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8.1.1.1 Volume conversion device (temperature compensation) and electronic
calibration
The temperature compensation function and electronic calibration is added by the connection
of an alternative pulser designated the MPE which enables the pulse output stream to be
adjusted.
8.1.1.2 Electronic Calibration
Electronic calibration is effected by adjusting the number of pulses per rotation of the meter
output shaft.
8.1.1.3 Temperature compensation
The volume of fuel passing through the meter is corrected to 15°C by monitoring the
temperature of the fluid passing through the meter and adjusting the number of pulses per
rotation of the meter output shaft.
The pulse output is no longer a fixed number of pulses per rotation of the meter output shaft,
but adjusts the volume of fuel as if it is dispensed at 15°C.
8.1.2 CONSTRUCTION - MPE pulser
The MPE has a pulser circuit that includes a real time clock, which enables an event logger to
record all changes to pulser programming, whether these be modifications to the temperature
compensation parameters (fuel type etc) or electronic calibration activities.
For temperature compensation operation the MPE pulser incorporates a second cable entry to
provide a connection port for a temperature probe which is fitted through the meter cover plate,
such that the probe tip is immersed in the fuel being dispensed. The probe tip does not come
into contact with any meter components. The probe cable is routed to the electronic circuit
board within its associated pulser housing.
The probe is a Class A, PT100 type device. There is no regular calibration required of the
probe and the pulser checks the temperature probe for errors.
8.1.2.1 Installation
The pulser cable carries an additional 2 cores, which are a communication link to the
intelligent pulser circuit board. The other 4 cores are the traditional power and pulse output
signals. The cable routes up to the dispenser calculator enclosure and routes to a hand set
connection circuit board within a steel pulser sealing box (PSB). Connectors are provided to
link the pulser communication port to a standard Tokheim plug-in programming handset.
8.1.2.2 Indication of measurement result
A legend shall be affixed adjacent to the volume indication clearly indicating that the volume
dispensed is corrected to 15°C.
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