Seametrics MD-Series - Manual

General Information
MD-Series meters use the multi-jet principle, which has
been an internationally-accepted standard for many
years. This type of meter is known for its wide range,
simplicity, and accuracy in low-quality water. The
impeller is centered in a ring of jets, with inlet jets on
one level and outlet jets on another. A gear train drives
the register totalizer dials. For pulse output, one of the
dials is replaced by a gear, which turns a magnet that
is detected by an encapsulated sensor threaded into
the outside of the lens. Pulse rate is determined by the
gear and the dial on which the gear is placed.
Mechanically, all MD-Series meters are the same. The
difference between MDE and MDR meters is in the sen-
sor. MDE meters use a solid-state, long-lasting Hall-
effect sensor, which requires power. They are suited
for use with SeaMetrics controls and metering pumps
(LMI for instance) which have sensor power. MDR
meters use a two-wire reed switch. They provide a dry
contact closure and do not require power. MDT meters
do not have a sensor, totalize only.
Features
MD-Series Pulse Meter
Instructions
Specifications
Materials
Case Cast bronze
Internals Engineered thermoplastic
Magnet Ceramic permanent
Temperature 105
°
F, 40
°
C
Max. Pressure 150 PSI operating
Accuracy 1-1/2% of reading
Sensor
MDE Solid state
MDR Reed switch
Max. Current
MDE 20 mA
MDR 50 mA
Max. Voltage
MDE 24 VDC
MDR 24 VDC or 24 VAC
Sensor Power (MDE) Minimum 6 mA at 12 VDC
Cable Length 18 ft. standard, 2,000 ft. max.
Flow Rates (GPM):
Page 1 of 4
Either MDE or MDR sensor
threads into lens without
removing top
Cast bronze body-
meets AWWA
specifications
Union end couplings
for easy service
Connector for metering pump or
SeaMetrics control - optional
3/4" 1" 1-1/2" 2"
Minimum 0.22 0.44 0.88 1.98
Maximum 22 52 88 132
DIS
CON
TIN
UED