 Morehouse Digital Proving Ring

1.                  Exercise the Proving Ring and take readings to determine the tare load and record the Proving Ring temperature.
23.5O C                    Ring temperature

3.                  Determine net deflection for tare load.
98.125 div.             Net Ring deflection to calculate tare load at 23.5

4.                  Compensate net Ring deflection of tare load for temperature.
98.125 div.  Net Ring deflection to calculate tare load at 23.5
- 0.075 div.   Correction to 23 using the formula on page 17 of the Operation                            and Maintenance Instructions For Proving Rings manual.
98.1135 div.           Net Ring deflection to calculate tare weight at 23.5

98.1135 div.           Net Ring deflection to calculate tare load at 23

98.1135div. =  299.70 lbf interpolation from load table

98.1135 div. =  299.70 lbf force of tare load*

6.                  Exercise the Proving Ring and take readings for the applied load.
23.5O C                   Ring temperature

-        98.25 div.  Net Ring Deflection to calculate tare at 23.5
1006.8 div. Change in Net Ring deflection

9.                  Compensate net Ring deflection of load for temperature.
1006.80 div.             Net Ring deflection including tare at 23.5
-     0.13 div.  Change in Net Ring deflection
1006.67 div.  Net Ring Deflection Including Tare Load

The following is an example that uses a formula to correct for tare loads.  The tare load correction formula corrects for tare and is applied to the value of the applied load from the fitted curve data provided with your calibration report.  The tare load correction formula is represented as follows:       TCF =  (2c * L * T) - a

Where:      c = The value of the c constant found on the ring calibration report
L = The force of the load being applied
T = The force of the tare being applied
a  = The value of the a constant found on the ring calibration report

Calibration Report Data:   c = 0.2648421D-05
L = 3,000.00
T= 299.70 Lbf
a = 0.1673432D+00

TCF = (2*0.2648421D-05*3000*299.70)-0.1673432D+00
TCF =           4.595 div
3,000 LBF =   +1002.050 div. From table
1006.645 div. Correction for tare

# Difference between TCM and Tare Load Correction Using Computed Load Tables

TLC   =    1006.670 div.
TCM  =  -  1006.645 div.
Difference =          0.025  div.