Scientech HC Series - Manual (Page 11)

Specific Gravity Determination Without the Optional SCHSG Program:
1. Install a below balance weighing apparatus, such as a wire hook, including a pan suspended in a bowl of water. Insure that the
pan and the hanger do not touch any part of the bowl and all are totally submerged. Then tare the balance.
2. Place the sample to be tested on the balance pan and record the weight reading shown on the display. You may use any unit of
measure you desire.
3. Place the same sample to be tested on the pan suspended in the bowl of water. Make sure that the sample is completely
submerged in the water and record the weight reading shown on the display.
4. Subtract the reading in Step 3 from the reading in Step 2.
5. Divide the reading in Step 2 by the number calculated in Step 4. The result is the SG of your sample.
EXAMPLE: Reading in Step 2 = 6.50
Reading in Step 3 = 4.25
Subtraction = 2.25
Division (Step 5) = 6.50/2.25= 2.89 specific gravity
Options:
Optional RS-232 Printers:
Note: Printers must be serial.
Contact Scientech for available printers.
RS-232 Interface:
Your balance is equipped with a bi-directional RS-232 compatible interface. The interface is uni-directional (balance send only) when the
balance is connected to a serial printer and bi-directional when connected to a computer. The RS-232 connector is a 9 pin D subminiature
connector located on the balance rear panel. See Figure 3.
RS-232 Specifications:
Format 1200, 2400, 4800, and 9600 baud rate selectable
Code: ASCII
Parity is not considered
8 data bits, 1 start bit, 1 stop bit
Display Format First character Space or minus sign
Second thru ninth characters Displayed weight or pieces number
Tenth thru twelfth characters Unit of weight annunciator
Thirteenth character Carriage return
Fourteenth character Line feed
RS-232 Cable Requirements for Connecting to a Computer:
Figure 6 – Computer cable
RS-232 Cable Requirements for Connecting to a Serial Printer:
Figure 7 – Printer cable
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