Turbines PA714 User manual

PA714
Pulse Amplifier
Installation and Operation Manual

Turbines, Inc.
PA714 Pulse Amplifier
pg
2
SPECIFICATIONS
Temperature:
Operating -40 to 85°C
Storage -65 to 125°C
Input Voltage:
6-28 VDC; 5 mA @ 24 VDC
Protected against polarity reversal
Signal Input:
Frequency 0-10 KHz
Amplitude 20 mVp-p minimum sine or square wave
Sensitivity field adjustable
Impedance 10K @ 10KHz
Output:
6-28 VDC squarewave proportional to input voltage
Minimum load @ 250 ohms
Short circuit protection
Features:
Individual LED indicators for power and output signal
Built in test oscillator that injects 4 Hz test signal when test P/B
depressed
Mounts directly on flowmeter
Enclosure:
FM Approved, CSA Certified
Class I Groups B, C, D
Class II Groups E, F, G
Weight 1.7 lbs.
The PA714 is a meter-mounted device that amplifies and conditions low amplitude signals such
as those developed by a magnetic pickup coil. The amplitude of the squarewave output equals
the input supply voltage of the PA714. Signal amplification and conditioning permits trouble free
interfacing between low amplitude signal sources and electronic devices requiring pulse inputs.
The sensitivity adjustment permits the PA714 to discriminate between an input signal and noise
by increasing (CCW) or decreasing (CW) the input signal amplitude necessary to be processed
as a valid signal. This, in conjunction with direct mounting, allows the PA714 to operate
effectively in noisy environments.
The PA714 contains a built-in test oscillator that enables the operator to verify the amplifiers
operation without a signal source. The power LED illuminates when the input supply voltage is
present.

Turbines, Inc.
PA714 Pulse Amplifier
pg
3
BENCH TEST CALIBRATION PROCEDURE
Required Equipment: Power Supply 6-28 Vdc, Frequency Generator, Oscilloscope
Test Procedure:
A)
Connect power supply positive & negative leads to J1-3,5; respectively
B)
Connect oscilloscope positive & negative leads to J1-4,5; respectively
C)
Connect frequency generator positive & negative leads to J1-1,2; respectively.
Set function to sinewave, amplitude to zero
D)
Install jumper @ JU1, Set “Sensitivity” (R1) fully counterclockwise
E)
Turn power supply “ON”, set voltage between 6-26Vdc, observe LED D1
illuminates and oscilloscope displays a .6V DC level maximum
F)
Depress S1, LED D2 flashes and the oscilloscope will display a 4Hz
squarewave with a positive amplitude .6V < power supply positive potential
and the negative amplitude will be .6V > power supply negative potential
G)
Release S1, Set “Sensitivity” (R1) fully clockwise. On the frequency
generator set the amplitude to 20mV and the frequency between 1 to 10KHz
H)
Oscilloscope will display a squarewave at the same frequency selected in step
G. The squarewave amplitude will be the same as step F.
I)
While observing the oscilloscope display, momentarily terminals J1-4 & 5
together. The oscilloscope display will be a slight squarewave with an
amplitude .6 or less. When the short is removed the oscilloscope display will
return to the normal amplitude squarewave.
Field Test:
A)
Insure that ALL connections are correct and secure.
B)
LED D1 should be illuminated, if not check supply voltage @ J1-3,5. Note that
J1-3 must be positive in respect to J1-5 to function.
C)
Install jumper JU1 if not already installed, set “Sensitivity”; R1 Mid range.
D)
Depress S1 and observe LED D2 flashes - No go; Remove wire @ J1-1
Retest, No go- replace pulse amplifier.
E)
Given proper flow exists, LED D2 should be flashing (High flow rate will make
D2 appear to be illuminated steadily) If D2 is “OFF” rotate “Sensitivity” (R1)
clockwise until D2 illuminates. If D2 remains “OFF” check pickup coil and
flowmeter.

Turbines, Inc.
PA714 Pulse Amplifier
pg
4