New features for F190 Multi Purpose Monitor

Fluidwell is constantly evaluating its products and continues to improve in quality and performance. Recently we’ve added several new features to the F190 Multi Purpose Monitor.

  • Hysteresis function, in addition to the single point which is used both as setpoint and resetpoint.
  • A clear alarm output function e.g. to silence an acoustic alarm.
  • Each alarm output can be activated in setup mode to test the wiring or performance of the alarm output.
  • Failsafe outputs
  • Pulsating outputs
  • Selectable alarm messages

Hysteresis function

Previously, the F190 only had a single point, the alarm-value, that is used both as a setpoint and a reset-point for the alarm status. With the new hysteresis function, the F190 offers adjustable set- and resetpoints, customers will be much more flexible in setting up their applications, e.g. pump-control functions.

Four hysteresis modes can be configured in the setup menu. With the chosen mode you can set a hysteresis for each of the 4 alarm values (LO-LO, LO, HI and HI-HI).

  • Disabled
    Setpoints are identical to resetpoints.

    (The behaviour is identical to HYSTERESIS = BALANCED and HYSTERESIS = UNBLANCED with the hysteresis set to 0.)
  • Balanced
    Setpoints and resetpoints are the setpoint values expanded up and down by half the hysteresis value.

    (If the user adjusts the setpoint value, the hysteresis remains intact and the set- and resetpoints move automatically.)
  • Unbalanced
    Setpoints and resetpoints are the setpoint values expanded upwards or downwards by the entire hysteresis value.

    (If the user adjusts the setpoint value, the hysteresis remains intact and the set- and resetpoints move automatically.)
  • Absolute
    Specific setpoints and resetpoints can be configured.

    (The setpoints can be configured at operator level and in the setup menu. The resetpoints can only be configured in the setup menu.)s

Clear alarm outputs

When an alarm is activated, any relay output that is configured to transmit that alarm status, will be activated. Sometimes, it is required to be able to silence the relay output but keep the alarm status. For this purpose, the ‘clear outputs’ function is introduced. Any relay output that has this function enabled will be disabled when the clear outputs action is executed. When a new alarm status occurs (e.g. a second alarm arises or the same alarm is triggered again) the relay output will be activated again.

The clear outputs action is executed at operator level, when level, height or percentage is shown, by pressing the CLEAR-key when an alarm status is present. The display will show a blinking text ‘CLEAR RELAYS’. When the operator presses the CLEAR-key again, the enabled alarm outputs will be cleared. When any other key is pressed or no key is pressed for 20 seconds, the display will return to normal operating mode without clearing the alarm outputs.

This procedure is equal to the ‘CLEAR TOTAL’ procedure in some of our flow rate indicators / totalizers. Note that there is no external contact available to clear the outputs (option IB is not available).

To clear the outputs by means of Modbus communication, an additional command is added to the command register.

Alarm output test

To be able to test the wiring and performance of the alarm output / mechanical relays, a test mode introduced. The test mode is enabled by selecting any other value than ‘disabled’ for in setup-menu 9.5: RELAYTST.
When enabled, the normal behavior of the relays is overruled and only the selected output is activated. When ‘all off’ is selected, all outputs are de-activated. The test mode can be left by simply selecting ‘disabled’, after which the normal function of the relay outputs is resumed. For extra protection, the test mode will also be disabled automatically when the unit returns to operator level or when the unit is restarted.

Fail-safe outputs

By default the alarm output is closed during an alarm condition. The new output behaviour setting has a fail-safe mode, where the control-signal becomes inverted. When power is lost, the state of the output will indicate an alarm is present.

Pulsating outputs

The new output behaviour setting also has a pulsating mode, where the output will send out a pulsating signal of 0.25Hz (2 sec on, 2 sec off) to allow a buzzer to be connected.

Selectable alarm messages

The F190 now facilitates a selectable alarm message on the display for each of the four alarm conditions. The displayed messages which can be chosen are: alarm, pump, ctrl, valve, level, relay, output and signal. This alarm message will be combined with the specific alarm condition, e.g. HI PUMP or LO-LO LEVEL.


We're happy to answer any questions about the improved F190, our products and services.
More info on the  F190 product page for technical specifications, datasheets and downloads
Or feel free to contact a Fluidwell expert: Sales support

News overview