Plug-on digital display for adding a local indicator to a pressure or liquid level sensor with a 4-20mA or 0-10Vdc output.
- Display: 4 digit LED display, -1999 to +9999
- Power Supply: 6V drop for 4-20 mA loop signal, 8-36Vdc for 0-10V signal
- Electrical Connection: DIN, Binder or M12 connector
- Configuration: Front keypad buttons
- Dimensions: 47 x 47 x 68 mm (housing only)
- Special Features: 330 deg rotatable display and 300 deg rotation on connector, mix and match connectors
- Special Options: Intrinsically safe approval, PNP open collector contacts
The PA 430 is fully compatible with the DMP and DMK series of pressure transmitters and LMP/LMK series of liquid level transmitters with a DIN, M12 or Binder electrical connector. If necessary the PA-430 can be used to adapt one type of connector to another type since top and bottom connectors are independently specified.
This versatile add on local indicator can be easily retrofitted to an existing pressure transmitter by simply unplugging the transmitter and installing the PA430 between the existing plug and socket.
No extra power supply is required since the PA430 is powered by the sensor supply. The main consideration is to ensure there is sufficient supply to both the transmitter and the plug-on display.
The PA430 allows the user to switch electrical connection for input and output by mixing Binder, M12 electrical and DIN plug and socket connector types.
Options include ATEX IS approval for hazardous areas and 1 or 2 contact PNP switches for on/off process control function.
The readout can be pointed in any direction so that it can be installed without the need to re-position the transmitter.
Converting display readings
How do you adjust the data shown on digital display, e.g. we need it to show a pressure value?
The adjustments are made on the push buttons, for example, using the menu system you can easily scale the 4 and 20 mA values to represent your required engineering units.
Power supply requirements
What is the meaning of ‘no external power supply necessary’, does it have an internal battery installed?
For a 4-20mA version, the PA 430 is loop powered, this means that the power that is provided to the sensor for the 4-20mA current loop, will also be used to power the PA 430. The PA 430 is wired in series with the sensor and power supply unit (PSU). If you have a 0-10V version, then the PSU is wired in parallel.
How does the display mount on the sensor?
The display mounts directly onto the sensor, when selecting the PA430 you just need to match the type of input electrical connector on the PA430 to the one fitted to the pressure sensor.
Influence of display fault on sensor
Will the display affect the functionality of the sensor it is connected to, and is it possible that the sensor will stop functioning if the display fails?
The circuit is a series current loop and it passes through the electronics of the display, so it is possible that a circuit fault within the the display will cause signal failure. However the transmitter will still work if the PA430 is removed from the circuit. If the display fails somewhere else other than the series current loop, for example an LED failure, then the display will not interrupt the current loop signal.
What is meant by without contact, 1 contact and 2 contacts?
You can choose none, one or two programmable contacts. The contacts relate to on/off alarm fixed output switches, which can be configured by the user via the front panel buttons. The switches are PNP type and will output a portion of the supply voltage when switched on and off depending on the setpoints the user has pre-programmed.
Sensor operation without display
Is it necessary to use the PA430 display with a pressure transmitter for it to function or can the pressure transmitter work independently once connected to a signal conditioner?
The PA430 display is simply an add-on component, so it can be unplugged from the pressure transmitter removed from the current loop circuit if necessary without affecting the operation of the pressure transmitter.
Voltage used to power display
The supply voltage specified for the PA 430 is a little confusing. On the sensor I’m using it says 12-36V and on the display it says >= 6V. But when I then look inside the manual of the display, the minimum voltage is 6V and the maximum voltage is 6V as well?
The 6V drop is what the PA 430 uses, so you need to add that to the power supply budget along with what the sensor needs, which is 12V min. Assuming there is no other load in the circuit you will need at least 18Vdc for both devices to works.
So 24V should be fine to power the total current loop as long as you do not add any additional load that is greater than 300 ohms.
Specification data sheet
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