Ronan X96S DENSITY GAGE Manuel d'utilisateur télécharger pdf (Page 52)

Density Gage Manual 012407

Single-Point Calibration Procedure

As an alternative, the single-point calibration can be used. In that case, the results of the first sampling procedure are used in

conjunction with a manually- calculated calibration constant where:

1 = 1 .

µT (0.2) (pipe I.D.)

(pipe diameter in inches)

The calculated result is entered into the system through the Calibrate Menu, Manual Entry Menu. In this alternate method, the

CALIBRATION module sequence is NOT used.

Temperature Compensation

If temperature compensation is required for your measurement accuracy, you will want to enable that feature before doing the

calibration.

WHY is Temperature Compensation Used?

Process temperature variation will cause a change in process density. If the change in density due to temperature variation is

significant, the measurement could be influenced. In those cases, temperature compensation is used to offset the influence.

WHEN is Temperature Compensation Needed?

In general, WIDE temperature variations over NARROW measurement spans usually require temperature compensation.

For example, a 25ºC change in process temperature over a measurement span of 0.6 SpG would NOT require temperature

compensation. However, a 25ºC change in process temperature over a measurement span of 0.1 SpG would require temperature

compensation.

As a rule-of-thumb, follow this guideline:

If your change in process temperature (in ºC) is greater than 50 times your density span, you will need to use temperature

compensation.

EXAMPLE:

IF: /\ T = 25º C

AND: Density Span = 0.6

THEN: 50 * 0.6= 30 > 25

THEREFORE:

Temp comp IS NOT needed.

HOWEVER:

IF: /\ T = 25º C

AND: Density Span = 0.1

THEN: 50 * 0.1= 5 < 25

THEREFORE:

Temp comp IS needed

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Ronan X96S DENSITY GAGE Manuel d'utilisateur Page 52