Geotech 4-20mA Display User manual

Rev 4/3/2019 Part # 12050769
4-20mA Display
Installation and Operation Manual

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Table of Contents
DOCUMENTATION CONVENTIONS ................................................................... 2
Section 1: System Description........................................................................... 3
Function and Theory ......................................................................................... 3
Section 2: System Installation............................................................................ 4
Wiring the transducer ........................................................................................ 4
Setting Display Units ......................................................................................... 5
Section 3: System Operation.............................................................................. 9
Quick Start Guide.............................................................................................. 9
Section 4: System Maintenance......................................................................... 9
Section 5: System Troubleshooting ................................................................ 10
Section 6: System Specifications .................................................................... 11
Section 7: Parts and Accessories.................................................................... 11
The Warranty...................................................................................................... 13

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NOTE
DOCUMENTATION CONVENTIONS
This uses the following conventions to present information:
An exclamation point icon indicates a WARNING of a situation
or condition that could lead to personal injury or death. You
should not proceed until you read and thoroughly understand the
WARNING message.
WARNING
CAUTION
A raised hand icon indicates CAUTION information that relates to
a situation or condition that could lead to equipment malfunction
or damage. You should not proceed until you read and thoroughly
understand the CAUTION message.
A note icon indicates NOTE information. Notes provide additional
or supplementary information about an activity or concept.

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Section 1: System Description
Function and Theory
The Geotech 4-20mA Display is a display for 4-20mA sensors. Specifically designed for
harsh environments, the LED screen displays clear pressure or water level read outs while
the sensor is attached.
System Components
Power Switch
Display
AC Input
(Charging plug)
Battery Status
Signal Input
(Sensor Connection)
Enclosure

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Section 2: System Installation
Wiring the transducer
1. Open the connector.
2. Remove all internal components of the connector.
3. Slide the components separately over the cable.
4. Ensure 1/8” of the cable is past the rubber part of the strain relief.

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+ VDC
mA Signal Return
Ground/Shielding Wire
Figure 1-1
5. Wire cable to the connector using the following diagram
6. Completely re-assemble the connector.
7. Plug the 4-20mA transducer into the “4-20mA signal input”on the control panel
The transducer is now be ready to use with the 4-20mA Display.
The 4-20mA display comes pre-set from Geotech to operate with a 0-30 PSI transducer
and display PSI. If a different range is used (i.e. 0-50PSI) or you would like the display to
show water level, use the following steps to change the display.
Setting Display Units
1. Switch the ON/OFF switch to the ON position.
Screen should display a 0 value
EX 0.00; 0.01 etc.
2. Press the MENU key to enter Programming mode.
3. Press ACK key to access the Setup menu.
4. Press the ACK key to access the Input menu

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5. Select 4-20mA and press the ACK key to confirm the selection input.
This is the default option. If 4-20mA is not the default, press the MAX
key to scroll through the choices.
6. Press the ACK key to access the Decimal Point menu.
7. Select the decimal place by pressing the MAX key.
PSI decimal placement: ddd.d
FEET decimal placement: ddd.d
8. Press the ACK key to confirm input selection
9. Press the ACK key to enter the Program menu.
10. Press the ACK key to enter the Scale menu.

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11. Press the ACK to access the Input 1 menu.
This input represents 0% of the process variable.
The default value of 4.00mA should be sufficient for most applications.
12. Press the ACK key to accept.
13. Press the ACK key to access Display 1.
This is the value that will be displayed on the meter when the input is
4mA
The display will read “0” at this input.
14. Press the ACK key to enter Input 2.
The default input value of 20.00 for input 2 should be sufficient.
15. Press the ACK to accept this value.
16. Press the ACK key to enter Display 2.

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17. At this point it will be determined if the meter will display PSI or Feet.
If the meter is to display in PSI then set the display number to the max PSI
rating on the sensor using step #18.
Ex. For a 0-30psi sensor, set the display to 30.
If the meter is to display in Feet then determine the max depth by using the
following calculation:
FtMax= 2.31 x (Pressure rating)
EX: If a 0-15PSI sensor is being used, then the equation will be:
FtMax = 2.31 x 15
FtMax = 34.65ft
Set the display number to the calculated FtMax using step #18.
18. Enter the desired number in the Display 2 screen by pressing the RESET key
to select the digit (the selected digit is brighter than the others are). Press the
MAX key to increment the digits. Once the number is set, press the ACK key
to accept the input.
19. Press the MENU key to return to run mode.