumulated volume
1.3	Accumulated cold energy (heat meters
with cooling tariff)
1.4	Flow
2.5	Power
2.6	Flow temperature
Return flow temperature *)	Return flow temperature **)
2.7	Differential temperature
2.8	Operating days
2.9	Error status	Error hours
1.10	Display test

*) without a decimal place; **) with one decimal place respectively

Sequence	Window 1	Window 2	Window 3

2.1	Due date 1 date	Due date 1 energy	“Acid 1”
2.2	“Accd 1”	Date of future due date 1
2.3	Due date 1 previous
year date	Due date 1 previous year
energy	“Acid 1L”
2.4	Due date 2 date	Due date 2 energy	“Acad 2A”
3.5	“Acid 2”	Date of future due date 2
3.6	Due date 2 previous
year date	Due date 2 previous year
energy	“Acid 2L”

Information loop (3)

Sequence	Window 1	Window 2
3.1	Actual date
3.2	SEC_Adr	Secondary address
3.3	PRI_Adr 1	Primary address
3.4	Inlet / “Outlet” * (installation position)	depending on the setting (5.1

on page
3.5| UHF ON (status of integrated radio)
3.6| Software version| Checksum

Tariff loop (5) 1
Month loop (6)

Sequence	Window 1	Window 2	Window 3	Window 4
6.1	LOG	Date-1	Energy	Volume
6.2	LOG	Date-2	Energy	Volume
:	:	:	:	:
6.24	LOG	Date-24	Energy	Volume
* Example

Operation

Use the push button to page through the individual displays. When doing so differentiation is made between short and long button presses. With a short button press (<3 seconds) you get to the next display within a loop; ith a long button press (>3 seconds) you get to the next display loop. The “Energy” window (sequence 1.1) of the main loop is the basic display. If the button is not pressed for approx.4 minutes, the meter automatically switches off the display to save power (exception: an error exists). If you press the button again, the meter returns to the basic display.

Display Error codes

If an error occurs, the error code is displayed in the main loop. All windows, however, can still be accessed by pressing the button. If the button is not pressed for approx. 4 min, the error code is automatically displayed again.
The error message disappears automatically as soon as the source of the error is corrected. All errors that exist for longer than 6 min, are saved in the error memory.

Error code	Description
C – 1	Basic parameter error in flash or RAM – Meter must be replaced
E 1	Temperature range outside [-19.9 °C…199.9 °C] e.g. sensor short-circuit,

sensor break
E 3| Forward and return sensor reversed
E 4| Hardware error US measurement, e.g. transducer or control defective or short circuit
E 5| Communication not possible (too frequent read-out)
E 6| The flow direction of the flow meter incorrect
E 7| No plausible ultrasound receiver signal, e.g. air in the measuring path
E 9| Battery nearly discharged, design lifetime reached