Vaisala HMT330 - Manual (Page 66)

User's Guide _______________________________________________________________________
64 ___________________________________________________________________ M210566EN-K
NOTE The WLAN interface is not recommended for use with the HMT331
fixed probe model (for wall-mounted applications). The HMT331 short
cable probe is designed to be used with the WLAN interface.
Attaching the WLAN Antenna
The WLAN interface module must be installed at the factory (when
ordering the transmitter), or by a Vaisala Service Center. Before taking
the transmitter into use, you must attach the antenna of the WLAN
interface into the RP-SMA connector on the transmitter cover. The
location of the antenna is shown in Figure 83 on page 181.
Data Logger Module
The optional data logger module extends the data storage for the
measurement data. When the data logger is present, this storage is
automatically used by the transmitter. The stored data can be browsed
using the optional display module, and accessed through the serial
connections. See sections Graphic History on page 68 and Data
Recording on page 116.
The data logger module contains non-volatile flash memory providing
4
years and 5 months of storage for 4 parameters at a 10-second sampling
interval. When the memory is full, the data recording will not stop.
Instead, the oldest data is overwritten. For each parameter and
observation period, the module stores the minimum and maximum values
during the interval, as well a data trend value that is averaged from
samples taken during the interval (see Table 9 on page 64).
Table 9 Observation Periods and Resolution
Observation Period Period for Trend/Max/Min
Calculations (Resolution)
20 minutes 10 seconds
3 hours 90 seconds
1 day 12 minutes
10 days 2 hours
2 months 12 hours
1 year 3 days
4 years 12 days
The quantities that are logged are the same that have been selected for
measurement using the display/keypad or the serial line. When taking the
transmitter into use, verify that the desired quantities are selected. If you
change the quantities later, the transmitter will start logging the new
quantities, and stop logging the quantities that are no longer selected.
Changing the quantities does not delete any measurement data that is