Varec 2920 Installation And Operation Manual page 84

2920 Float & Tape Transmitter
74
Display Only
Analog Status
Pnt Status
Value
Raw Value1
Elapse
Pnt CheckSum
Command
Command
Config Params
Avg Filter
Zero
Span
Cal. Point #1
Cal. Point #2
5 Display and Configuration Interface
Description
A value of 1 indicates the analog value is valid and
within range; a value of 0 indicates some the value is
out of range.
Point Status, as follows:
0x0001 - Hardware Failure
0x0002 - Value 1 Over range
0x0004 - Value 1 Under range
0x0008 - AI is uncalibrated
A value of 4-20 mA signal with the calibration correction
applied.
A value of 4-20 mA signal before calibration correction
is applied.
Time of last update.
CRC-16 Checksum of point's static configuration
parameters.
Calibration Command
The Analog Input value can be averaged over several
samples to improve stability of the measurement. The
filter can be set between 0 and 7.
Zero and Span together determine how the input value
is scaled. The Analog input measures a value between 0
and 22 mA. The measurement value in typically in the
range of 4 to 20 mA with 4 mA the minimum value and
20 mA the maximum value. (A 0 to 4 mA and 20 to 22
mA values are generally used to indicate a fault
condition.) If the 4 to 20 mA data came from a level
instrument with a range of 0 to 30 feet, the Zero
parameter would be set to 0 and the Span parameter
would be set to 30.0.
The Analog Input uses a two point calibration points:
Point # 1 is the Calibration Value for 8 mA.
Point #2 is the Calibration Value for 16 mA.
Installation and Operations Manual