User guide

Programming Manual
Page 27 March 2014
Minimum
Flow
Maximum
Flow
Output ON
OFF Setpoint ON Setpoint
Hysteresis
Output OFF
Figure 26: Set point actions
OTE:N Neither the set point nor the hysteresis values are checked against the meter size to see if they are appropriate. Care
should be used when entering these values, especially in critical applications, as it is possible to enter inappropriate
values preventing the outputs from working as expected.
Trip SP 1 TripSP1
Extended Function
The trip parameter can be set for either High or Lo. When set to high the open collector transistor stops conducting and
sends the output high when the set point is reached. The output will not go low again until the flow rate falls below the
set point minus the hysteresis value. Similarly when set to low the, open collector transistor starts conducting sending the
output low when the set point is reached. The output will not go high again until the flow rate exceeds the set point plus the
hysteresis value.
For example if the set point is set to ten gpm, the hysteresis is set to two gpm and the trip set point is set to high (see Figure
27). When the flow goes above ten gpm the OC transistor stops conducting and the output goes high. The output stays high
until the flow rate drops below eight gpm which is the set point (ten gpm) minus the hysteresis (two gpm).
Minimum
Flow
Maximum
Flow
Output ON
OFF (8 gpm) Setpoint (10 gpm)
Hysteresis
(2 gpm)
Output OFF
Figure 27: Set point example
At the TripSP1 prompt, press ENTER. The tripping condition setting is displayed. If the current setting is correct, press ENTER
to advance to the next parameter.
If the current setting requires a change, press ► to advance to the alternate choice. Once the correct choice is displayed, press
ENTER to save the new trip condition and advance to the next parameter.