Dickey-John GAC 2500 INTL, GAC 2500 UGMA Manual

ADDENDUM (GAC® 2500 UGMA/INTL)

MAINTENANCE

NOTE: For customers that require a more extensive cleaning procedure with debris buildup in the cell, contact and schedule your instrument for cleaning with your dealer or authorized service center.

This Addendum updates the Maintenance section of the GAC ® 2500

(UGMA & INTL) operator’s manual (11001-1505F and all other preceding manuals).

IMPORTANT: It is highly recommended the unit be regularly inspected and cleaned to ensure continued and consistent results.

For optimum performance, extensive cleaning should be performed weekly or more often based on surrounding environment conditions.

Factors such as dust, temperature extremes, grain dust, and external humidity vary from location to location. If there are any questions about the cleanliness or instrument performance, contact your local authorized service center.

Note: The following recommendations are provided as a guideline to maintain a robust and quality operating instrument. It should not be interpreted as an exhaustive maintenance program. Dust and debris may periodically accumulate in areas not specified in this manual. The owner is responsible for ensuring overall equipment cleanliness. If any questions arise regarding the maintenance or performance of the instrument, contact your dealer or local authorized service center.

EXTERNAL CLEANING

The LCD display may require periodic cleaning. Use a commercial cleaner for glass lenses to remove dust.

Do not apply water, organic solvent or chemicals, such as acid and alkali to the LCD display.

The GAC ® 2500 surface can be cleaned with any cleaner designed for plastic and stainless steel surfaces.

Periodically use a rag to wipe the grain hopper and the (2) upper grain hopper sensors.

Figure 1

Grain Hopper Sensors

Upper grain hopper sensors

GAC® 2500 Models (UGMA & INTL)

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INTERNAL CLEANING

Performing continuous tests can result in material accumulation around the critical internal components and adversely affect the measurement.

Two types of cleaning are recommended on an as needed basis:

• Daily clean

• Extensive clean

DAILY CLEAN METHOD

A daily clean method allows cleaning the cell and door using an automated process. During the cleaning sequence, the hopper door automatically opens. Instruments with version 2.4 grain handler firmware, the trap door opens automatically also.

To start the cleaning process:

1. At the Main Menu screen, press the Instrument Information button.

2. At the Instrument Information screen, press the Clean button.

– Pressing the Clean button automatically begins the cleaning sequence and opens the hopper door and the trap door (version 2.4 grain handler firmware).

Figure 2

Daily Clean Method

GAC2500-UGMA

Current User: Guest

Analyze Results Setup

Instrument Information GAC2500-UGMA

Cleaning Cell

Model: GAC2500

S/N

: 1807-00005

Software Version s: 4.2.0.0, 2.4, 2.2

IP Address : 169.254.0.37

Last Service

: 1/1/2014

NTEP COC: 10-038

Directive No: 9180.61 05-01-13

GAC2500-UGMA

Setting Instrument to Cleaning Mode

Please wait...

2 / MAINTENANCE GAC® 2500 Models (UGMA & INTL)

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3. Remove the grain drawer.

Figure 3

Remove Grain Drawer


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4. Using the supplied brush, manually remove any loose or stuck grain or dust from the measuring cell.

5. Press the OK button to return instrument to normal operation.

Hands should be clear from inside the instrument before pressing the OK button.

Figure 4

Cleaning Sequence

GAC2500-UGMA

Clean Cell and Press Ok when complete

Ok

GAC2500-UGMA

Returning System to Normal Operation

Please wait...

6. Insert grain drawer.

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NOTE: For customers that require a more extensive cleaning procedure with buildup in the cell, contact and schedule your instrument for cleaning with your dealer or authorized service center.

EXTENSIVE CLEANING METHOD

The daily cleaning method should be performed first before proceeding to the extensive cleaning method.

IMPORTANT:

Extensive cleaning should be performed weekly or more often based on surrounding environment conditions. Factors such as dust, temperature extremes, grain dust, and external humidity vary from location to location. If there are any questions about the cleanliness or instrument performance, contact your local authorized service center.

Tools required for internal mechanism cleaning:

• Brush p/n 206410003 (included with instrument)

Extensive cleaning of the instrument involves two steps to ensure optimum instrument performance:

1. Internal mechanism cleaning

2. Temperature sensor probe cleaning

To Clean the Instrument:

1. Power down the instrument.

Figure 5

Power Down

2. Unplug power cord.

Figure 6

Unplug Power Cord


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3. Remove other accessory cords (USB and printer).

Figure 7

Remove Accessory Cords

4. Remove grain drawer.

Figure 8

Remove Grain Drawer

5. Place the unit on its back side.

Figure 9

Place Unit on Back Side


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6. Manually pull down on trap door.

Figure 10

Pull Down on Trap Door

7. Clean surfaces around measurement cell including hinge, trap door, and edge of cell with the supplied brush.

Figure 11

Clean Surface Area Around Cell, Hinge, Trap Door, Edge of Cell

8. Close the trap door and clean hinge under trap door with brush.

Figure 12

Clean Under Trap Door

6 / MAINTENANCE

9. Proceed to instruction for cleaning the temperature sensor probe.


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CLEANING THE TEMPERATURE SENSOR PROBE

IMPORTANT: Any particles in front of the sensor’s optics can affect measurement performance. Therefore it is crucial to sufficiently clean the sensor. For excessive dust and/or foreign material buildup on or around the temperature sensor, it is recommended the instrument be returned to

DICKEY-john Service or authorized service center.

The temperature sensor may require cleaning due to dust buildup and/or foreign material that has collected around the sensor that could potentially cause temperature error readings during analysis. It is important the temperature sensor is visually inspected and cleaned each time a regular maintenance check of the instrument is conducted.

Tools required for cleaning the temperature sensor probe:

1. One of the below cotton swabs:

– Standard 6” long cotton swab (i.e. McMaster-Carr p/n 7074T12) for flush sensor

– 6” long, tapered tip cotton swab (i.e. McMaster-Carr p/n 71035T54) for embedded sensor

Figure 13

Recommended Cotton Swab for Flush Sensor

Figure 14

Recommended Cotton Swab for Embedded Sensor

2. 99% Isopropyl Alcohol

Figure 15

99% Isopropyl Alcohol


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3. 10” flat head screw driver (only for instruments with flush sensor/brush bracket)

Figure 16

10” Flat Head Screw Driver

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TEMPERATURE SENSOR TYPE

The GAC 2500 is equipped with one of two different sensor types. The cleaning method is similar for both types however the cotton swab for cleaning varies based on the sensor type.

• older instruments may include an embedded sensor on the circuit board (recommended cotton swab McMaster-Carr p/n 71035T54)

• newer instruments include a flush sensor on the circuit board and a brush bracket (recommended cotton swab McMaster-Carr p/n

7074T12 )

TEMPERATURE SENSOR LOCATION

With the instrument placed upside down and looking inside the instrument, the sensor probe is located in the middle of the instrument toward the top and front attached to a circuit board.

Figure 17

Sensor Probe Location

Enlarged view of flush sensor

Enlarged view of embedded sensor

OR

Brush and

Bracket

Assembly

(flush sensor)

[


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To Clean the IR Temperature Sensor:

1. Gently place instrument upside down.

Figure 18

Place Instrument Upside Down

2. Visually inspect the IR temperature sensor to determine the type of sensor installed.

3. For instruments with the flush sensor and brush bracket, the following procedure can be utilized to remove particles from the brush. Carefully place the head of the screw driver (10” length recommended) at the bristles and use a sweeping side-to-side motion through the entire length of the bristles no fewer than three times.

Figure 19

Cleaning the Brush Assembly


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4. Select the appropriate cotton swab as described. Wet one end of the cotton swab with 99% Isopropyl alcohol.

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Figure 20

Wet Swab with Alcohol

5. Swab method for cleaning sensor:

– For embedded sensors, the sensor is located inside the black tube.

Insert the swab inside the black tube and gently clean the IR temperature sensor with the wet end of the cotton swab as depicted in ( Figure 21 ).

– For flush sensors, gently clean the entire IR temperature sensor surface with the wet end of the cotton swab as depicted in

( Figure 21 ).

Figure 21

Magnified View of Proper Cleaning with Cotton Swab

Embedded sensor Flush sensor


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The IR temperature sensor can be cleaned with the Q-tip by placing the

Q-tip through the funnel or on the outside of the funnel as depicted in

( Figure 22 ).

Figure 22

Cleaning the Sensor with Cotton Swab

Funnel

Place Q-tip on either side of funnel to reach sensor


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6. Allow the temperature sensor to dry for 90 seconds then gently clean with the dry end of the cotton swab.

7. Visually inspect the temperature sensor as well as all other areas cleaned to ensure the instrument is free from debris. If there is any question about the cleanliness of the instrument, it should be returned to a dealer or authorized service center.

8. If cleaning is acceptable, return instrument to upright position and replace the drawer.

9. Reconnect power cable and accessory cords.

10. Power on instrument.

IMPORTANT: The foregoing recommendations are provided as a guideline to maintain a robust and quality operating

GAC 2500. It should not be interpreted as an exhaustive maintenance program. Dust and debris may periodically accumulate in areas not specified in this manual. The owner is responsible for ensuring overall equipment cleanliness. If any questions arise regarding the maintenance or performance of the instrument, contact your dealer or local authorized service center.

MAINTENANCE / 11



11001-1646A-201409

Dickey-John GAC 2500 INTL, GAC 2500 UGMA Manual

MAINTENANCE

EXTERNAL CLEANING

INTERNAL CLEANING

DAILY CLEAN METHOD

EXTENSIVE CLEANING METHOD

CLEANING THE TEMPERATURE SENSOR PROBE

Embedded sensor Flush sensor

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