Vaisala HMP60 Betriebsanweisung PDF herunterladen (Seite 51)

Chapter 5 ______________________________________________________________ Maintenance

VAISALA _______________________________________________________________________ 49

Adjustment Procedure (HMP110)

NOTE

If you are adjusting a HMP110 or HMP110T probe that is in the analog

output mode, see section Terminal Application Settings for Probes in

Analog Mode on page 30 for instructions on how to start the probe in

RS-485 mode.

One-Point Adjustment of RH

Measurement (HMP110)

To perform a one-point adjustment to the capacitance measurement of

the HMP110 you need:

- The Vaisala USB cable (Vaisala order code: 219690)

- PC with a terminal application.

- One humidity reference. One-point calibration with a single

< 50 %RH reference will adjust the offset of the measurement. One-

point calibration with a single > 50 %RH reference will adjust the gain

of the measurement.

The procedure below uses the HMK15 Humidity Calibrator. LiCl salt

(11 %RH) is used as the reference point.

1. Connect the USB cable to the PC, but do not connect it to the probe

yet.

2. Insert the probe in the LiCl salt chamber of the humidity calibrator

(11 %RH).

3. Start a terminal application and set the correct connection settings.

The default serial settings are 19200 8 N 1. Remember to check

which COM port the USB cable is using.

4. Wait for 20 – 40 minutes for the humidity to stabilize.

5. Start the terminal session and connect the USB cable to the probe.

If your probe is in the analog output mode, you need to press Enter

a few times to start it in RS-485 mode.

6. Verify that the connection works by giving the ? command:

If the probe does not respond with device information:

- Disconnect the USB cable from the probe and retry. If your

probe is in the analog output mode, press Enter a few times

immediately after connecting the USB cable.

- Try the ?? command in case the probe is in POLL mode, open

the line using OPEN command if necessary.

- Check your serial line settings and cable connections.

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 65 66

Keine Kommentare

Vaisala HMP60 Betriebsanweisung Seite 51