Vaisala HMP260 SERIES Manual de servicio descargar pdf (Pagina 46)

HMP260 SERIES

Operating Manual HMP260-U017en-1.5

40 1997-11-25

6.1.1.3 Using LED commands

Disconnect the security lock jumper!

• Make sure that the sensors of the transmitter and the reference in-

strument are close to each other. Allow enough time for the sensor

heads to stabilize to the measurement conditions

• Connect an ammeter/voltmeter to the analogue outputs (connector

X2); if the outputs are already connected e.g. to a process computer

and you do not want to disconnect them, the current output can be

measured at separate test points located next to connector X15 (see

Chapter 7.5). Give command ¡¡¡l (see Chapter 5.2). At the first

calibration point the LED on the left flashes; adjust the humidity point

(offset) with the arrow switches to the reference value. One push of a

switch changes the output by 0.05 %RH; the change of the output

voltage or current depends on the output scaling. Press ENT switch.

The second LED from left starts flashing; press ENT again.

6.1.2 Two point calibration procedure

A two-point humidity calibration should be performed in stable conditions

using saturated salt solutions a reference.

NOTE.

If the humidity sensor has been changed, the calibration

has to be done according to the instructions in Chapter

6.1.3.

6.1.2.1 Using serial commands

Disconnect the security lock jumper!

• Leave the calibrator and the transmitter for at least 4 hours in the

same space so that their temperatures have time to equalize. Remove

the filter cap on the transmitter.

• Place the sensor head into the calibration hole of the LiCl bottle in the

humidity calibrator.

• Wait for 10 minutes.

• Give command CRH <cr> and enter the first point value and press

<cr>.

CRH <cr>

RH : xx.x Ref1 ? yy.y <cr>

Press any key when ready...

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 117 118

Sin comentarios

Vaisala HMP260 SERIES Manual de servicio Pagina 46