ModeL pd684 & pd689 Loop-powered rate/totaLizers
2
keY FeatUres
Through significant innovation in technology and design,
we developed the Loop Leader
TM
Series of loop-powered
rate/totalizers, which are loaded with standard features and built
for tough industrial environments.
Full Featured
Everything comes standard with these meters. The competition
may charge extra for loop-powered backlighting, open collector
output and programmable exponent capability, but these and a
host of other key features are standard on these indicators.
Install Just About Anywhere
Indoors, outdoors, bright sunlight, dimly lit plant, wet, dirty, hot or
cold- these indicators go just about anywhere. Their shallow-depth
case, FM Type 4X front, loop-powered backlighting, and wide
operating temperature range are all standard features. And the PD689
with its FM Approval and CSA Certification can be installed in just
about any hazardous location.
Alternating Rate/Total Display
Press Enter/ACK button to alternate between rate and total
or program the totalizer so the display automatically changes
between displaying rate and total every 10 seconds. This
feature is particularly useful if the meters are mounted inside a
NEMA 4X or an explosion-proof enclosure.
GPM
R
GAL
T
KEY:
= Screens Toggle
RATE
TOTAL
4-20 mA Input Connections
S+ S- B+ B-
4-20 mA
Transmitter
Power
Supply
S+ S- B+ B-
4-20 mA
Transmitter
Power
Supply
Wiring with Backlight
Wiring without Backlight
Square Root Function
The square root extraction feature displays flow rate by extracting
the square root from a differential pressure transmitter signal.
The user selectable low-flow cutoff feature gives a reading of
zero when the flow rate drops below a user selectable value.
Displays Flow Rate
User Selectable Low-Flow Cutoff
Only 2 Calibration Points Required
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FLOW
Trend Arrow
5 Digits, 0.6” High
Bargraph
Engineering Notation
Custom Engineering Units
Backlight is Standard
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