3.4.4 Interface Calibration (cont.)
7. Establish interface level at desired 20 mA (100%)
level on the displacer.
8. Press the ENTER key. The ZERO LED will light.
Loop will go to 20 mA.
9. Press UP to lock in the 20 mA value. The ZERO
LED will go off. The SPAN LED will light. Loop
will go to 20 mA.
10. Press ENTER to confirm setting. The SPAN LED
will go off, and the loop will go to 20 mA.
3.4.4.2 Calibration in water only for interface of another liquid
over water.
The example calibration below assumes an upper specific
gravity of 0.80. For liquid with another S.G., immerse
displacer by the percentage equal to that S.G.
(EX: S.G. = 0.73, immerse displacer 73%)
1. Bring process up to operating temperature.
2. Establish water level at 80% level on displacer.
3. With unit power on, remove cover.
4. Press the ENTER key to start calibration. The
ZERO LED will light. Loop will go to 22 mA.
5. Press the DOWN key to lock in the 4 mA value.
The ZERO LED will flash and remain on. Loop will
stay at 22 mA.
6. Press ENTER to confirm the setting. The ZERO
LED will go off, and the loop will go to 4 mA.
7. Immerse displacer completely in water.
8. Press the ENTER key. The ZERO LED will light.
Loop will go to 20 mA.
9. Press UP to lock in the 20 mA value. The ZERO
LED will go off. The SPAN LED will light. Loop
will go to 20 mA.
10. Press ENTER to confirm setting. The SPAN LED
will go off, and the loop will go to 20 mA.
3.4.4.3 Calibration in water only for interface of two other liquids.
3.4.4.3.1
Lower S.G. less than or equal to 1.0.
When S.G. of lower liquid is less than or equal to
1.0, calibrate as follows (this example assumes upper
S.G. = 0.78 and lower S.G. = 0.98):
1. Bring process up to operating temperature.
2. Establish water at the point on displacer equal to the
upper S.G.
×
100% (EX. 0.78
×
100% = 78%).
3. Ensure there is no explosion hazard. With unit
power on, remove cover.
20
48-618 ES/EZ Modulevel Displacer Level Transmitter (Top Hat Assembly Design)
