The WEIGHT CHANGE mode is used to monitor the patient's weight relative to ZERO.

1. Press the " WT CHG " button. The display will read" WT CHG=(patient weight)".

2. Press the "0.0 " button to set the relative zero.

Any variation in weight will now be viewed as a "+" or "-" figure relative to ZERO. Pressing the "WEIGHT" button will switch back to the WEIGHT MODE allowing you to view the patient's total weight again.
NOTE: When you reset the system zero, the WEIGHT CHANGE MODE will also be reset to zero.

FREEZE/RESUME

1. Press the " FREEZE/RESUME" button. The display will read " FREEZE = (patient weight) ".

2. Press the " FREEZE/RESUME" button. The display will read " FREEZE = (patient weight) ".

While in the FREEZE mode, the "WEIGHT" and "WT/CHG" keys will allow you to manually adjust the displayed weight reading in the event of a known error. Simply press the "WEIGHT" and "WT/CHG" keys to make the proper corrections.
NOTE: If FREEZE Mode is left unattended for morethan 3 minutes, display will read " LEFT IN FREEZE - REFER TO MANUAL". You must press the " FREEZE/RESUME" button to exit this mode.

If it becomes necessary to move the Bed and/or Patient while the scale system is active use the following procedure:

1. Press the " FREEZE/RESUME" button. The display will read " FREEZE = (patient weight) ".

2. Make all necessary adjustments to bed and/or patient.

3. Press the "FREEZE/RESUME" button once again to resume normal weight monitoring.

If it becomes necessary to remove the batteries while the scale is in use:

1. Note the displayed patient weight before removing batteries.
2. When the power is restored -
The display will toggle the message " POWER INTERUPTED" - "PRESS FREEZE".
4. Press the "FREEZE/RESUME" button to WAKE-UP the readout. If the weight reading is correct the system is
ready.
5. If the displayed reading is not correct:
a) Press the "FREEZE/RESUME" button. The display will read "FREEZE = (patient weight)"
b) Use the "WEIGHT" and "WT/CHG" keys to ramp the displayed value to the correct weight.
c) When done press the "FREEZE/RESUME" button once again to save the correction and exit to the normal
weighing mode. If you make a mistake, press "ON" to abort your changes.
IMPORTANT: IF YOU DO NOT KNOW THE CORRECT PATIENT WEIGHT YOU MUST
REMOVE THE PATIENT FROM THE BED AND RE-ZERO THE SYSTEM.

IMPORTANT : The following calibration procedure should only be performed by qualified service personnel. The 1229B load cell, itself, has no user serviceable components and should not be tampered with for any reason.
Recalibration is generally not required, but should be checked periodically to ensure accuracy.

INITIALIZATION and CALIBRATION PROCEDURE :
I. Initializing
Press and Hold the "Weight Mode", "Wt/Chg" and "On" Simultaneously.
The Display will read "Hold to Init" and count down from 9 to 0 (zero).
Release the buttons and the display should read "Initializing".
When display returns to normal the system is Initialized
II. Calibration
1. Press the"FREEZE/RESUME" button to enter the FREEZE MODE.
2. When the display indicates "FREEZE = (weight)", press and hold the "LB/KG" button. The display will
read "CAL" as the right hand digit counts down to enter the CAL MODE.
3. When in the CAL MODE, the Display must be connected to the Bed. A Number will appear on the right
side of the display. This number is the "Offset" of the bed. This number should be positive and between 40 and 100 Pounds with bed ready for patient (but no patient in the bed). On PCB1857C2, use R13 to adjust the Offset to proper range (+40 to 100 lbs). Then Press Zero.
4. Place a known weight on to the weighing surface and compare it to the displayed reading.
5. Use the "WEIGHT" and "WT/CHG" keys to make any necessary adjustments to the displayed value.
The displayed value should be within 0.1% of the calibrated weight plus or minus 1 digit of reading.
6. Press "FREEZE/RESUME" to save the changes or "ON" to abort changes.

CALIBRATION TOLERANCE TABLE

CLEANING and DISINFECTING:
The readout and transducer housings for the 1229B Scale System are made of aluminum and steel with a painted surface. You need only exercise caution when cleaning the display window as this is made of clear polyester . We recommend mild soap and water for general cleaning.