KEY HT-300 User manual

INSTRUCTIONS
for
MODEL NO. HT-300/500
HARDNESS TESTER
VERSION 1.0
KEY INTERNATIONAL, INC.
480 ROUTE 9
ENGLISHTOWN, NJ 07726
Phone: [phone] Fax: [phone]

Key International, Inc. •Englishtown, NJ •U.S.A. Page 2
Table of Contents
General Description.....................................................................................................................................4
Introduction ..............................................................................................................................................4
Specifications ...........................................................................................................................................4
Method of Operation ................................................................................................................................5
Putting into Operation..................................................................................................................................5
Wiring.......................................................................................................................................................5
Inserting the Chart Paper..........................................................................................................................6
Operating Keyboard.....................................................................................................................................7
Operating controls....................................................................................................................................7
Power Button.........................................................................................................................................7
Restart Switch .......................................................................................................................................7
Stop Button............................................................................................................................................7
Start Button ...........................................................................................................................................7
Printer....................................................................................................................................................7
Adjustments .................................................................................................................................................8
Limit Switch.............................................................................................................................................8
Unit...........................................................................................................................................................8
Switch for units .....................................................................................................................................8
Adjustment................................................................................................................................................8
Starting the test program.......................................................................................................................8
Zero balance..........................................................................................................................................8
Calibration.............................................................................................................................................9
Explanation of error information..............................................................................................................9
CONNECTION POSSIBILITIES .............................................................................................................10

Hardness Tester •Model HT-300/500 •Version 1.0 Page 3
Connection of an external start-keY.......................................................................................................10
Connection to arallel-interface (94-00442) (OPTION).......................................................................10
Plug connections.....................................................................................................................................10
a) 5-pin socket:....................................................................................................................................10
Spare Parts List.......................................................................................................................................16

Key International, Inc. •Englishtown, NJ •U.S.A. Page 4
General Description
Introduction
The PTB 300 is a high performance hardness tester, which can accurately measure the tensile strength of
tablets, ampoules, food and other articles, either in single or in series operation. The tensile strength can
be printed out in Kilopond (Kp), Newton (N) or Strong Cobb (SC) units, according to the operator's
specifications.
Specifications
Sample Diameter 4 - 40 mm
Jaw Stroke 4 - 40 mm (externally adjustable)
Chart Speed 3 mm/second
Force Increase 2 Kp/second
Measuring Range HT-300: 0.5 - 30 Kp
HT-500: 0.8 - 50 Kp
, (convertable to Newtons (N), Kilo Ponds (Kp), or Strong
Cobbs (Sc) )
Measured Value Printed on the built in printer
Resolution 0.1 Kp
Accuracy +/- 1% Full Scale
Measuring Jaws Interchangable for different sample forms (tablets,
ampoules, etc...)
Dimensions (W) 530 mm x (D) 240 mm x (H) 180 mm
Power Supply Switch Selectable, 110/220 volt, 50/60 Hz., Single Phase
Input External Start Switch (optional)
Output RS-232 or BCD Parallel

Hardness Tester •Model HT-300/500 •Version 1.0 Page 5
Method of Operation
Figure 1: Method of Operation
After pressing the START-key, the zero-value of the load cell is teterminet ant aeoret in the
microprocessor. If the value is within the permittet range, the motor, controllet by the regulator-unit ant
the motor-amplifier, causes the plunger to move at a constant speed towarta the apecimen. As aeon aa
the plunger touches the specimen and protuces a force on the loat cell, the microprocessor switches the
regulator on 80 that a lineirly increasing force is producet via the control circuit (loaf
cell-regulator-motor-specimen) until the specimen breaks. The decreasing signal from the loat cell
indicates to the microprocessor, which subtracts from this value the zero-value (automatic zeropoint
correction) and prints out the calculated value in the desired units (N, kp, SC).
The spring-unit in front of the loat cell provites a smooth transition from the constant velocity phase of
the plunger to the linear power increase phase.
Putting into Operation
NOTE: Before putting the HT-300 into operation, check the voltage setting switch
on the back of the unit (220 V resp. 115 V) and make sure that the operating voltage
corresponds to the local power supply.
Wiring
•connect the signal cables to any additonal units
•connect the signal cable from the external start-key (if fitted)