Section 1 - General; Product Description 1.1 - Partlow MRC 7800 Installation, Wiring, Operation Manual

Product Description 1.1

1.1.1 GENERAL
The instrument is a microprocessor based circular chart recorder capable of measuring,
displaying, recording, and datalogging flow process variables. Three square root extraction
algorithms are available for use with a variety of transmitters and transducers, and four
algorithms are available for use with a variety of weirs and flumes.
Recording functions, alarm settings, and other parameters are easily entered via the front
keypad. All user data can be protected from unauthorized changes by the Enable mode
security system, and is protected against loss from AC power failure by battery back-up.
The process input for each pen is user configurable to directly connect to either mVDC, VDC,
or mADC inputs. Changes in input type are easily accomplished in the field. The unit's
process input is isolated from the rest of the unit. An isolated 24VDC regulated transmitter
power supply can be provided for use with two-wire mADC inputs.
The unit can be ordered for either 115VAC or 230VAC power at 50/60Hz. The 230VAC
option includes a switch for changing back and forth between 230VAC and 115VAC. The unit
is housed in a plastic enclosure suitable for panel or surface mounting.
1.1.2 RECORDING
The unit incorporates a 10 inch circular chart. One box of standard charts is provided with
each unit. Charts are available in a wide selection of ranges. Chart rotation speed is
programmable from 0.1 to 999.9 hours per revolution in 0.1 hour increments. The instrument
can be provided with one or two pens. Pen 1 is red and Pen 2 is green. Pens are of the
disposable fiber-tip type. Changes in pens, as well as charts, are quickly and easily accom-
plished.
A programmable chart/display filter is provided. This filter provides adjustable dampening of
the value displayed and recorded. The filter need not be used. (Configured in program mode
as "dFF," Display Filter Factor.)
FIGURE 1-1
PEN 1 DISPLAY
Pen 1
Auto/Manual
Display
Key
Select Key
Pen 2
Auto/Manual
Key
PEN 2 DISPLAY
Keypad
Scroll Key
Up Key
Down Key
P 5
AGE