Summary of Contents for Grainger 4802
- Page 1 SCALE-TRONIX 4802 PEDIATRIC SCALE SECOND GENERATION WEIGHING SYSTEM OPERATING AND SERVICE MANUAL (SERIAL NUMBERS 21000 AND UP) NOW WITH DISPOSABLE DURACELL BATTERIES ECO-FRIENDLY DESIGN...
- Page 2 SPECIFICATIONS: 4802-PEDIATRIC SCALE UNIVERSAL POWER SUPPLY GENERAL Medical grade UL listed external power supply. SCALE-TRONIX® 4802 DIGITAL PEDIATRIC 100-240 VAC 50/60 Hz. SCALE: Completely self-contained scale; accurately Captive but replaceable line cord. weighs infants and toddlers. Six (6) “DURACELL” D size alkaline batteries. With The scale is contained in a portable, heavy-duty “LOW BATTERY”...
- Page 3 This User’s Manual is intended to provide all necessary information and data for the proper operation and service of the model 4802 PEDIATRIC SCALE with serial numbers 21000 and above. This manual should be studied before installing or placing the scale in service and kept in a safe, handy place for future reference.
- Page 4 ILLUSTRATION 1 Weighing cradle with length gauge. Heavy duty Stainless Steel Cabinet. Front panel with membrane pushbuttons Digital display Carrying handles Rear handle and cord holder Line cord, power supply, and plug (on rear panel).
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Page 5: General Description
Advanced Digital Signal The 4802 can be operated from AC line power and Processing (DSP) provides accurate data at all times. left on continuously for fast convenient weights; or it can be transported on a cart, operation from its Audible response by a series of beeps provides “D”... - Page 6 D. Easily detachable acrylic cradle with length gauge. Variety of cradle sizes/configurations available. E. Optional matching cart turns scale into a mobile weighting station. 1.20 ELECTRONIC FEATURES: A summary of the electronic features follows: A. Microcomputer equipped electronics with digital signal processing. B.
- Page 7 SECTION II ASSEMBLY – SET UP The SCALE-TRONIX® model 4802 PEDIATRIC removing the weight of the cradle and any SCALE is usually shipped with the scale and cradle in miscellaneous items left in the cradle. The display will show “0.000 KILOS” or “0 a single carton.
- Page 8 13. If the optional cart has been purchased follow features are contained within the software. the assembly instructions included with it. 2. Press the “Print/Send/Data” pushbutton. The model 4802 PEDIATRIC SCALE may The scale will display “dAtE” (date). Again then be mounted on it.
- Page 9 Setting this to “On” will allow display of the weight in kilograms with a display of “0.000”. model number of the scale will be displayed “4802”. This is provided as a reference aid Normal setting as shipped from the factory is “On”.
- Page 10 630-653-3377 for the manual that explains in detail the setting of these specific options for printer or computer connections. This (previous) option became a standard feature in 2013. 13. Press the “Print/Send/Data” pushbutton. The scale will display “PC brd” (printed circuit board).
- Page 11 “REWEIGH” will cause a new weighing The control panel of the SCALE-TRONIX® model 4802 PEDIATRIC SCALE is designed for operator cycle to start. convenience. A brief outline of the controls and features is provided below: 3.04...
- Page 12 An turned “on” or “off” by use of the “ON / (OFF) / ZERO” illustration of the cart with the model 4802 is shown pushbutton as described in section 3.01. The scale is on page 22.
- Page 13 “off”. Should the scale not read zero (“0.000 KILOS or “0 13. The SCALE-TRONIX® model 4802 POUNDS / 0.0 OUNCES”) when empty, PEDIATRIC SCALE allows for successive simply press the “ON / (OFF) / ZERO” weighing of patients. When the patient is pushbutton.
- Page 14 USA pounds are locked out in the field, one should cover DURACELL batteries is to weigh them (on the 4802 over the ‘KILOS/POUNDS” selection button to avoid or other accurate scale). A set of 6 batteries should confusion.
- Page 15 To keep your scale in top working order, the following preventative maintenance measures apply: 1. This scale contains no moving parts in the weighing portion, so recalibration should never be required. This is different from mechanical scales that require periodic calibration to compensate for mechanical wear.
- Page 16 100, and converted to a “ground-reference” voltage for further The load cell employed in the model 4802 is known processing. as a “Double Ended Bending Beam (“DEBB”). It is...
- Page 17 furnished by resistor R34 and capacitor C23. 4.23 ANALOG-TO-DIGITAL (A/D) CONVERSION Integrated circuit U6 is the analog-to-digital converter. Included on this integrated circuit are auto-zero functions, auto-polarity, and the digital and analog functions necessary to perform dual slope integration conversion to 20,000 counts (4-1/2 digits). weight signal voltage is applied to the analog input (pin 10) of U6.
- Page 18 Transistor Q1 is a series switch which applies battery 4.25.3 +9.5V/-7.5V SUPPLY voltage to the remainder of the circuitry. Q1 is controlled by transistor Z2, which in turn, is controlled Integrated circuit U2 is used to convert +5 Volts D.C. by “watchdog timer”...
- Page 19 Crystal XTAL1 and capacitors NOTE: Previous 4802 scales used rechargeable C29/C30 form the clock oscillator which controls the nickel cadmium batteries and had a front panel LED internal timing of the microcomputer.
- Page 20 Resistors R54/R55 are provided as pull-ups on the U1 and U3 automatically perform the multiplexing SCL/SDA lines to insure the data and clock pulses necessary to properly illuminate each LED digit. are properly shaped. Capacitor C36 improves power Once the correct segment data is loaded into U1/U3, supply bypassing.
- Page 21 Diodes D1 and D3 are used to turn the scale “on” 4.33 WEIGHT READING TAKES EXCESSIVE when either the front panel “ON / (OFF) / ZERO” or TIME TO DISPLAY the “RECALL PRIOR WEIGHT” pushbuttons are pressed. They connect the “ON” line present on the If the cradle is in motion, the scale will wait for it to expansion bus connector J1 to ground momentarily to settle before displaying the weight.
- Page 22 If only “pound” test weights are available, conversion when measured from its terminals. is as follows: 4.36 NON-FUNCTIONING KEY(S) 1.0 Pound = 0.454 Kilograms Check the front panel keyboard for visible signs of 5.0 Pounds = 2.268 Kilograms damage (punctures, dents, etc.). Check that 10.0 Pounds = 4.536 Kilograms keyboard tail with connector is properly inserted into...
- Page 23 analog-to-digital converter data being until the correct value is obtained. inputted to the microprocessor. If the display shows “Ad our” (A/D over range), try 6. Press the “Print/Send/Data” pushbutton one repeating the process with a single 10 kilogram more time. The number displayed is now the weight until the calibration becomes close;...
- Page 24 600059 Power supply mounting bracket 48217 Scales liners, carton of 500 40517 Power cord 48800-1 Mobile weighing cart for 4802 48859 Scale liner dispenser shelf for mobile 66011 Rubber foot with washer weighing cart 10-32 x ½” button head screw...
- Page 25 MODEL 4802 PEDIATRIC SCALE SHOWN ON OPTIONAL CART CART EQUIPPED WITH CRADLE LINER DISPENSER SCALE SHOWN WITH OPTIONAL 4-SIDED CRADLE...
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- Page 28 SECTION VI WARRANTY 6.00 WARRANTY THE MANUFACTURER warrants all scales to be free from defects in parts and workmanship. Its obligation under this warranty is limited to repairing or replacing an improperly operating unit, providing the scale has been under normal usage and service.