Omega Engineering RD8900 DVR User Manual


 
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Log Speed: The logging speed (recording speed) of measured data, select Log Speed
column, then choose 1, 2, 5, 10, 30, 60 or 120 seconds.
Offset: It is offset value to correct the sensor error.
Gain: It is a multiplier to correct the sensor error.
The correct value = ( the process value + offset ) x gain
Input: Displays automatically the setup input of V, mV, mA, T/C ( J, K, T, E, B, R, S, N,
L ), PT100, JPT100
Unit: The engineering unit of input.
Range: Various input ranges can be set for voltage and current. Normally, it sets 0-1, 1-5,
0-5 or 0-10 V for the voltage, and set 0-20 or 4-20mA for the current.
Scale:
Scale Unit: Defines the scale unit.
Scale Low: Defines the low scale with decimal if necessary. For instance, input 0-10 V, the
Scale Low can be set up with value 0.00 to be correspondent to low range 0 V.
Scale Hi: Defines the high scale with decimal if necessary. For instance input 0-10 V, the
Scale Hi can be set up with value 100.00 to be correspondent to high range 10 V.
Event
The Event is frequently used for Alarm purpose. Event can also be used for digital output DO,
Timer, Totalizer, Counter or Report.
Type: There are various types of H, L, HH, LL, R or r to be selected for job or Alarm
purpose.
H: High limit. When the process is over high limit, the alarm or job is actuated.
L: Low limit. Any the process is lower than low limit, the alarm or job is actuated
HH: High high limit, to set up another limit higher than high limit for double warning.
LL: Low low limit, to set up another limit lower than low limit for double warning.
R: Increasing rate of change. The job or alarm is actuated when the rate of increasing
process value is greater than the specified rate time interval. For example, when the Setpoint
is set to 100_1S, if the process is increasing greater than the value 100 in 1 second, then job
or alarm will be actuated.
r: Decreasing rate of change. The job or alarm is actuated when the rate of decreasing
process value is greater than the specified rate time interval. For example, when the Setpoint
is set to 50_2S if the process is decreasing greater than the value 50 in 2 seconds, then job or
alarm is actuated.