Flowmetrics PA-1001A Operation Manual
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INSTALATION, OPERATION & MAINTENANCE
MANUAL
FOR
PA-1001A Series
SIGNAL CONDITIONER
& CONVERTORS
PA1001A – 7/02 Page 1 of 11
SIGNAL CONDITIONER &
CONVERTERS
PA1001A Series
INTRODUCTION:
The PA1001A series preamplifiers/signal conditioners and converters are suitable for use
with either magnetic or RF type pickup coils and allow convenient interfacing with process
measuring devices and digital electronics.
When used with Magnetic type pickups they accept low level signals and produces a pulse
output, while providing rejection of unwanted noise and false signals.
A RF type pickup reduces the pickup drag associated with conventional magnetic pickups,
resulting in a significant increase in the usable range. The PA1001A series excite a RF type
pickup with a 20KHz signal. Motion of ferrous material is sensed and the motion modulates
the coil field and subsequent conditioning provides a pulse output signal.
The output signal of the PA1001A series have a square pulse wave form, each pulse
representative of an actuator (rotor blade, gear tooth, turbine blade, etc.) passing by the
sensing area of the pickup.
Four output signal options are available:
i. TTL/CMOS compatible
ii. Open collector
iii. 0 to 10VDC square wave and
iv.
The unit is powered by a user supplied 8 to 30 VDC filtered power supply. An on-board
regulator provides the required regulation and noise rejection.
Optional features include factory installed pulse scaling and field installable plug in modules
for Analog output. Pulse scaling provides the user with scaling options of ÷2, ÷4, ÷8, ÷16,
÷32, ÷64, or ÷128, which is useful when a remote device has a maximum count speed that
is less than the pulse-generating device. Analog output provides a current and voltage
outputs proportional to RPM, flow rate etc.
A square wave that is tied to the input power
.
PA1001A – 7/02 Page 2 of 11
CHARACTERISTICS AND SPECIFICATIONS:
POWER INPUT:
• Voltage: 8-30 VDC
• Current Draw: 125mA @ 24VDC, with all options equipped.
• Reverse polarity protected
PICKUP INPUT:
RF Pickup
• Modulation Carrier Frequency: 20KHz
• Input Frequency: 2 Hz to 5KHz, adjustable trigger level
• Trigger Sensitivity: 20 millivolt peak to peak (minimum)
• Carrier Adjustment: to allow precise tuning of carrier signal to physical environment (e.g. air gap,
wall thickness)
• Maximum Air Gap: 0.160”
• Preferred Coil Inductance: 1.0 milliHenry +/- 10%
• Maximum Distance From Pickup To Preamplifier 100 feet
Magnetic Pickup
• Input protected, RF and band pass filtered
• Input Frequency: 0 to 10KHz, adjustable trigger level
• Trigger Sensitivity: 4 millivolt RMS (minimum)
NOTE: At 4mV frequency range 10 Hz to 3KHz
• Input Impedance: 40K Ohms (nominal)
• Maximum Input Signal: 600 Volts RMS
• Maximum Distance From Pickup To Preamp: 100 feet
PULSE OUTPUTS:
• TTL/CMOS (Standard); Fan-out of 5 TTL/CMOS loads
• Open Collector: Maximum OFF state voltage 30 VDC
Maximum ON current 0.40 amps
• 0 to 10 VDC square wave
• Square wave tied to input voltage
• Pulse scaling (option): ÷2, ÷4, ÷8, ÷16, ÷32, ÷64, or ÷128 user selectable.
CURRENT OUTPUT OPTION:
• Accuracy +/- 0.05% of full-scale +/-200 PPM/°C.
• Available range 4 to 20mA.
• Output suitable for driving floating or grounded loads.
• Maximum loop impedance 500 ohms.
• Response time 0.3 seconds for 10 to 90 %.
VOLTAGE OUTPUT OPTION:
• Accuracy +/- 0.05% of full-scale +/-200 PPM/°C.
• Available range 0 to 5VDC or 0 to 10VDC, user selectable.
• Impedance less than 10 ohms.
• Response time 0.3 seconds for 10 to 90 %.
:
:
PA1001A – 7/02 Page 3 of 11
ENVIRONMENTAL:
• OPERATING: -40°C TO 85°C
• STORAGE: -40°C TO 150°C
ENCLOSURES:
• Unit is intended for mounting in a conduit box and comes with 2 ½” on center mounting holes. An
optional explosion proof or NEMA-4x enclosure is available upon request.
APPROVALS:
• EN50081-1:1992 Generic Emission Standard
• EN50082-2:1995 Generic Immunity Requirements
• CE compliant to EMC Directive 89/336/EECfor uses in residential, commercial, light or heavy
industrial environments.
INSTALLATION AND WIRING DETAILS:
In considering the interconnections between the PA1001A and the measurement system some
attention must be given to anticipated noise sources and to the coupling of these noise sources to the
interconnecting wiring.
Noise signals may be coupled into the wiringbetween the pickup coil, the PA1001A, and the
electronic measuring systems. In general, utilizing a shielded, twisted pair for the interconnection
greatly reduces this coupling. The shield should be grounded on both ends of the cable.
However, even with proper interconnecting cabling, cross talk with other signal lines or power lines
may still occur and should be avoided. Physical isolation of the wiring reduces the chance of
potential problems.
The pickup coil should not be located more than 100 feet from the PA1001A preamplifier
recommended that the PA1001A be installed on or near the pickup coil to assure optimum
performance.
INSTALLATION:
The Model PA1001A should be placed in a convenient location that maintains access to the unit
should repairs or readjustment is required.
Connections to the terminal block should be carefully dressed to avoid having bare wires extend pass
the screw clamp on the terminal block. This is particularly important when the PC card is mounted
within an explosion proof enclosure. Wires should be neatly dressed near bottom of enclosure to
prevent problems when cover is installed.
For compliance with EMI/RFI requirements the pre-amplifier must be installed in a metal enclosure
such as a suitable NEMA 4 (e.g. GUAC) junction box. The enclosure must be properly grounded.
Also a grounding strap is required from the enclosure to the power supply common (pin 7).
The cable entry requires 360° grounding coverage to the enclosure case. This is obtained by using
twisted pair with full braid cable and a cable fitting that provides a metal to metal cable clamping
connection. The insulation of the cables should be stripped back to allow for connection to the
terminal block and allow for the cable fitting to clamp onto the braided shield. Any open areas should
then be covered using foil tape.
. It is
In hazardous locations where metal conduit is used, 360° grounding are achieved. All cable shields
should be terminated to the enclosure-grounding stud.
PA1001A – 7/02 Page 4 of 11
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