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EW447-EW452 SERIES MECHANICAL HEATMETERS
GENERAL
Application
Honeywell EW447-452 Series mechanical meters are compact
heat or chilled water meters with electronic measurement
based on the multijet principle, consisting of an electronic
energy calculator, a multijet flow sensor and two temperature
sensors.
They are used for metering of hydronic heating and/or cooling
energy in hydronic systems based on volume, supply and
return temperature.
EW447-449 models are suitable for energy metering in heating
systems ('heat metering').
EW450-452 models are suitable for energy metering in
heating, cooling or combined systems.
Features
• Approval for meter with dynamic range of 100:1 (qp:qi)
in class 2
• Lithium battery, battery lifetime 12 years
• Optical interface as standard
• Rotatable calculator
• Optionally with integrated radio, Open Metering
Standard, 868MHz
Design
EW447-452 Series mechanical meters consist of:
• Electronic energy calculator with power supply and fixed to
mechanical flow sensor
• Factory fitted supply and return temperature sensors
• Optionally M-Bus or pulse output function
• Flow sensor with external threads according to ISO228
(DN15...DN40) or flanges PN16 (DN32...DN100)
• EW45x versions with potted electronics
Materials
• Front panel of energy calculator made of dark grey plastic
with laser markings for approval, flow and other product
information
• Housing of energy calculator made of dark grey plastic
• EW447 and 452: housing of flow sensor made of unpainted
brass
• EW448, 449, 451 and 452: housing of flow sensor made of
brass, painted dark grey
Approvals
Heating
• DN15...20: MID class 2 (DE-07-MI004-PTB030) and
EN1434 (22.52 / 00.02)
• DN25...40: MID class 2 (DE-09-MI004-PTB001) and
EN1434 (22.52 / 06.02)
• DN50...100: EN1434 (22.52 / 01.02)
EN0H-2601GE25 R0413
TECHNICAL DETAILS
Specifications
Sizes
Medium
Medium temperature
Ambient temperature 5...55°C
Storage temperature
Operating pressure
Protection class
Measuring process
Display
Display units
Display values
Values displayed
Measuring cycle
volume
Measuring cycle
temperature
Temperature diffe-
rence
Starting temperature
difference
Absolute temperature
measuring range
Temperature sensors Pt500 with 2-wire leads
Operating voltage
Ambient class
Battery lifetime
Interfaces
2
DN15...DN100
qp0.6...60m³/h
Water, quality to VDI2035
5...90°C
-20...55°C
max. 16bar
IP54 (EW44x)
Fully electronic compact heat meter
with direct impeller scanning
(EW447, 448, 450 and 451) or
impeller scanning via magnetic
coupling with sensors (EW449 and
452)
LCD, 7-digit
MWh, kWh, GJ, MJ, kW, m³/h, l/h,
m³ and l
9 999 999, 999 999.9, 99 999.99,
9 999.999
Power, energy, flow rate, tempera-
ture, energy on readout date,
readout date
16s
32s
max. 147K
0.25K
0...150°C
3.0V
Class C + M1
10 + 2 years
Optical
Optional interfaces
Honeywell All rights reserved
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