Liquid Controls Sponsler T675 - Cryogenic System Register - Manual (Page 40)

Sponsler, Inc. Model T675 Flow Totalizer Technical Information Pg. 37
4.5 FIELD CALIBRATION:
Field calibration to adjust a Kfactor that shifted due to the influences of the installation is only practical when the T675 is
programmed to use the Average Kfactor for calculating the delivery total.
4.5.1 Methods
There are numerous calibration procedures that are widely practiced. This discussion will be confined to 2; a
calibration prover and the weigh scale. The metrologically preferred method is the prover due to superior
accuracy. The scale offers an approximation and should be conducted with large volumes to minimize the error
introduced by the magnitude of the scale graduations. Another consideration when using a scale is to place the
receiving vessel on the scale. For either method the T675 should be placed in the Prove mode. Depress the
Setup key, enter the passcode when prompted, and depress Enter. The Prove mode format is a calibration
convenience allowing repeated access to adjust the Kfactor and overrides the cooldown timer and flow inhibit of
the reset and Kfactor function.
4.5.2 Calculating a new Kfactor
Calculating the new Kfactor is the same regardless of the calibration method employed. Although the SP1200
Flow Calibration Prover calculates the new Kfactor not all competitive systems offer this convenience. A simple
formula calculates the new Kfactor.
Note: Always insure that the engineering units of both the T675 and the calibration method are the same
by using the appropriate liquid equivalencies.
nTotal Calibratio
ctor presentKfa total T
NewFactor
* 675
=
Example: Calibration total = 50,000 lbs., T675 total = 45,000 lbs., present Kfactor = 150
135
000 , 50
150 * 000 , 45 * 675
= = =
nTotal Calibratio
ctor presentKfa total T
NewFactor
Example: Calibration total = 50,000 lbs. LAR, T675 total = 3873 gals, present Kfactor = 150
Convert 50,000 lbs. LAR to gallons:
gal
gal
4303
/ # 62 . 11
000 , 50
=
01 . 135
4303
150 * 3873 * 675
= = =
nTotal Calibratio
ctor presentKfa total T
NewFactor
4.5.3 Installing a new Kfactor
Cut the lead seal wire and remove the Program Enable Module (PEM). With the T675 powered up normally,
depress Setup and if not already in Prove mode enter your passcode. Select Avg. Kfactor by depressing <1>.
Example: A new Kfactor is calculated to be 135.01; <135.01>
Depress to return to the Prover Display
To exit the Prove mode depress and hold the pushbutton until the T675 is Off, then turn the
unit back On.