Cameron NuFlo MC-II, User Manual

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MC-II Flow Analyzer
25
e. Substitute calculated values for variables in the formula to obtain the divisor.
Divisor
=
FC × Ps × Tf × CON
=
(Pg + Pa) × Ts × (Fpv)
2
72.56 × 14.73 × 509.67 × 35.31
(120 + 14.21) × 519.67 × (1.0102)
2
=
270.2462
f. Round the divisor to six digits (to accommodate the six-digit limit of the MC-II display). In this ex-
ample, the divisor to be entered into the MC-II is 270.246.
2. Refer to “Example: Liquid Measurement with User-Defined Units of Measure, Steps 2 through 9, pages
20 through 23, for instructions on entering the divisor and other calibration data into the MC-II.
Maintenance
Recalibration
For maximum accuracy, recalibrate the MC-II when installing a new rotor and vane kit in the companion
flowmeter, or when the MC-II is to be used with a flowmeter that has a different calibration factor. Changing
the calibration of an MC-II does not affect the flow totals accumulated at the time of the calibration. Rather,
additional flow, measured in accordance with the new calibration information, will be added to the existing total.
Battery Replacement
The battery used in the MC-II has a life expectancy of three to five years. This battery’s very flat discharge
curve makes it difficult to measure voltage to determine the remaining battery life at any point in time. Re-
cord the date of installation on the new battery for future reference in determining when it should be replaced.
To replace the battery, perform the following steps:
1. If the existing battery is still functional, press ENTER/STEP to store the current volume in nonvolatile
memory.
CAUTION: Before opening the enclosure, make sure the enclosure is in a well-ventilated area
and avoid breathing fumes that could be trapped inside. Under normal operating conditions,
the lithium battery that powers the MC-II is a sealed unit and poses no hazard when the enclo-
sure is opened. However, a leak in a lithium battery could expel toxic fumes into the enclosure.
If the battery appears to be damaged, adhere to the safety precautions and follow the disposal
instructions provided in Appendix C.
2. Loosen the eight captive screws around the outer edge on the back of the enclosure. The front plate of the
MC-II will fold down, hinging on the plastic retaining straps at the bottom of the enclosure. The battery
and circuit board should now be exposed for servicing.
Note— If necessary, use a thin screwdriver blade to pry the front plate free, but do not use excessive force.
3. Disconnect the old battery from the circuit assembly and remove the battery from the housing.
4. Mount the new battery in the housing, and connect it to the circuit assembly.
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