Veeder-Root 7671 Installation Instructions

1. DESCRIPTION
A. GENERAL. These instructions are for installation of the Model
7671 Solid State Pulse Transmitter. Figure 1, designed and
manufactured by Veeder-Root Company, 2709 Route 764,
Duncansville PA 16635 (USA), (814) 695-4476.
These solid state pulse transmitters provide fast and accurate signaling
for remote indication on totalizing and data monitoring systems. They
are certified for gasoline pump computers and applications that require
monitoring of output shaft rotation in hazardous locations.
The output can be either dual channel with 50 pulses per revolution per
channel or single channel with 100 pulses per revolution. The duel
channel pulse trains can be staggered or overlapping. A staggered
output allows errors to be detected on either channel or on both
concurrently (power loss to pulser). An overlapping (quadrature)
output permits the detection of direction of rotation and errors on either
channel but not both concurrently. The single channel devices are
used when greater pulse density is desired and error detection is not
required.
2. SPECIFICATIONS
Specifications listed are standard unless otherwise noted. Optional
features are available at additional cost.
Approvals:
IECEx compliance per IEC 60079-0:2017 & IEC 60079-1: 2014
ATEX compliance per EN IEC 60079-0:2018 & EN 60079-1: 2014
UKCA compliance per EN IEC 60079-0:2018 & EN 60079-1:2014
Recommended Operating Conditions (each channel):
Power Requirement: 10 to 15 VDC; 50 mA (max.) at 15 VDC.
Output Voltage: Dependent on load. See Figure 2.
Switching Times: Rise Time: 2 microseconds maximum with 10
mA resistive load to ground. Fall time: 4 microseconds
maximum.
Rotation: Standard is bidirectional. Optional models available with no-
back feature.
Input Shaft Speed: 600 rpm maximum.
Torque: 2 oz-in. maximum (144 g-cm).
Output Pulse: Dual channel at 50 ppr, staggered or over
lapping (quadrature). Single channel at 100 ppr. See
Figure 2.
Duty Cycle:
Overlapping/Quadrature: 50% ±10% high/low ratio. Second
channel phase displaced by 90° ± 18°.
Staggered: 75% ± 5% high/low ratio. Second channel displaced by
180° ± 18°
Single Channel: 50% ± 10% high/low ratio.
Manual No. 251849, Rev K, Sept. 2021
VEEDER-ROOT
INSTALLATION
INSTRUCTIONS
MODEL 7671
PULSE TRANSMITTER
Manual No. 251849, Rev. K, Sept. 2021
Figure 1.
Model 7671 Solid State Pulse Transmitter
Operating Environment: -40° to +60° C (-40° to + 140° F) at
maximum ambient temperature of 60° C (140° F)
Storage Environment: -55° to + 125°C (-67° to +257°F).
Shaft: Specify length of either 10.4 or 16.5 mm (0.410 or
0.650 inch).
Shock: Normal shipping.
Housing: Explosion-proof.
Cover Assembly: Corrosion Inhibiting Multi-Purpose Synthetic
Grease (Vischem 352 or equivalent) may be applied on pulser
transmitter cover threaded joint surface before assembly in
accordance with the grease manufacturers specifications.
Mounting: Three ¼ -20 NC-2 blind tapped holes, spaced 120°
apart on a 63.5 mm (2.5") diameter bolt circle.
Models 7671xx-xxx* Bidirectional
Dual Channel (overlap)
Dual Channel (staggered)
Single Channel
* Third digit of suffix number indicates length of shaft.
Contact factory for details.
Note: Consult Veeder-Root on any unusual applications,
Installation, or possible modification of this basic design.
Technical Manual
Issued: 09/2021
Supersedes:
05/2018
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Clockwise
clockwise
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