WEATHERPAK
®
EOC
Operations & Maintenance Manual
P/N: 0302-117-004 Rev. 0
7
Table 2-2 – AT/RH Sensor Specification Data
Operating Temperature Range
-30 °C to +60 °C
Measuring Range
0 to 100 %RH
Output Scale
0 ... 100 %RH equals 0 ... 1 VDC
RH Accuracy
+ 3%
Temp Accuracy
+ 0.6°C
2.4.3 Barometer (Optional)
The Barometer is housed in the WEATHERPAK
®
EOC. The data is sent to the ZENO
®
where it
is processed. The system uses atmospheric pressure and site-specific constants to compute
altimeter setting. The sensor is a versatile electronic barometer featuring high accuracy, low
power, wide operating temperature range with RS-232 serial data I/O. An accuracy of ±0.3 hPa
rms is maintained over the entire specified operating pressure and temperature range.
Table 2-3 – Barometer Specification Data
Operating Temperature Range
-40°C to +85°C
Operating Pressure Ranges
500 to 1200 hPa (mb)
Accuracy
+ 1mb at 22°C / + 3mb full range
2.5
WEATHERPAK
®
EOC
The WEATHERPAK
®
EOC consists of a ZENO
®
Datalogger, optional barometer, temperature
sensor, optional relative humidity sensor, compass, communications link, and power supply
circuitry in a sealed weatherproof enclosure. The WEATHERPAK
®
EOC sends control and
polling signals to the sensors and receives data signals from the sensors.
The compass automatically aligns to magnetic north. If placed laterally near a large mass of steel
or other magnetic material, an erroneous compass reading may result. (The top of a van is OK,
but next to it is not an ideal location). Try to place the WEATHERPAK
®
EOC at least 30 meters
laterally from large vans, busses, cranes, etc.
2.5.1 ZENO
®
The ZENO
®
accepts and stores sensor data from the AT/RH sensor, barometer and wind sensor. It
also checks alarms and control functions (diagnostic inputs) including ZENO
®
Datalogger power
monitor. Analog data are converted to serial digital data with low (12 bit, 10,000 samples/s, 2
channels maximum), high (15 bit, 10 samples/s), or ultra-high (18 bit, 2 samples/s) resolution.
The ZENO
®
Datalogger processes the sensor data in a 32-bit microcontroller and then sends the
processed sensor and other data in RS-232 serial format. The microcontroller allows extremely
