Chart
Recorder
The OFITE Recording Calcimeter differs from the pressure gauge model
only in that a pressure transducer and small strip chart recorder are provid-
ed to replace the pressure gauge. It is highly recommended that you care-
fully read the instruction manual for the chart recorder before attempting to
use the equipment.
The unit is a Love Controls 1200 series Minigraph Recorder. It uses an
“inkless writing system”, which uses a metal stylus to tap a dotted line on
pressure sensitive chart paper. It has been adapted for use with the
Calcimeter by adding a pressure transducer and power supply. The unit
will record the pressure changes within the reactor cell as they occur. The
percentage of calcium carbonate and dolomite can be calculated by apply-
ing the calibration factor to the chart reading.
The transducer in the chart recorder has a range from 0 to 15 PSI.
However, the chart readings represent milliamperes, not pressure. In order
to convert the reading to PSI, figure the percentage of full scale that is
being displayed. Then multiply that percentage by 15. This will give you
the PSI reading.
The chart paper included with the recorder shows 10 large divisions. If the
chart paper shows a value on the third division (30% of full scale), the pres-
sure reading is 4.5 PSI (15 PSI × .3 = 4.5).
There are two methods for installing chart paper. The Reroll method routes
the chart onto a roller for storage and review at a later time. The Feed
Through method routes the chart upwards through the top of the door so
that it may be viewed easily during recording. OFITE recommends using
the Feed Through method.
1. Remove all signal and power inputs to the instrument before chang-
ing the chart paper.
2. Press down on the door release latch and carefully swing the door
downward.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com
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Door Release Latch
