Turbine Meter Instrumentation

Technical Guide

DAN-LIQ-Turbine Meter-TG-0807

August 2007

The turbine pickoff coil has a high impedance and offers only a low voltage output. Transmission of flow signals requires low impedance and high voltage, and so amplification of the pickoff signal is required.

Daniel Series 1200 and 1500 Liquid Turbine Flow Meters are supplied with the UMB and a dual channel preamplifier as standard. The preamplifier shapes and conditions the pickoff output signal, rendering it suitable for transmission over distances of up to 3,000 feet, with the appropriate cabling.

The UMB allows for either one or two pickoffs. The outputs from the two pickoffs are 90o electrically out of phase, thus facilitating proper dual pulse fidelity checking.

Pickoff Specifications

Type: 2-wire reluctance

Resistance: 600-900 Ohms

Inductance: 250 mH max.

Output: Sinusoidal 40mV p-p minimum @minimum flow with preamplifier load

Optional: 2, 3* or 4* pickoff coils *with dual UMB

Preamplifier Performance -

Dual Channel Preamplifier

Inputs:

Supply voltage: 10 - 30 Vdc

Minimum input signal amplitude: 40mV p-p minimum

Powered Pulse Output

Output: 0 to 5V square wave

Frequency range: 0 to 5 kHz Loading: 1 kOhm internal pull-up

Variable Voltage Output

Output: 0 to supply voltage square wave

Frequency range: 0 to 5 kHz Loading: 1 kOhm internal pull-up

Open Collector Output

Output: Square wave

Frequency range: 0 to 5 kHz

Maximum voltage: 30 Vdc

Maximum current: 125 mA

Maximum power: 0.5 Watts

Transmission Distance Without preamp: 20ft (6.1m)

Belden 88442 or equivalent

With preamp: 3,000ft (914m)

Belden 8770 or equivalent

Hazardous Area Classifications

UL / CUL Class 1, Division 1, groups C&D

Nema 4 UL, CUL

CE certified EEx d IIB T6 (ATEX)

DUAL CHANNEL PREAMP

Figure 15 - DualTERMINALChannelIDENTIFICATIONPreamp Terminal Identification Customer Connections

CUSTOMER CONNECTIONS

PICKOFF

WHITE

BLACK OR

RED

CHANNEL A

TB1

2 TB2

1	2	3	4	5
CHA. B OUTPUT COMMON CHA. A OUTPUT COMMON +10 TO 30 VDC

1 TB3

BLACK OR

RED

WHITE

CHANNEL B

PICKOFF

J3 J4

	J1		J2

PREAMP JUMPER CONFIGURATIONS


		JUMPER POSITIONS
JUMPER	A	B	OUT
J1-CHAN. A INPUT	N/A	40mV. PP MIN	N/A
J1-CHAN. B INPUT	N/A	40mV. PP MIN	N/A
J3-CHAN. A OUTPUT	5V.PULSE	SUP. VOLT. PULSE (10-30 VDC)	O.C.
J4-CHAN. B OUTPUT	5V.PULSE	SUP. VOLT. PULSE (10-30 VDC)	O.C.

Page 19