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38 Micro Motion 7827 Digital Viscosity Meter
Electrical Connections
Electrical checks
Measure the current consumption and the supply voltage at the meter amplifier. They should be
within the following limits:
• Current: 40 mA to 70 mA (Measured in series at the “SUPPLY +” terminal)
• Voltage: 22.8 V to 25.2 V (Measured between” SUPPLY +” and “SUPPLY -” terminals)
Functionality checks
1. When the meter is powered up, a small audible continuous ringing sound can be heard with a
“Ping” occurring at 1 second intervals.
2. With the meter clean and dry, and with the tines shielded from the wind, operate it in air and
check that the meter frequency output (τ
B
), is as specified on the meter calibration certificate
density air point check. If the ambient conditions are not at 20°C (±2°C), use the formula
below to calculate the resulting time period:
•t
B
@ 20°C = t
B
@ ambient temp – [ 0.11 * ( ambient temp - 20 ) ]
The result (τ
B
) from this equation should now correspond to the air check on the calibration
certificate to within ±0.5 μsec.
Note: The air check point is found in the Density Calibration section of the Viscometer calibration
certificate.
The τ
B
value can be easily monitored by a 795x computer with the “Health Check” facility.
Perform the following 795x front panel keyboard sequence if this facility is required:
a. Press the bottom-right grey MAIN MENU key.
b. Use the DOWN-ARROW key (at the left of the display) to page down through the menu
options until “Health Check” (or similar) appears.
c. Select the “Health check” option using the appropriate blue key at the right side of the
display.
d. Use the blue DOWN-ARROW key (at the left side) to page down through the menu
options until “Time period inputs” (or similar) appears.
e. Select the relevant “Time Period i/p 2”, “Time Period i/p 3” or “Time Period i/p 4” option
according to the physical connections made to the 795x (as advised in Section 4.6).
f. Refer to the supplied 795x operating manual for information about front panel key
operations and navigating the menu structure.