OHAUS CKW-55 Instruction Manual

Also see for CKW Series: Quick start guide Installation and operation instructions

Contents

OHAUS CKW-55 Instruction Manual Manual pdf 43 page image

CKW-55 CHECKWEIGHER EN-394. CARE AND MAINTENANCE4.1 CalibrationWhen the CKW-55 Indicator is initially set up to a base, it must be calibrated before use to ensure accurate weighing results.CKW Scale models are shipped pre-calibrated from the factory. However, many conditions may require that the scale berecalibrated. Temperature changes, geographic gravity variations and rough handling are few reasons why a scale mayneed recalibration.Notes:1.Make sure that appropriate calibration masses are available before beginning calibration.2.Make sure that the scale is level and stable during the entire calibration process. The Indicator will retain previouslystored calibration data.3.Masses required to perform the procedures should be in compliance with the requirements of the scale base being usedwith the Indicator.4.Calibration is unavailable with LFT set to On.5.Allow the scale to warm up for approximately 5 minutes after stabilizing to room temperature.6.To abort calibration, press the TARE button anytime during the process.4.1.1 Span CalibrationSpan Calibration uses two points to adjust the scale. One point is called the zero value where there is no weight on thescale. The other point is the Span value that is often, but not necessarily, at full capacity. The CKW-55 Indicator allows theuser to select alternate Span calibration values. Span values closest to the full scale capacity are recommended to give thebest performance over the entire weighing range. Other Span values may be specified due to limited availability ofcalibration masses or for improved accuracy at a lower weight range. Before calibrating the scale, check that the weighingbase is correctly leveled. When any selection within the Read-GMP menu is enabled, calibration results are automaticallyprinted.Press and hold the G/N/TMenu button until MENU is displayed. When the G/N/TMenu buttonis released, CAL is displayed.With CAL displayed, press the Yes button, SPAN is displayed.Press the Yes button to select and perform Span Calibration.....The display flashes 0, indicating that nothing should be placed on the platform at this time.After ensuring that the scale platform is clear, press the Yes button. -C- is displayed while thezero point is established.