Veeder-Root 1871 Installation Instructions

1. DESCRIPTION
A. GENERAL. These instructions are for installation of the Model 1871
Pulse Transmitter. Figure 1, designed and manufactured by Veeder-
Root Company. 2709 Route 764, Duncansville, PA 16635 (USA),
(814) 695-4476.
The series 1871 pulse transmitter has been designed for use with
gasoline pump computers and miscellaneous electrical counters in
remote indicating and data systems. It provides fast, accurate pulsing
for counters, printers, and stepping motors used with remote indicating,
totalizing, and data systems.
The pulse transmitter chops a fixed level input voltage to form a square
wave pulse with minimum contact bounce for use with transistorized
circuits.
The Series 1871 pulser consists of a rugged die cast explosion-proof
housing with a screw type cover for easy access to the pulsing
mechanism. The transmitter utilizes a dry-reed switch, magnet, and
gear train, synchronized to provide 1 pulse per revolution. Long life is a
feature of this unit.
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
Pulse Frequency: 1 cycle per revolution of input shaft.
Contact Rating: Maximum 50 VA resistive, not to exceed 250 V or
3 amperes.
Type Switch: Single pole, single throw.
Contact Resistance: 500 milliohms.
Actuating Time: I millisecond average.
Contact Bounce: I millisecond average.
Speed: 0 to 3000 pulses per minute. 300 rpm maximum input shaft
speed.
Pulse Timing: 50%±10% on, the balance off.
Mounting Position: Operable in any position, clockwise or
counterclockwise rotation.
Operating Temperature: -40° to + 60° C (-40° to + 140° F) at
maximum ambient temperature of 60° C (140° F).
Torque: 3.0 oz-in. (216.2 g-cm) maximum.
Life Expectancy: Up to 200 million pulses, depending on electrical
loads and input shaft speed.
Contact Protection: Arc suppression is required when used in
inductive circuits. Type and value of suppression will vary with coil
and coil voltages under consideration.
Housing: Explosion-proof
Manual No. 252076, Rev H, Sept. 2021
VEEDER-ROOT
INSTALLATION
INSTRUCTIONS
MODEL 1871
PULSE TRANSMITTER
Manual No. 252076, Rev. H, Sept. 2021
Figure 1. 1871 Pulse Transmitter
Cover Assembly: Corrosion Inhibiting Multi-Purpose Synthetic grease
(Vischem 352 or equivalent) may be applied on pulse 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 are
provided on the shaft end of the housing for mounting.
*Wiring Note:
The internal earth point screw must not exceed 4 mm in length.
OPTIONS
Standard models of the 1871 have an output of 1 pulse per revolution
of the input shaft and should be so specified when ordering. Other
ratios may be most economically obtained via customer supplied
external gearing. The simplest method to use two spur gears one
mounted on the pulse transmitter input shaft, the mating gear mounted
on the customer drive. Ratio pulses of 2, 5 & 10 per revolution can be
obtained by special order from the factory. Also available are non-
standard input shafts, contact Factory for details.
Approved – certified cable and cable gland to be supplied and installed
by customer or end user for final installation
Technical Manual
Issued: 09/2021
Supersedes:
05/2018
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