Honeywell EW776 DATASHEET
Ultrasonic Hydronic Meters
FOR HEATING AND COOLING APPLICATIONS
0102
M 07
DE-06-MI004-PTB017
500
Hydrometer
O: 3.....177K
Environm. class: E1
Mechanical class: M1
Metrological class:
heatmeter
Inst. place: low temp.
Prod.year: 2007
5N: 3400
2
6446
qi: 0.015m
qp: 1.5m
qs: 3m
O: 5.....130
DN: 15 IP 54
T.sensor: Pt
O: 0.....180°C
3
∆
/h
3
/h
3
/h
°C
PN: 16
0
Typ: 773
7730000
EW7730K1200
Design
Hydronic meters of the EW773 Series consist of:
• Electronic energy integrator with cable connection to the
ultrasonic volume measuring component, supply and return
temperature probe
• Ultrasonic volume measuring component with external
threads according to ISO228 (DN15...DN25) or flanges
(DN25…DN80)
Materials
• Housing of electronic energy integrator made of black and
transparent plastic
• Housing of ultrasonic volume measuring component made of
brass
EW773 Series
PRODUCT DATA
Application
Static compact hydronic meter with electronic measurement
based on the ultrasonic principle, consisting of electronic
energy integrator, ultrasonic volume measuring component and
temperature sensors.
Metering of hydronic heating and / or cooling energy in hydronic
systems based on volume, supply and return temperature.
EW7730 models are suitable for energy metering of heating
systems.
EW7731 models are suitable for energy metering of cooling
and combined cooling and heating systems.
Features
• MID approval
• First approval in Europe for ultrasonic heat meter with
dynamic range of qi/qp m³/h 1:250 in class 2 (qp 1.5 /
2.5 / 6.0m³/h)
• Complete dynamic range ≥ 1:1,500
• 12 years battery lifetime
• Meters up to qp 6 with patented free-beam principle and
robust swirl-free flow around reflector made of stainless
steel
• Meters qp10 and larger with direct beam principle
• Standard housing dimensions
• Can be used for heating (EW7730), cooling or both
(EW7731)
• Available in nominal sizes from qp 0.6 up to 40m³/h
• Measuring accuracy meets the requirements of EN1434
class 2 and 3
• No calming leg required on inlet or outlet for sizes up to
qp 0.6m³/h
• Power save mode
• Remote reading via M-Bus, RF, RS232 or optical interface
• Optional plug and play modules
• Individual tariff functions
• History memory for 24 months
• Extensive diagnostic displays
• Windows based HYDRO-SET parametrization software
for optimum adaptation to the user's specific needs
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EW773 SERIES ULTRASONIC HYDRONIC METERS
Specifications
Medium Water, quality to VDI2035
Medium temperature see table below
Ambient temperature 0…55°C (32…131°F)
Operating pressure Threaded versions: PN16
Flanged versions: PN25
kvs (cv)-values see table below
Ambient class EN1434 class C / A
Protection class IP54 / IP64 (EW7731 volume measuring component only)
Type Static heat meter to EN1434
Measuring process Ultrasonic volume measurement
Display LCD, 7-digit
Units MWh – kWh – GJ – Gcal – MBtu
Total values 9 999 999 – 999 999.9 – 99 999.99 – 9 999.999
Values displayed Power – Energy – Flow rate – Temperature
Temperature sensors Pt500 with 2-wire leads
Sensor current Pt500 peak < 2; rms < 0.012mA
Measuring cycle Battery supply: 16s
Mains unit supply: 1s
Max. temperature difference 177K
Min. temperature difference 3K
Starting temperature difference 0.25K
Absolute temperature measuring range -9.9…189.9°C (14.2…373.8°F)
Operating voltage qp0.6…6: 3.0V lithium battery
qp10…40: 3.6V lithium battery
qp 0.6 1.0 1.5 2.5 3.5 6.0 10 15 25 40
Medium
temperature
EW7730: 20…130°C (68…266°F)
EW7731: 5...105°C (41...221°F)
EW7730: 20…150°C (68…302°F)
EW7731: 5...105°C (41...221°F)
Flow rates
Maximum (qs) m
Nominal (qp) m
3
/h1.2 2 3 5 7 1220305080
3
/h 0.6 1 1.5 2.5 3.5 6 10 15 25 40
Minimum (qi) l/h 6 10 6 10 35 24 40
1
/100 150 250 400
Starting l/h 1 2.5 2.5 4 7 7 15 30 50 80
kvs (cv)-value m3/h 2.06
(2.41)
5.27
(6.17)
5.48
(6.41)
7.91
(9.25)
16.7
(19.5)
16.8
(19.7)
32.5
(38.0)
61.2
(71.6)
94.5
(111)
127
(149)
∆p at qp mbar 85 36 75 100 44 128 95 60 70 100
NOTE: Medium temperature may be limited by installation position, see chapter 'Installation' on page 6.
1
when mounted in horizontal position
EN0H-2600GE25 R1209 2 Honeywell y Subject to change
Function
Integrator
The integrator contains all the necessary circuits for recording
flow rate and temperature and for calculating, logging and
displaying the data. The integrator housing can be mounted
directly onto the volume measuring component or to the wall.
The meter can be conveniently read from a single line sevendigit display with units and symbols. A pushbutton provides
user friendly control of the various display loops. All failures
and faults are recorded automatically and displayed on the
LCD screen. To protect the reading data, all relevant data is
saved in a non-volatile memory (EEPROM). This memory
saves the measured values, device parameters and types of
error at regular intervals
Ultrasonic volume measuring component
The ultrasonic technology of the volume measuring component
permits very high measuring accuracy and can be used in the
supply or return pipeline. The volume measuring component
meets the requirements of EN1434 / class 2 and 3. The standard cable length between the calculator and the volume
measuring component is 1.5m for meters up to qp 6 and 2.5m
for meters qp 10-40 (other cable lengths optionally on request).
Supply voltage:
Standard (12 year life)
• Meters up to qp 6: lithium battery 3.0V DC
• Meters qp 10-40: lithium battery 3.6V DC
Optional (please enquire):
• Meters up to qp 6: lithium battery 3.6V DC (16-year life)
• Meters up to qp 25: mains unit 230V AC or 24V AC
Temperature sensors
Pairs of Pt500 temperature sensors with 2-wire leads are used.
Interfaces
The EW773 Series is equipped as standard with a ZVEI optical
interface with the M-Bus protocol as per EN1434. This interface is used, for example, for communication with the HYDROSET parametrization software. The meter has two slots for plug
and play modules. One slot for a function module and one slot
for a communications module.
The following communication modules are available as options:
•RF module
• M-Bus module to EN1434
• RS232 module
The RS232 module is a serial interface and permits data
exchange with the heat meter. A special data cable is required
for this purpose.
The RF module communicates a list of predefined data
records. This can be edited by the HYDRO-SET software.
Pulse Input
Two additional pulse inputs are available. The pulse value and
the unit is configurable for energy, water, gas or electrical
metering by the HYDRO-SET software. Also two accounting
days are available for both inputs.
Pulse Output
The meter provides levels for two optional external pulse
outputs, which can be freely programmed using the HYDROSET software.
Possible pulse output values
• Energy (standard setting)
• Volume (standard setting)
• Tariff energy 1
• Tariff energy 2
• Tariff condition 1, limit switch
• Tariff condition 2, limit switch
EW773 SERIES ULTRASONIC HYDRONIC METERS
• Energy error
• Volume error
Module Combinations
The following module combinations for data transmission are
available ex works or for retrofitting in the field:
Function modules
• Pulse input module (2 inputs)
• Pulse output module (2 outputs)
• Pulse input module and pulse output module (1 input and 1
output)
• Combined pulse in- and output module (2 inputs / 1 output)
Communication modules
•M-Bus
• RS232
•RF
Accessories / Software
The HYDRO-SET parametrization software based on the MBus is a convenient tool for handling the hydronic meter. It runs
on Windows® 2000, and XP and is used for logs memories:
• setting up for operation
• reading out measured values
• printing of meter logs
• meter configuration
Event Memory
Events such as changes and faults are stored in a non-volatile
memory with a capacity of up to 31 entries. The following
events are recorded:
• Checksum error
• Temperature measurement error
• Ultrasonic echo time measurement errors
• Start and end of test mode
Monthly Memory
The EW773 Series has a history memory of 24 months. The
following values are stored in the EEPROM on the
programmed date 1…31 of the actual month:
• Date / Time
•Volume
• Energy
• Error day counter
• Maximum monthly flow rate
• Maximum monthly power
• Date of maximum monthly flow rate
• Date of maximum monthly power
• Tariff energy 1
• Tariff energy 2
• Tariff definition 1
• Tariff definition 2
• Impulse counter 1
• Impulse counter 2
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EW773 SERIES ULTRASONIC HYDRONIC METERS
Log Memory
The log memory is used to store consumption values. The
storage frequency can be selected from various storage intervals (1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 minutes or the default
setting of 24 hours, see Table 1). The data saved in the log
memory can be used for the following analyses:
• Reading the meter on a certain day
• Example: if the day for reasing is 01.10 (1 October), the
meter reading is displayed for the period from 01.10 of the
previous year to 30.09 of the current year.
• Comparison of the last consumption period with the preceding period
Table 1. Extract of possible log memory settings
Storage
interval
5 minutes Error status, overload
15 minutes 440 110 hours
1 hour 440 18.3 days
24 hours 440 440 days
Values Number of
data
records
440 36.6 hours
time temperature,
overload time flow rate,
forward temperature,
return temperature,
date and time,
energy,
tariff energy 1,
tariff energy 2,
tariff definition 1,
tariff definition 2,
volume,
error day counter
Recording
period
Maximum Values
The integrator creates max. values for power and flow rate
based on consumption time, which are stored in the EEPROM.
The integration intervals are adjustable to 6, 15, 30 or 60
minutes. Default setting is 60 minutes.
Tariff Function
The integrator offers two optional tariff memories for monitoring
plant load states for limit tariffs. Extensive tariff conditions
make it possible to adapte the meter individually to the required
customer-specific applications. Apart from the energy a timebased tariff can also be programmed.
The following limit types are possible (this example applies to
the display with 3 decimal places):
Table 2. Limit types
Type LIMIT LIMIT resolution
∆T 1 ... 190 °C 1 °C
T
P 1 ... 255 kW 1 kW
Q 100 ... 25 500 l/h 100 l/h
1 ... 190 °C 1 °C
Display Control
The readings are displayed on the meter by a 7-digit LCD with
units and symbols
Loop Structure
The EW773 Series display has six loops. Some display
windows consist of two (to maximum seven) displays that are
shown alternately at 4-second intervals.
Some pictures in the loops can be deactivated separately.
NOTE: For quick visual guidance, the loops in the display are
The main loop with the current data, e.g. for energy, volume
and flow rate, is programmed as default setting. In the standard
setting loop No. 5 (tariff loop) is not active.
numbered from 1 to 6.
Fig. 1. Loop overview
EN0H-2600GE25 R1209 4 Honeywell y Subject to change
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