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OCT 2013 DANIEL™ SERIES 1500 TURBINE METER
INSTALLATION3-6
3.4 Pickoff Coils And Electrical Connections
A. Pickoff Coils
The Series 1500 Turbine has the capacity for single or dual pickoff coils mounted 90° electrically
out of phase. Each pickoff produces A low level sine wave signal which varies in amplitude (mV)
and frequency (Hz), proportional to the velocity of the turbine blades. This signal information is
coupled to the input terminals of the preamplifier.
The optional dual UMB Turbine Meter can be configured with up to four pickoff coils, each pair
mounted 90° electrically out of phase.
B. Electrical Connections
Pickoff input signal connections are made at terminal strip connection TB2 for Channel A, and TB,3
for Channel B. Power supply and output signal connections are made at terminal strip TB1.
Reference Figure 3-2. For single channel wiring use Belden 8770, or equivalent. Earth ground shield
at one end only. Terminate shield and insulate it at the other end. For dual channel wiring use Belden
8770, or equivalent for power and channel A signal. Use Belden 8219, or equivalent for channel B.
Connect both shields to earth ground at one end of cables and terminate and insulate shields at the
other end. UMB housing should be at earth ground.
C. Induced Interference
The Turbine meter should be located as far as possible from any electrical equipment such as
motors, solenoids or relays which could induce an interference signal into the turbine meter pickoff
coil. High amplitude interference introduced into the preamplifier can result in interference with the
flow signal.
Proper shielding and an earth grounded UMB housing will greatly reduce the possibility of induced
interference. See Section 3.6 B, Electrical Connections.
D. Accessory Hookup
General considerations: It is important that the appropriate service manual be referenced before
attempting to use accessories or instrumentation with the Series 1500 Turbine. If service manuals
for instrumentation were not received at the time of purchase or delivery, please contact the factory
or nearest Daniel Measurement and Control Sales and Service Office.