Table of Contents
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Table of Contents
Troubleshooting
Summary of Contents for GT GEM Series
- Page 1 GEM/GEM2 Installation, Operation, and Maintenance Manual...
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Page 2: Table Of Contents
GEM Series Flow Meter Table of Contents Safety Instructions ......................... 3 Flow Meter Specifications...................... 7 Meter Dimensions ............................. 8 Features ..............................9 Transportation ............................9 Storage ..............................9 Installation .......................... 10 Pressure Drop ............................10 Operating Range & Accuracy ........................10 Meter Positioning ........................... -
Page 3: Safety Instructions
GloTech Corporation Safety Instructions WARNING Personal Safety Throughout this manual and on all safety signs, the precautionary statements (“DANGER”, “WARNING”, “CAUTION” and “NOTICE”) can be found, followed by a hazard description and preventative actions to be taken. These precautions are intended for the personal safety of the operator and those within the vicinity of the machinery. - Page 4 GEM Series Flow Meter WARNING: All maintenance and service must be performed by authorized personnel. WARNING Disconnect Power Source: Do not connect source power to the flow meter until all installation operations are completed, all covers have been properly installed and all personnel are clear of the equipment.
- Page 5 GloTech Corporation WARNING Inspecting the System Prior to Operation: Always inspect the meter before operation. If the meter appears impaired, do not operate the meter and contact the product support team at 954-908-9955 | gemsupport@glotech-corp.com. CAUTION Proper Area Lighting: The owner shall provide area lighting as may be required. WARNING Repairing the Meter: In the event that the GEM flow meter needs to be repaired;...
- Page 6 GEM Series Flow Meter • When transporting, all packaging must have the proper warning labels clearly displayed on the outside of the containers. • Do not transport or operate batteries at temperatures beyond their specified range. • Do not crush, break, or disassemble the battery.
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Page 7: Flow Meter Specifications
GloTech Corporation Flow Meter Specifications 2", 3", 4", 6", 8", 10", 12", 14", 16", 18", 20", 24" (bigger sizes available Pipe Sizes upon request) Flange Size ANSI 150 (DIN and BS available upon request) Pressure Rating 290 psi Conductivity ≥ 10 µS/cm 14°F to 131°F (-10°C to 55°C) with a rubber liner Operating -4°F to 212°F (-20°C to 100°C) with a PTFE liner... -
Page 8: Meter Dimensions
GEM Series Flow Meter Meter Dimensions Nominal Weight in lbs (kg) Dia.* 2” 7.9 (200.7) 13.0 (330.2) 10.0 (254.0) 6.0 (152.4) 29 (13) 3” 9.1 (231.1) 14.6 (370.8) 10.8 (274.3) 7.5 (190.5) 41 (19) 4” 10.2 (259.1) 15.7 (398.8) 11.2 (284.5) 9.0 (228.6) -
Page 9: Features
GloTech Corporation Features Transportation During shipping or transporting of the flow meter, avoid exposing the meter to strong shock or vibrations or impact. Avoid scratching the liner inside the pipe. Storage If possible, store the meter in its unopened packaging until actual installation. Avoid storing the meter outdoors for an extended period of time. -
Page 10: Installation
GEM Series Flow Meter Installation Pressure Drop 2" 3" 4" 6" 8" 10" 12" Flow Velocity (ft/s) For flow coefficients of larger sizes, please contact us at 954-908-9955 or gemsupport@glotech-corp.com. Operating Range & Accuracy Measurement Range GPM (LPM) Accuracy Pipe... -
Page 11: Meter Positioning
GloTech Corporation Meter Positioning To ensure accurate flow measurement, great care should be taken to correctly position the GEM flow meter during installation. If meter electrodes are removed from the operating fluid during operation the meter will report a zero reading. Air bubbles and sediment in the pipe can cause inaccurate or false readings. -
Page 12: Straight Pipe Recommendations
GEM Series Flow Meter Straight Pipe Recommendations To achieve optimal meter accuracy and performance, it is necessary to provide sufficient lengths of straight pipe upstream and downstream from the GEM flow meter. Below are common examples of installation conditions and recommended minimum straight pipe lengths. These serve as general guidelines and do not cover all possible conditions or any specific local regulatory requirements. -
Page 13: Grounding
GloTech Corporation Grounding WARNING: Electrical Shock When installing GEM flow meters to a plastic pipeline, or when externally powered, it is very important to ground the meter to avoid electrical shock hazard. Failure to do so can result in electrocution. IMPORTANT! Use Proper Grounding Properly ground the flow meter per the following grounding instructions. -
Page 14: Chemical Injection Applications
GEM Series Flow Meter For plastic pipe installations, a grounding rod or other ground-to-earth connection must be installed. The diagram below is shown for illustration purposes only. Exact dimensions of grounding rod may need to be adjusted on a case-by-case basis for optimal results. -
Page 15: Wiring Gem Power / Output Cable
GloTech Corporation Wiring GEM Power / Output Cable IMPORTANT! External Power Source Needed for Analog/Digital Output External power is required for proportional and reliable signal output to the main control panel. • Never attempt to only wire the analog/digital output without using external power source. Yellow Purple Pink... -
Page 16: Wiring Configurations
GEM Series Flow Meter Wiring Configurations Analog (4-20mA) Digital (Pulse / frequency output) *Color convention consistent with IOM. **This drawing is for reference purposes only. Pull-up resistors might not be needed for some devices. 4611 Johnson Rd Suite #8 Tel: (954) 725-8740... -
Page 17: Commonly Used Telemetry/Display Devices
24” Modbus Registers The GEM series mag meter supports Modbus communication protocol that allows for the monitoring and configuration of basic meter parameters such as flow readings, units, alarms, etc. Notes: Modbus communication is designed for use when meter is externally powered. Running it on battery may significantly reduce the expected battery life. - Page 18 GEM Series Flow Meter Baud Rate Data Bit Stop Bit Parity Bit 2,400 Even 4,800 9,600* 14,400 19,200 * Default baud rate 2. The data frame / Application Data Unit (ADU) consists of address code (1 byte), function code (1 byte), data section (n byte), and CRC (Cyclic Redundancy Check) code (2 byte).
- Page 19 GloTech Corporation 7. Flow unit encoding: Instantaneous Flow Rate Unit Address Data Length Description Data Type Access (Byte) Instantaneous Flow Unit SHORT Read/Write 00: LPS 01: LPM 02: GPS 03: GPM 04: CFS 05: CFM 06: CMM 07: CMH 08: MGD 09: MLD 10: MI 11: BBL/min Totalized Flow Unit Address Data Length...
- Page 20 GEM Series Flow Meter 4. Forward Totalizer Decimal (FLOAT) Master broadcasts: Slave responses: CRC16L CRC16H 5. Forward Totalizer Unit (SHORT) Master broadcasts: Slave responses: CRC16L CRC16H 6. Reverse Totalizer Integer (LONG) Master broadcasts: Slave responses: CRC16L CRC16H 7. Reverse Totalizer Decimal (FLOAT)
- Page 21 GloTech Corporation 9. Empty Pipe Alarm (SHORT) Master broadcasts: Slave responses: CRC16L CRC16H 10. Meter Size* (FLOAT) Master broadcasts: Slave responses: CRC16L CRC16H *Meter size unit in millimeters (mm) Data Conversion Examples Convert D0, D1, D2, D3 data from hex to integers or floats. For example: A value of 1600 can be expressed as follows: 0x44,0xc8,0x00,0x00 - FLOAT •...
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Page 22: Operations
2. Install the app on the phone; the phone may need to be set to authorize application installation from unknown sources. a. Android devices: Make sure that under “settings" ->"Location", that "Use location" is enabled. The individual permission for the app may also need to be adjusted. - Page 23 The GEM uses a low power consumption dot The meter continuously monitors battery life. matrix LCD rate/ total display. The screen When the battery power is low, the battery cell displays two lines of information. The top line icon will show an empty battery. Battery shows the total flow accumulation.
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Page 24: Available Display Units
GEM Series Flow Meter When the job totalizer is enabled, the totalizer will switch between displaying the totalizer 5 seconds and the job totalizer for 10 seconds. Available Display Units Totalizer Flow Rate L, Lx1000, ML, GAL, GALX1000, MGAL, CM,... -
Page 25: Troubleshooting Guide
GloTech Corporation Troubleshooting Guide PCB & Battery Replacement IMPORTANT! Upon every battery pack replacement, replace the desiccant pack with a fresh pack included in the battery kit. Tools needed: • 1 x 4mm Allen wrench. • 1 x 3mm Philips screwdriver. Step-by-step instructions: 1. - Page 26 GEM Series Flow Meter 3. Once the display cover is removed, the LCD can be unplugged and unlatched from the battery cover. NOTE: If the purpose of disassembly is battery replacement, the LCD ONLY needs to be unplugged. 4. Use the 3mm Phillips screwdriver to remove the three (3) Phillips screws securing the battery cover to the meter.
- Page 27 GloTech Corporation 6. Remove the four (4) screws securing the PCB to the meter. In some cases, these screws may be a different color. Ensure that the four screws being removed are outside the white line traced around the PCB board. 7.
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Page 28: Troubleshooting Summary
GEM Series Flow Meter Troubleshooting Summary Problem Possible Cause Diagnostic Steps Solution Check battery voltage. A Replace battery pack. Refer to “PCB & Dead battery good battery will give a Battery Replacement” reading of ≥ 3.5V Screen timeout to conserve... -
Page 29: Accessories And Spare Parts
GloTech Corporation Accessories and Spare Parts Item Description GEMC15F 15 ft power/output cable GEMC25F 25 ft power/output cable GEMC50F 50 ft power/output cable GEMC100F 100 ft power/output cable GEMBT Spare / replacement battery kit GEMPB PCB replacement kit GEMUC Lid repair kit GEMDP Stub cable Revision Table...
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