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Flow data
Flow rates according to MID
Minimum (qi)
Nominal (qp)
Maximum (qs)
Dynamic range (qp/qi)
Additional flow data
Starting flowrate
Overload flow rate
Pressure loss @ qp
Sizing
• EW447-452 Series mechanical meters should be selected in such a way that typical system flow rates are between approved
minimum (qi) and maximum flow rate (qs)
• Overload flow rate may be reached for not more than 15 minutes per day
• Flow rates below minimum and above maximum should be avoided
Function
Flow sensor
Supply temperature
sensor
Fig. 3. EW447 components
Energy Calculator
The energy calculator (or simply 'calculator') contains circuits
for recording flow rate and temperature and for calculating,
logging and displaying data.
The meter can be read from a single line seven-digit display
with units and symbols. A push button provides control of
various display loops. All failures and faults are recorded auto-
matically and displayed on the LCD screen. For protection all
relevant data is saved in a non-volatile memory (EEPROM).
This memory saves measured values, device parameters and
types of error at regular intervals.
Flow Sensor
The multijet technology of the flow sensor permits high
measuring accuracy. Standard place of installation is return
pipeline. For installation in supply a different version has to be
used. Meters cannot be reconfigured from return to supply
pipeline usage in the field.
Honeywell All rights reserved
Table 1. Flow rates EW447-452 Series
DN
15
15
l/h
6
15
m³/h
0.6
1.5
m³/h
1.2
3
1:100
100:1
l/h
1.5-2
3-4
m³/h
243
243
Energy calculator
Return temperature
sensor
EW447-EW452 SERIES MECHANICAL HEATMETERS
20
25
25
25
70
120
2.5
3.5
6
5
7
12
100:1
50:1
50:1
5-6
35
60
242
170
190
Power Supply
Non replaceable lithium battery 3.0V DC with 10 + 2 year life-
time (10 year nominal lifetime, 1 year for storage an 1 year
buffer). Nominal lifetime relates to normal usage. Battery life-
time is decreased by shorter readout intervals, longer data tele-
grams, etc.
Temperature sensors
EW447-452 Series mechanical meters are supplied with
installed Pt500 temperature sensors with 2-wire leads,
Ø5.2mm. The temperature sensors are permanently installed
to the meter and cannot be replaced. Sensor cable lengths are
as follows:
EW447 and 450
EW448 and 451
EW449 and 452
Interfaces
EW447-452 Series mechanical meters are equipped with a
ZVEI optical interface for communication and testing as stan-
dard. Further all meters are available with either RF, MBus or
pulse output. For more details on interfaces see chapter
"Communication and Readout" below.
3
40
50
65
200
300
500
10
15
25
20
30
50
50:1
50:1
50:1
100
60
60
50
50
240
62
142
• Supply: 1.5m
• Return: 0.4m with sensor installed in
housing of flow sensor
• Supply: 3.0m
• Return: 1.5m with sensor installed in
housing of flow sensor
• Supply: 6m
• Return: 6m
EN0H-2601GE25 R0413
80
100
800
1,200
40
60
80
120
50:1
50:1
90
90
110
140
80
100
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