Vaisala PTU200 Series User's Guide download pdf (Page 35)

CHAPTER 6_______________________________________________ CALIBRATION AND ADJUSTMENT

VAISALA _________________________________________________________________________ 31

CHAPTER 6 CALIBRATION AND

ADJUSTMENT

Pressure

The user can select a simple offset or a two-point offset and gain

adjustment and use the LCI command for adjustment of pressure

transducer. The MPCI command is used for the more sophisticated

multipoint correction capability at up to eight pressure levels.

Check first what linear corrections the transmitter is currently using

before attempt to readjust the transducer. As the previous linear

corrections will disappear when new linear corrections are input, the

user has to take into account the previous linear corrections when

deciding about the new ones.

NOTE

Entering new linear or multipoint corrections will always cancel the

previous corrections. It is advisable to write down the previous linear

and multipoint corrections so that they will not be lost by mistake.

Entering new linear or multipoint corrections or changing their status

will also automatically cancel the date of calibration of the

transmitter (see CALD command).

TABLE 6-1 Adjustment and calibration commands

Function Command

listing corrections CORR

linear corrections on/off LC ON/OFF

multipoint corrections on/off MPC ON/OFF

entering multipoint corrections MPCI

calibration date CALD

The linear and multipoint corrections are protected by switch SW4

(see figure 6.2). The switch SW4 is normally in write DISABLE

position (OFF) and the user must change it to write ENABLE position

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Vaisala PTU200 Series User's Guide Page 35