Vaisala DMP248 Manual de servicio descargar pdf (Pagina 75)

CHAPTER 7____________________________________________________________MAINTENANCE

VAISALA _________________________________________________________________________ 69

Adjustment using serial commands

Give command CT and enter the first point value and press <cr>:

>CT <cr>

’C : xx.x Ref1 ? yy.y <cr>

Press any key when ready

Set the Pt 100 simulator at the highest temperature to be calibrated,

and press any key. Enter the second point (gain) reference reading. If

second reference is not needed, press <cr> to complete one point

offset correction.

Adjustment using display commands

Select &DOL in the main menu and then 7; select two-point calibration 7

 SRLQWFDO. Change the first point reading with the arrow keys and

press ENT.

Set the Pt 100 simulator at the highest temperature to be calibrated,

and adjust the second point (gain) to the reference reading.

Adjustment using LED commands

Connect an ammeter/voltmeter to the analogue outputs (connector

X2). Give command l, and adjust the first point (offset) with

the arrow switches to the same reading with the reference and press

ENT switch.

Set the Pt 100 simulator at the highest temperature to be calibrated,

and adjust the second point (gain) to the reference reading. If there is

no second reference, press ENT to complete one point offset

correction.

Disconnect the Pt 100 simulator and reconnect the Pt 100 wires to

solder lugs TP5, TP6 and TP7.

The correct connections according to the wire colours are:

TP5 TP6 TP7 TP8

blue green yellow black

If there is not a Pt 100 simulator available, the adjustment can be

made with two resistors of 84 Ω and 154 Ω whose resistance is known

precisely. Measure the resistor with a resistance meter. Look up the

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Vaisala DMP248 Manual de servicio Pagina 75