This article applies to the following devices:

  • Field Gauge LC10 equipped with a pressure sensor.

Things you will need: 

  • A PC running Windows. 
  • FieldLab Desktop software version 1.24 (or later) installed on your PC. Download the latest version for free.
  • A Ralston Instruments Field Gauge with pressure sensor.
  • USB Cord, provided with your Field Gauge.
  • A pressure source that can generate enough pressure to take the Field Gauge to full span.
  • A reference pressure device that is (recommended) 4 times more accurate than the Field Gauge.

Connect the Field Gauge and reference to the same pressure source.


Power on the Field Gauge


Connect Field Gauge to a PC running FieldLab Desktop with the provided USB cord.


Select the Field Gauge you want to calibrate from the Devices screen.


On the Field Gauge Overview Screen, select the button titled "Recalibrate This Field Gauge".

Select Recalibrate This Field Gauge

On the Calibration Screen, select the button titled "Recalibrate This Field Gauge".


Select the pressure units you want to use for the calibration process.


Adjust the pressure until the REFERENCE reads exactly 0 psi.

If you can't adjust the pressure to make the reading on your reference device display the exact target point of 0.000, get it as close as you can and then manually enter the reading into the "Reference Reading" field.


Press the button titled "Log Reading"

FieldLab Desktop will automatically update the pressure reading on the Field Gauge via the USB connection, and will record it when you press the Log Reading button.


Select the button titled “Up Next, Mid Point”.


Apply pressure to bring the reference to the exact mid point pressure.

The pressure listed in the Reference Reading field is the exact target you should be aiming to make your reference device read. If you can't get the reference device to read that exact pressure displayed in the Reference Reading field, adjust pressure to get your reference device to read as close to the target pressure as you can, then manually enter the pressure your reference device is displaying into the Reference Reading field.


Select Log Reading once your reference is displaying the exact (or as close as you can get it to...) the target Mid Point pressure.


Select the button "Up Next, Full Span"


Adjust pressure until the REFERENCE device is displaying the target Full Span target pressure.

As with the previous target points, if you can't get your reference to display the exact target pressure; adjust pressure to get your reference device as close as possible to the target pressure. 

If your reference device is displaying a slightly different pressure than the listed target Full Span pressure, then manually enter the reading the reference displays into the Reference Reading field.


Select the Log Reading button once the reference device reads the exact (or close as possible to) Full Span target pressure.


Select the button "Make Adjustments"

When you click the Make Adjustments button, FieldLab Desktop will use the information provided to recalibrate the Field Gauge.


Set the Next Calibration Date


Save Changes so that the next calibration date will be recorded on your Field Gauge.


Select Exit to return to the overview screen for your Field Gauge.


You should now have a reliably calibrated Field Gauge until the next scheduled recalibration date.