Figure 18: set point actions, Figure 18: set point actions 24 – Badger Meter Model IOG User Manual

Page 24

If the current setting requires a change, press the

► arrow button to advance to the first digit of the desired set point

value Once the correct place is reached use the

▲ arrow button to increment the digit until it matches the first number

of the desired set point Use the

► arrow button to advance to the next digit of the desired set point value then use the

▲ arrow button, increment the display digit until it matches the next digit of the desired set point Repeat this step for

the all the digits of the set point and then press the ENTER button once to save the new set point and advance to the

next parameter

Hysteresis 1 (HystSP1)

Extended Function (Advanced Version Only)

Hysteresis is used to modify how the output transistor reacts around a set point by taking recent history into account

Hysteresis prevents an output from turning on and off rapidly when the programed flow rate is at or very near the

set point
For example, a low flow alarm is set to activate when the flow falls below a pre programed point When the flow is

reduced to the set point, even minute changes of flow above the set point turns the output off disabling the alarm

Without hysteresis, if the flow rate fluctuates slightly above and below the set point the output rapidly cycles between on

and off states
Another example is a thermostat controlling a heater The thermostat turns the heater on when the temperature drops

below “A” degrees, but won’t turn it off until the temperature rises above “B” degrees The temperature between “A” and

“B” is know as the hysteresis Thus the on/off output of the thermostat to the heater when the temperature is between “A”

and “B” depends on the “history” of the temperature This prevents rapid switching on and off as the temperature drifts

around the set point
Refer to the graphical representation of the hysteresis setting as shown in

Figure 18

. The hysteresis value is set using the

same units as the rate units are entered
At the hysteresis HystSP1 prompt, press the ENTER button once The most significant digit of the current setting begins to

flash If the current setting is correct, press the ENTER button to advance to the next parameter
If the current setting requires a change, press the

► arrow button to advance to the first digit of the desired hysteresis

value Once the correct place is reached use the

▲ arrow button to increment the digit until it matches the first number

of the desired hysteresis Use the

► arrow button to advance to the next digit of the desired hysteresis value then use

the

▲ arrow button, increment the display digit until it matches the next digit of the desired hysteresis Repeat this step

for the all the digits of the hysteresis and then press the ENTER button once to save the new hysteresis and advance to

the next parameter

Minimum

Flow

Maximum

Flow

Output ON

OFF S

etpoin

ON S

etpoin

Hysteresis

Output OFF

Figure 18: Set point actions

NOTE:

Neither the set point nor the hysteresis values are checked against the maximum flow rate 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

ER-500 Flow Monitor

Page 24

August 2013