Metal Samples MS2500L, Руководство оператора

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3
Cycle Time Adjustment
The MS2500L uses a digital timing circuit which can be adjusted using three 10-position rotary switches
(Figure 2). The first switch represents tens of minutes, the second switch represents minutes, and the
third switch represents tenths of minutes. This allows user-selectable time cycles from 00.1 minutes to
99.9 minutes in 00.1 minute increments. The switches are located in the upper right hand corner.
C. Modes of Operation
An additional feature that is incorporated into the MS2500L transmitter is the ability to monitor and
transmit the corrosion potential of the cell. This a switch selectable function where the 4-20mA current
loop represents a corrosion potential of 1V positive or 250 mV negative full scale.
In either mode, LPR or OFFSET, the user can select two different modes of current loop response.
The first mode is the normal operation mode or SAMPLE mode. This mode is as the one described
earlier where the current loop information is updated upon the completion of a measurement cycle. This
is the logical choice of operation when taking LPR measurements where the current loop information
constantly represents the corrosion rate in mils per year. This mode of operation can also be used in
conjunction with electrode potential measurements where the corrosion potential can be sampled and
the current loop updated on intervals as set by the cycle time adjustment.
The second mode of operation is the TRACK mode. In this mode, the current loop output is updated
every 1.5 seconds. When taking corrosion potential measurements, this provides the user with a current
loop output that constantly tracks the cell corrosion potential. For LPR measurements, the current loop
will reflect the cell response to the applied current. This provides an excellent method for selecting the
cycle time for the normal mode of operation.
Figure 3. Front Board Figure 2. Back Board