Casella CEL Sensus data logger unit - Manual (Page 40)

Programmable threshold
Programmable data value (0/1, -1/+l)
Instrument Channel:
The unit has a single channel available to accept digital data
(via RS-232) from external instruments, including CEL sound level
meters. (Other instruments on request, development fee).
Passive Channels:
Software derived channels, which hold values entered via the user
command interface.
Can record manual readings and values from external automated
equipment.
Note: The number of passive channels available depends on the number of
unassigned data channels.
Data Channels:
64 data channels under software control to read:
Analogue
Digital
Pulse counter
Frequency
Instrument
Passive
Other data channels
Alarms
Data channels allow further manipulation of the available data before
it is logged or displayed. Each channel includes:
Description (Free text, ‘Air temperature’)
Units (Free text, ‘Degrees C’)
Display format (How the number is represented) Signed, fixed width,
leading zeros.
Eight-term polynomial (For scale, offset and linearisation of raw data)
Y = C + M1 *X + M2*X^2 ...+ M7*X^7
Data process function: including minimum hold, maximum hold,
average, vector average.
Analog Outputs:
2 analogue outputs derived from PWM (pulse width modulation)
signals. Any of the data channels can act as a source for the output
value.
Output voltage (0 to 5 V)
Resolution (10-bit : 1 in 1024)
Update period (50 mS)
Specification
Page 40 of 44
SENSUS Digital Data Logger -
Users Handbook