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AMALGAMATED INSTRUMENT HH4-WT Operation And Instruction Manual

Hand held digital load cell/pressure meter
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Digital Load Cell/Pressure Meter
Operation and Instruction Manual
AMALGAMATED INSTRUMENT CO PTY LTD
Unit 5, 28 Leighton Place Hornsby
NSW 2077 Australia
HH4-WT
Hand Held
Telephone: +61 2 9476 2244
Facsimile: +61 2 9476 2902
ACN: 001 589 439
e-mail: sales@aicpl.com.au
Internet: www.aicpl.com.au

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Summary of Contents for AMALGAMATED INSTRUMENT HH4-WT

  • Page 1 HH4-WT Hand Held Digital Load Cell/Pressure Meter Operation and Instruction Manual AMALGAMATED INSTRUMENT CO PTY LTD ACN: 001 589 439 Unit 5, 28 Leighton Place Hornsby Telephone: +61 2 9476 2244 e-mail: sales@aicpl.com.au NSW 2077 Australia Facsimile: +61 2 9476 2902...

  • Page 2: Table Of Contents

    Table of Contents 1 Introduction 2 Electrical connections 3 Function tables - summary of setup functions 4 Explanation of functions 5 External memory 6 Serial communications 7 Specifications 8 Guarantee and service 2 of HH4WTMAN-3.4-0...

  • Page 3: Introduction

    The HH4 is suitable for measuring weight, pressure, force, torque etc. The input required by the HH4-WT is a 4 wire mV/V output type transducer. 5V excitation is provided for the transducer. Calibration, and set up functions are easily achieved via front pushbuttons.

  • Page 4: Electrical Connections

    Electrical connections Power for the HH4 is provided by a 9VDC (216) battery. The battery cover is located at the underside of the case. External connections to the HH4 are made via a 9 pin “D” male connector. The HH4 provides 5VDC excitation for the mV/V output transducer. Electrical connections are as shown below.

  • Page 5: Function Tables - Summary Of Setup Functions

    Function tables - summary of setup functions Functions in this first table are available in FUNC or CAL mode, see page 7. Display Function Range Default Your Ref/Page record CHNL CH1, CH2, Calibration memory selection CH3 or CH.A1 drnd 1 to 5000 Display rounding Unit 1 to 250...
  • Page 6 H.SEC 10 to 250 Timer for peak and display hold 4.18 function seconds bAUd 300, 600, 9600 Baud rate for serial 4.19 RAtE 1200, 2400, communications 4800, 9600, 19.2 or 38.4 PrtY NONE, EUEN NONE Parity for serial input 4.20 or Odd O.Put dISP, Cont,...

  • Page 7: Explanation Of Functions

    Explanation of functions The HH4 setup and calibration functions are configured through a push button sequence. Two levels of access are provided for setting up and calibrating namely:- FUNC mode (simple push button sequence) allows access to calibration channel selection, display rounding, decimal point and digital filter settings only.
  • Page 8 Explanation of Functions Calibration internal memory selection CHNL Display: CH1, CH2, CH3 or CH.A1 Range: Default Value: CH1 Selects one of the three possible calibration internal memories (CH1, CH2, CH3, also CH.A1 if the optional external memory chip is used - see chapter 4.24). The CHNL function allows the instrument to be calibrated to up to 3 different load cells and hold the calibration values in internal memory.
  • Page 9 for setting or altering an address is as follows. 1. The CHNL function must be set to either CH.A1 i.e. a memory device must be connected. 2. With the external memory device connected enter function mode and step through to the Unit function.
  • Page 10 Sample rate RAtE Display: 5, 10, 15, 20, 30, 40, 50, 60, 80 or 100 Range: Default Value: 10 Sample rate for ADC - Displays and sets the ADC sample rate from 5 to 100 samples per second. The faster sample rates can be utilised in features such as peak hold and peak/valley memory. User pushbutton function USER Display:...
  • Page 11 Print (Output serial string to printer etc.) - The RS232 serial communications must be enabled to use this function. With the USER function set to Prnt and the O.Put function set to POLL each time the User button is pressed the display value will be sent from the RS232 serial port in 8 bit ASCII format.
  • Page 12 14. Press the F button, the display will now read CAL End (indicating that calibration of the second point is complete). The display will now move to the next function. Two Point calibration graphs SCL2 CAL1 CAL2 SCL1 CAL1 CAL2 Input Input Setting CAL1...
  • Page 13 4.11 Alternative mV/V calibration method ECAL Display: -1.999 or 9.999 Range: Default Value: 1.000 This function provides an alternative calibration method to the CAL1 and CAL2 method of scaling, note that only one of these methods should be used. The ECAL method allows the known rated mV/V value of the load cell to be entered followed by the maximum capacity of the load cell in whatever measuring units are required.
  • Page 14 4.12 Calibration offset CAL OFSt Display: Range: Any display value Default Value: n/a Allows the instrument calibration to be offset by a single point value. This value is added or subtracted across equally the range of the instrument. This scaling method is used to correct for a constant error in the reading.
  • Page 15 4.14 Set zero reference point CAL ZERO Display: Range: Default Value: n/a This function allows the operator to clear the ZERO RNGE limit memory and select a zero reference point anywhere within the input range. The CAL ZERO function is provided to allow a zero reference for the ZERO RNGE function only and does not form part of the calibration scaling i.e.
  • Page 16 then the instrument will not automatically power down and must be switched off via the On Off pushbutton. 4.18 Timer for peak and display hold functions H.SEC Display: 10 to 250 seconds Range: Default Value: 10 This function set the operation time duration when peak hold or display hold is selected as the user button operation at the USER function.

  • Page 17: Error Messages

    4.22 Instrument address for optional serial communications Addr Display: 0 to 31 Range: Default Value: 0 Set unit address for polled (POLL) mode (0 to 31). The host computer or PLC may poll each unit in turn supplying the appropriate address. The unit address ranges from 0 to 31 (DEC) but is offset by 32 (DEC) to avoid clashing with ASCII special function characters (such as CR ).

  • Page 18: External Memory

    The external memory allows the HH4-WT to be used with many loadcells, each attached to individual memory chips, without the need to recalibrate every time the load cell is connected i.e.
  • Page 19 ECAL and ESCL values to the HH4-WT therefore the ECAL and ESCL values in the HH4-WT will be those of the last cell calibrated, not necessarily those of the cell connected. Do not view the ECAL and ESCL settings when external memory is connected unless you wish to recalibrate the load cell since the calibration slope information for these settings will be overwrite the calibration slope in the external memory chip.

  • Page 20: Serial Communications

    Serial communications DIP switch settings The RS232 communications can be enabled or disabled via a DIP switch SW7 located at the display end of the HH4 circuit board. Switch 3 of this DIP switch is used to switch the communications facility on or off...
  • Page 21 Electrical connections The diagram below shows the electrical connections for a HH4-WT with both serial and load cell connectors. This dual lead arrangement allows for a convenient connection to the load cell and RS232 serial port. Note: an adaptor may be required to allow connection directly to a serial port.
  • Page 22 Serial communications function settings and commands With the communications enabled the following extra functions will be seen, these function should be set to match the settings on the PC or other device which the HH4 is communicating with. bAud rAtE (set baud rate) Select from 300, 600, 1200, 2400, 4800, 9600, 19.2 or 38.4 baud.
  • Page 23 Poll commands - Host Controlled Transmit Mode: This mode requires a host computer or PLC to poll the instrument to obtain display or other information or reset various setpoint parameters. Communications software often known as a “ter- minal” program is required when using POLL mode. When polling the HH4 it is essential that the command characters are sent with less than a 10mS delay between them.
  • Page 24 Where: is Acknowledge (6 Dec, 06 Hex) S echo command received “S” (83 Dec, 53 Hex) A is the responding units address YYYY is the secondary display value in ASCII is a Carriage Return (13 Dec, 0D Hex) For NONE the primary and secondary display values will be identical. If tARE is used then the primary display value transmitted will be the live input value i.e.
  • Page 25 RS232 serial port and the HH4 O.Put function should be set to A.buS. The description below only applies to HH4-WT displays with Ht2.3 version software or above. With the PC software running go to View then Live Data then Tools then Settings, a window similar to the one below should appear.

  • Page 26: Specifications

    Specifications Technical specifications Input: Ratiometric 4 wire strain gauge. Input Sensitivity: 80Ω to more than 2000Ω Excitation: 5VDC Accuracy: Up to 0.005% of full scale for alarms and display, depending on sample rate etc., see resolution table which follows. Using and ESCL calibration method accuracy is 1% Sample rate: 5 to 100 sample per second, selectable.
  • Page 27 Resolution table Effective resolution (bits) for HH4-WT over full scale mV/V input Samples/sec. 0.5mV/V 1mV/V 2.5mV/V 5mV/V 10mV/V 25mV/V 50mV/V 100mV/V 15.5 16.5 17.5 18.5 19.5 20.5 20.5 15.5 16.5 17.5 18.5 19.0 19.0 19.0 15.5 16.5 17.5 18.5 18.5 19.0...

  • Page 28: Guarantee And Service

    Guarantee and service The product supplied with this manual is guaranteed against faulty workmanship for a period of two years from the date of dispatch. Our obligation assumed under this guarantee is limited to the replacement of parts which, by our examination, are proved to be defective and have not been misused, carelessly handled, de- faced or damaged due to incorrect installation.

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