SM flow meter | Programming

Common programming features

All of ifm's process sensors, including the SM series flow meters, use similar terminology for programming. We highlight the features used most often here. Refer to the Operating Instructions manual found under the "Downloads" tab at the product datasheet page for more details on these and other features.

Switching ouputs

• Hno -- hysteresis normally open: Output turns on when the set point (SP) is reached and stays on until the flow  rate drops below the reset point (rP)
• Hnc -- hysteresis normally closed: Output turns off when the set point (SP) is reached and stays off until the flow rate drops below the reset point (rP)
• Fno -- window normally open: Output turns on when flow rate is between the high limit (FH or SP) and low limit (FL or rP)
• Fnc -- window normally closed: Output turns off when flow rate is between the high limit (FH or SP) and low limit (FL or rP)

Analog outputs

• ASP -- analog start point:  The flow rate where the analog signal equals 4 mA (or O VDC in some models)
• AEP -- analog end point:  The flow rate where the analog signal equals 20 mA (or 10 VDC in some models)
• MAW -- initial value of the non-scaled measuring range
• MEW -- final value of the non-scaled measuring range

The chart shows how the analog signal and display information changes when the flow rate is above / below the scaled or non-scaled measuring ranges. This feature is useful in for your process control and troubleshooting issues.

The minimum scaled measuring range is available on the product datasheet.

Pulse output

• ImPS -- pulse value: The volume of flow required for each pulse
• ImPR -- repeating pulse: When set to yes, meter provides a pulse with each volume of flow specified by ImPS; when set to no, meter provides only a single pulse when the flow volume specified by ImPS is reached.

Pulse output vs. flow direction

• FPro = 0+: Pulses are counted only when the flow is in the positive direction (negative flow is ignored)
• FPro = -+: Pulses are counted in both flow directions. If flow is in the negative direction, an equal amount of flow in the positive direction must occur before the pulse output resumes. 

SM 2 / 9 with LED display

These SM flow meters monitor flow rate, temperature and total flow, but only display one of these process values at a time. Other display indications:

• LEDs 1...6 indicate selected units of measure for process values. 
• LEDs 7 and 8 indicate switching status of outputs
• 9: 4-digit alphanumeric display for indication of process values, parameters and parameter values
• 10: Enter button: Use to select parameter and confirm the setting
• 11: Up/down arrow buttons: Use to change parameter values. Remember to confirm setting by pressing Enter button.

General use of pushbuttons

The following illustrate the most common programming required for flow meter applications. Refer to the Operating Instructions manual found under the "Downloads" tab at the product datasheet page for more details on these and other features.

Scale the analog signal (output 2 only)

Setup totalizing function (output 1 only)

The video below shows how to set up the totalizer function on these SM meters.

Reset totalizer using ZH4217 external pushbutton

Note: This feature changes output 2 to an input; therefore, it cannot be used as an output.

Refer to FAQ #13 for details.

The totalizer will reset every time the pushbutton is pressed.