Section IV – Diagrams
MN06135 Issue/Rev. 1.3 (6/17) 33
Promass 80, 83, and 84 Coriolis Meters
When connecting the Promass 84 (does not apply to the Promass 80 or 83 models) to an AccuLoad, it is im-
portant that the “Line Monitoring” function on the Promass 84 be disabled. This is because the pulse input circuitry
of the AccuLoad requires the input pulse “off” voltage to be less than one volt (and the “on” voltage to be greater
than 5 volts). If the “Line Monitoring” on the Promass 84 is enabled, the “off” voltage of the pulses will be greater
than one volt and therefore will not be counted by the Accuload. There are three jumpers on each of the frequen-
cy output submodules on the I/O board that enable/disable the “Line Monitoring” function. The factory default is to
enable “Line Monitoring”. Follow the steps from section 6.4.2 of the Proline Promass 84 Operating Instruction –
Bulletin MN0M032 to enable/disable this function.
Table 7. Promass Modeling for Single Pulse Wiring
Table 8. Promass Modeling for Dual Pulse Wiring
Note: In dual pulse mode, Output 1 (24/25) leads Output 2 (22/23) when flowing in the forward direction.
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