1 Introduction
This manual contains information for the installation and operation of the PM4-TR Monitor. The
instrument may be set to operate as a ratemeter or totaliser or allow toggling between rate and
total displays. The SEt OPER function (see section 7.66) allows selection of one of these three
modes. The three modes of operation are:
•totL - totaliser/counter display. The input pulses are totalised, scaled in engineering units
and displayed e.g. Total litres, mm etc. Count up or count down is possible. A total and
grand total may be viewed and reset separately. The grand total is a separate total memory
which allows storage of all the previous totals, alternatively the grand total can be used to
store the number of batches. Explanation and examples of the totaliser functions are given
in the “Totaliser Explanation of Functions” chapter. The totaliser is scaled via the totL
INPt (see section 7.35) and totL SCLE (see section 7.36) functions.
•FREQ - frequency/rate display. The frequency or rate of the input may be scaled in engi-
neering units and displayed e.g. R.P.M, Bottles/min., Litres/hour etc.. For low frequency
inputs (input always below 1kHz) there is an option of displaying either rate or period. Ex-
planation and examples of the ratemeter functions are given in the “Ratemeter Explanation
of Functions” chapter. The ratemeter is scaled via the RAtE INPt (see section 7.29) and
RAtE SCLE (see section 7.30) functions.
•both - total/rate display (display may be toggled to either total or rate). This mode is
primarily used when the display is required to toggle between a rate and total display via
an external contact closure or via the front panel ^and vbuttons (only fitted on certain
display options). For low frequency inputs (input always below 1kHz) there is an option of
toggling between rate/total or rate/period. A total and grand total may be viewed and reset
separately. Explanation of the totaliser functions and setup examples are given in the “Both
Mode Explanation of Functions” chapter.
Selection of operating mode, calibration and scaling are all accomplished by push button operation
(see page 26 for details). Display prompts are given for each function to assist in setting up
the instrument. Changes to input sensor type or optional outputs may require dismantling the
instrument to alter PCB links.
An inbuilt relay provides an alarm/control function, optional relays (giving up to 7 in total),
optically isolated analog (single or dual channel), serial or digital (BCD or binary) re-transmission
and isolated excitation voltage may also be optionally provided. The single analog output option
can be set for retransmission or PI rate control. The dual analog output option allows output 1 to
be set for PI or retransmission, the second output can be set for retransmission only.
Unless otherwise specified at the time of order, your PM4 has been factory set to a standard
configuration, see the function table for your selected mode for default settings. Full electrical
isolation between power supply, input voltage and re-transmission output is provided by the PM4,
thereby eliminating grounding and common voltage problems. This isolation feature makes the
PM4 ideal for interfacing to computers, PLCs and other data acquisition devices.
The PM4 series of Panel Mount Monitors are designed for high reliability in industrial applications.
The high brightness LED display provides good visibility, even in areas with high ambient light
levels.
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