822-1002-C01 datasheet(27/40 Pages) MAGNETROL

27 / 40 page

50-621 Kotron Sentinel Models 822, 832 and 842 RF Point Level Switches

2.5

Advanced Calibration

Use these procedures in conjunction with standard calibra-

tion procedures already observed.

2.5.1 Calibration with No Level Change

1. Single Point: Accomplished in Section 2.3.2, Program

Path 2 — Single Point procedure.

2.5.2 Tank Commissioning

Initial calibration in water (conductive medium) with final

use in a non-conducive medium. If final medium is also

conductive, no calibration change is necessary

2.5.2.1 Single Point

1. Water (commissioning medium): Follow standard calibra-

tion procedure.

2. Final Process Medium (non-conductive): In Single Point

program, change MDIA (media) from COND (conductive)

to NONC (non-conductive)

2.5.2.2 Multi-Point

NOTE: Proper probe choice is critical. If final medium is conductive

(i.e., dielectric is >10 or conductivity is >10 micro mho/cm),

any insulated probe may be utilized. If final medium is non-

conductive (i.e., dielectric is <10 or conductivity is <10 micro

mho/cm), an insulated stilling well probe must be utilized

(models 8XA-XAXB-XXX or 8XB-AAXB-XXX).

1. Water

a. Establish PRLO point (refer to Section 2.4.2, Program

Path 3 – Probe Calibration). With probe installed and

NO liquid in the vessel, enter PRLO point. This value

should equal the distance of the tip of the probe from

the bottom of the vessel, plus one inch.

b. Establish PRHI point (refer to Section 2.4.2, Program

Path 3 – Probe Calibration). Raise level of the commis-

sioning liquid (usually water) to the highest point

possible. Enter PRHI point.

c. Complete relay calibration (refer to Section 2.4.2,

Program Path 3 – Probe Calibration).

2. Final Process Medium

With commissioning liquid removed and final process

medium in the vessel, reestablish PRHI point (for best

results at least 25% of the probe should be immersed).

Relay control parameters are now calibrated to the new

process medium.

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