Vaisala Oyj Humidity and Temperature Transmitter HMT335

Testing activates relays even if they are disabled.

Use the module push buttons to activate the relays. Press the REL 1 or REL 2 button to activate the corresponding relay.

Check if REL 1 button activates the relay (LED is lit)

Check if REL 2 button activates the relay (LED is lit)

Use the display/keypad to test the operation of relays.

Open the MAIN MENU by pressing any of the arrow buttons.

Select System, press the ►arrow button.

Select Diagnostics, press the ►arrow button.

Select Relay tests, press the ►arrow button.

Connect HMT330 to a calibrated current/voltage meter

Press the ADJ button to open the ADJUSTMENT MENU

Select Adjust analog outputs, press ► button

Select the output to be adjusted

Measure the first analog output value with a multimeter and enter the value

Measure the second analog output value with a multimeter and enter the value

Press OK to return to the adjustment menu

Press the ADJ button on the motherboard to open the ADJUSTMENT MENU

Wait for the probe to reach ambient temperature if using a warmed probe

Select ►Adjust T measurement, press ►key

Remove the filter from the probe and insert the probe into the reference temperature

Wait at least 30 minutes for the sensor to stabilize

Follow the stabilization from the GRAPH display

Is the transmitter within the accuracy specifications?

Select the method for calibration and adjustment

Perform calibration using the selected method

Was the calibration successful?

Document the calibration results

Remove the filter from the probe

Remove the damaged sensor and insert a new one

Attach a new filter on the probe

Select the method for Relative Humidity Adjustment

Perform calibration and adjustment using Display/Keypad

Perform calibration and adjustment using Serial Line