Section 2 |
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HiFlow and LoFlow
The HiFlow and LoFlow menu cells allow you to enter maximum and minimum expected flow rates based on current operating conditions. Under normal circumstances, you should never need to change these settings. It is possible however, that a Controlotron customer service engineer may ask you to edit these settings during a support session. In such a case, a <Right Arrow> at the menu cell enables numeric entry.
Important Note: A caution on the use of upper and lower flow limits (used to prevent flow
tion) prior to using the Reversal Zero technique (Reversamatic): If the negative flow rate that the meter reads in the step during which the transducers are reversed is more negative than the lower flow limit, the meter will
Therefore, postpone the installation of upper and lower flow limits until the reversal zero procedure is executed successfully. For pipes that combine large diameters with very high flow velocities, it may be necessary to move the upper and lower flow limits out of the way until the reversal zero is completed. Moreover, pipes of this size frequently have excellent intrinsic zero performance and may not even need zeroing.
AnCal
This menu cell allows you to enter an artificial flow rate in current rate units that will drive the meter’s analog outputs, totalizer output and the screen shown below. You can use AnCal to check the analog outputs or as a reference source for calibrating external devices such as remote display screens or chart recorders and RTU’s. To test the Totalizer function, leave AnCal active for enough time for an accumulation to appear on the screen below. Moving the cursor from the menu cell cancels the AnCal function.
The M status is asserted due to the method used to simulate flow data.
| Siemens | Dual Path | SITE1 |
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| Flow Rate Simulation Control |
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| Flow GAL/MIN |
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| 120.00 |
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| Flow Vel F/S |
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| 4.23 |
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| Total GAL |
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| 5645.820 |
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| Vs m/s |
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| 1274.33 |
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| Signal mV |
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| 44 |
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| Valc % |
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| 57 |
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| Vaer % |
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| 13 |
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| Alarm Status |
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| AnCal GAL/MIN |
| > 120.000 |
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| HiFlow GAL/MIN |
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| 1577.9 |
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| LoFlow GAL/MIN |
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Flow Data
Note that the [Flow] menu cell immediately reflects the AnCal entry. Over time, the Total display will also increase.
To activate AnCal: |
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Move the cursor to the [AnCal ]menu cell by pressing | . Press | to enable numeric |
entry. Note that an equal sign (=) appears before the number. |
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Type the desired flow rate using current rate units (e.g., 120.00 GPM). Note that the [Flow] menu cell now reflects the artificial rate.
Move the cursor away from the menu cell by pressing 
to turn AnCal off.
