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Gehaka G939 User Manual

Grain moisture meter
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User Manual
Grain moisture meter – model G939
Version: 1.00.000
Date: 08/2013

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Summary of Contents for Gehaka G939

  • Page 1 User Manual Grain moisture meter – model G939 Version: 1.00.000 Date: 08/2013...

  • Page 3: Table Of Contents

    G939 installation ........

  • Page 4: Introduction

    Introduction The G939 moisture meter includes all the characteristics to provide the most accurate grain moisture reading. With a simple operation and without operator intervention, model G939 will provide moisture readings in a few seconds, for a wide variety of products.
  • Page 5 15 seconds and without the operator intervention, in a fully automatic way. Just select the product, pour the sample in the G939 hopper, until a “BEEP” is given, the G939 will load the sample, perform the measurement and automatically unload the sample.

  • Page 6: Description

    Switches ON/OFF the G939 meter. Operating with numerical setting multiplies by 10 the indicated value. Confirms function setting selection. RIGHT-HAND ARROW It displays the next function or increases the value of one scale interval. Grain Moisture Meter – Model G939...
  • Page 7 G939 operates between 90 and 240 VAC. CARRYING HANDLE Used for carrying the G939. Caution: before lifting the G939 remove the drawer, because due to the tilt it may fall down. RS232 SERIAL PORT CONNECTOR Data output for printer or PC.

  • Page 8: G939 Installation

    Open the packaging, checking the conditions of G939. Remove the equipment and check whether all its accessories are included. Place the G939 on a stable table, in order to ensure it will not move during the operation. Remove the adhesive tapes fastening the drawer and check whether it slides easily.

  • Page 9: Measuring - Moisture Measuring

    100%, and the sample excess shall be removed from the hopper. Within a few seconds, the G939 meter will display the value of product moisture. If the Right hand/Left hand keys are depressed, the G939 meter will display all the measurements made, namely: WHEAT MOIST.: 13.09%...
  • Page 10 When the G939 meter is showing the measurement results on the display and a new sample is poured into the hopper, the G939 meter will perform a new measurement, using the same configuration of the previous measurement. If the ESCAPE key is depressed, the MEASUREMENT option will be exited, returning to the MAIN menu.

  • Page 11: Diagram Of The Functions

    1.1 Diagram of the functions A diagram follows indicating all G939 meter functions and it will help to understand the operation. Grain Moisture Meter – Model G939...

  • Page 12: Configuration

    G939 meter. Now, we will describe each one of these functions. Note that the number shown before each function corresponds to the same shown in the G939 Menu, this way it is easier to identify in the manual where the explanation of each function is.

  • Page 13: Adjusting The Number Of Elements To Be Averaged

    Go to function “2.1 Date and Time Adjustment” and depress YES; Now use the Right hand/Left hand ARROWS to Increase or Decrease the value of the TIME. When the value is right, depress YES and the G939 will go to the next field to be adjusted;...

  • Page 14: Adjusting The Number Of Decimal Digits

    Go to function “2.3 Adjusting the Number of Decimal Digits”, and depress YES; Now use the Right hand/Left hand ARROWS to increase or decrease the number Decimal Digits. This adjustment is limited between 1 and 2 decimal digits; Depress YES to complete the adjustment. Grain Moisture Meter – Model G939...

  • Page 15: Adjusting The Print Mode

    In this mode, measurement data in a report format will be sent, as stated below, through the serial port RS232. If the G939 meter has a built-in thermal printer, this report will be printed and simultaneously sent through the serial port RS232.
  • Page 16 1. Go to “Configuration” and depress YES; you have to put the Hard Lock in the serial output; Go to function “2.4 Adjusting Print Mode”, depress YES; Use Right hand/Left hand ARROW keys to select between the two printing modes, Printer or Computer; Depress YES to complete the adjustment. Grain Moisture Meter – Model G939...

  • Page 17: Adjusting Number Of Report Copies

    2.6 Adjusting the contrast This function allows adjusting the contrast of the LCD display. This value can be adjusted between 55% and 100%, and 100% is the maximum contrast. This value will be stored in the G939 memory. To adjust the Contrast: 1.

  • Page 18: Unlocking Chamber Door

    Go to function “2.6 Unlocking Chamber Door”, and depress YES; Use the LEFT HAND ARROW to open the door; the G939 will emit the typical noise of the Chamber Door opening; Disconnect the AC Cord from the G939 rear panel;...

  • Page 19: Uploading Internet Equation

    2.8 Uploading internet equation One great innovation of G939 is by the use of the Internet, performing a customization of the products the G939 will measure. All this information and the guidance to execute www.moisturetester.com.br. them may be accessed at...
  • Page 20 Creating new Equations. It is possible, starting from a “Universal Scale”, to create a new equation for a product the G939 does not have. Just set up a table with the readings of the Standard and those obtained in the G939 and in a few minutes you will create a new Equation and you will be able to install in the G939.

  • Page 21: Uploading Standard Equation

    How to exit “2.8 Uploading Internet Equation” function This function passes the control of the G939 processor to the computer to which it is connected. Once having entered in this function, we have only two alternatives to exit: Exit with the site commands;...

  • Page 22: Self-Report

    2.10 Self-report Makes a self-diagnosis of G939, and issues a report with all data. The Report will be sent to serial output RS232 or to the Thermal Printer built into G939. To get the report: Connect the G939; Go to “Configuration” and depress YES; you have to put the Hard Lock in the serial output;...
  • Page 23 Grain Moisture Meter – Model G939...

  • Page 24: Language Selection

    NOTE: After selected the language run the function 2.9 Uploading standard equations, to get the product names on the selected language. 3.1 RS232 Serial Port Set up the printer or the PC with which the G939 is connected with the following configurations: Serial RS232C Protocol: Baud Rate 4800 bps...
  • Page 25 In case G939 is not transmitting data and the PC is not receiving the information, observe the following items in your PC: Verify whether the system is selected to the COM port that is connected to G939. Verify whether the configuration of the PC Serial PORT is in accordance with the above indicatedProtocol;...

  • Page 26: Thermal Printer

    The Thermal Printer is an optional feature of G939. There are two options for installing the printer, one is built into the body of G939, which spares space and wiring, in addition to leave the RS232 Serial Port available for PC interconnection.

  • Page 27: Cleaning

    Chamber could be damaged. To open the door and performing the cleaning: Select “Configuration “ function; Go to function “2.6 Unlocking Chamber Door”; Grain Moisture Meter – Model G939...

  • Page 28: Error Messages

    Its operation is not affected by dust and the micro-controller is able to detect any failure, showing an error message on the display. In case of any failure, we recommend to return the G939 to Gehaka for the required meter repair and recalibration work.
  • Page 29 Service Department. Error 7 - Delta Temp. > 15ºC This error indicates that the temperature difference between the instrument and the sample is greater than 15 ºC. Wait for some minutes with the sample in the G939 drawer so this difference stays below 15 ºC. It is recommended that the sample temperature and instrument temperature shall be as close as possible, whenever possible. If the error persists, there was a failure in the instrument; send the instrument to Gehaka Service Department.
  • Page 30 Error 9 – High Sample Weight! After having the sample weight within the limits, a final verification is made after loading; if the amount of sample used is outside the limited that G939 is able to correct, this sample will be unloaded. Increase or reduce the amount of sample to correct the error. If the error persists, there was a failure in the instrument; send the instrument to Gehaka Service Department.

  • Page 31: Extreme Conditions

    Some of the involved facts are discussed below: We recommend that the product to be measured by the G939 shall be clean and free from impurities that could interfere in the moisture measurement. We should considered that, in the instrument calibration process with the oven, it was always used the product clean.

  • Page 32: Technical Specifications

    ±0.3 % related to oven in the scale range. Moisture Limits Depending on the product, see each one. Scale Range from 0 to 1.000 g Scale Interval 0.1 g Precision ±0.2 g Sample Weight Depending of each product. Grain Moisture Meter – Model G939...
  • Page 33 0.1 ºC Precision ±0.3 ºC Function Sample temperature automatic correction, within 2 - 15 seconds depending on the temperature difference between sample and G939. Correction range from 0º° to 50°C. Instrument Thermometer Operating Range from 0º to 100°C Scale Interval 0.1 ºC...
  • Page 34 Available scales in this version and operating ranges for each Product: Grain Moisture Meter – Model G939...

  • Page 35: Warranty

    The information in this manual is regarded correct until the date of its publication, as stated in the sales invoice of the product. Gehaka will not assume any liability resulting from the improper use or mal uses of this product, and also assumes no liability for non-observance of the information stated in this manual, and it reserves the right to modify it without previous notice.
  • Page 36 Notes...
  • Page 37 Notes...
  • Page 38 Notes...
  • Page 40 CA50 Moisture Tester IV2500 Infrared Moisture Analyzer IV3100 Infrared Moisture Analyzer BK Semi Analytical Balance Ind. e Com. Eletro Eletrônica Gehaka Ltda. Av. Duquesa de Goiás, 235 - 05686-900 São Paulo - SP - Brazil Phone: +55 11 2165 1100 sales@gehaka.com.br...

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