Siemens SITRANS P Uživatelský manuál stáhnout pdf (Strana 125)

UMSITRPDS3-1 On-Line Operation

November 2010

6-27

6.4.13.2 Trimming the Upper Sensor Adjustment Point

A pressure representing the upper sensor pressure is applied and the transmitter is instructed to accept this

press. This corrects the characteristic slope; see Figure 6-4. Adjusting the upper sensor adjusting point

will not affect the lower sensor adjusting point. The upper point must be greater than the lower point.

1. Apply a reference pressure representing the lower sensor adjustment point.

2. In the Online menu, press 3 Device Setup.

3. In the Device Setup menu, press 2 Diagnostics/Service.

4. In the Diagnostics/Service menu, press 4 Trim.

5. In the Trim menu press, 2 Sensor Trim.

6. In the Sensor Trim menu, press 4 Upper Sensor Trim. A warning message will appear: “Loop should

be removed from automatic control.” Take the appropriate action and press OK to continue. A second

warning will appear: “This will affect sensor calibration.” Again, press OK to continue.

7. The “Apply hi pressure” message will appear. Press OK to continue. A “Pressure OK when pressure

is stable” message will appear. Press OK to continue.

8. The applied value is displayed next. The value can be changed from the Communicator’s keyboard.

Press ENTER to store the value or press ABORT to exit the procedure without storing a value.

9. Remove the reference pressure.

Output characteristic

Characteristic after lower sensor adjustment

Characteristic after upper sensor adjustment

FIGURE 6-4 Sensor Trim

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 221 222

Žádné komentáře

Siemens SITRANS P Uživatelský manuál Strana 125