Invacare RPL450-1 Owners Manual - Page 56

11 ACCESSORIES  Should it be necessary to unlock the weight while the patient is still supported by the lift, the UNLOCK button may be pressed. The weight will unlock and the word "LOCK" will disappear from the display window. The weight value will then be updated. Once the weight becomes stable the weight can be locked again by pressing the LOCK button. Stable being defined as the weight fluctuating two tenths of a pound. For example, a patient weighing one hundred pounds, the scale will fluctuate between 99.8 and 100.2 until the LOCK key is pressed. Fluctuation of the weight displayed is normal as noted above. Press the LOCK button to lock the weight. The UNITS button can be pressed to toggle between units of pounds and kilograms. This is indicated by lb or kg appearing in the display window. 8. The lift may now be lowered and the sling removed from the patient.  The patient's weight will continue to be seen in the display window. The display will turn off automatically after a two minute period of nonuse [no changes in weight exceeding five pounds (two kilograms)]. You can NOT adjust the time delay for automatic shut off. After the display has turned off , the weight may be recalled by pressing the ON/OFF button. The unit can be turned off by pressing the ON/OFF button a second time. 11.4 Replacing the Battery  The scale is powered by a nine volt alkaline battery that should provide approximately 1500 readings before needing replacement. When battery replacement is needed, LO BAT will appear on the display. Perform the following: 1. Slide the battery door open in the direction of the arrow. 2. Remove existing battery. 3. Install the new battery. 4. Reinstall the battery door. Battery Door 9V Battery Arrow Assembled Scale Manual/Electric Portable Patient Lift 56 Part No. 1078987