GE TRANSFIX DGA 500 User manual

GEDE-GA_M-DLIS-SR.MA-014 Rev 1.1 13-Oct-15
GE
Digital Energy
TRANSFIX™DGA 500
User Guide
Transformer Oil
Dissolved Gas and Moisture Monitor

Contents
1Introduction.................................................................................................................................... 4
1.1 Product Overview................................................................................................................... 4
1.2 Manual Scope......................................................................................................................... 4
2Safety.............................................................................................................................................. 5
2.1 Symbols .................................................................................................................................. 5
2.2 Warnings ................................................................................................................................ 5
2.3 Hazardous Substances.......................................................................................................... 6
3Technical Specification .................................................................................................................. 7
4Design Criteria................................................................................................................................ 8
5Power.............................................................................................................................................. 9
5.1 Introduction............................................................................................................................ 9
5.2 Cold Start ................................................................................................................................ 9
5.3 Battery .................................................................................................................................. 10
5.4 Power-Down Procedure ...................................................................................................... 11
6LCD Display Panel ........................................................................................................................ 12
6.1 LCD Information Notices...................................................................................................... 13
6.1.1 Startup .......................................................................................................................... 13
6.1.2 Manual Measurements................................................................................................ 14
6.1.3 Further System Specifications..................................................................................... 15
6.2 Error Codes........................................................................................................................... 17
7Manual Oil Sampling .................................................................................................................... 20
7.1 Sampling Arrangement........................................................................................................ 20
7.2 Sampling Process................................................................................................................. 21
8Air Filter Cleaning ......................................................................................................................... 22
9Oil Filter Cleaning ......................................................................................................................... 24
10 Communications...................................................................................................................... 25
11 Modbus Protocol ...................................................................................................................... 25
12 Service Logs.............................................................................................................................. 25
13 Technical Support .................................................................................................................... 25
Appendix A Time Sync Implementation.......................................................................................... 26
Contact details & Copyright statement .............................................................................................. 28

Table of Figures
Figure 5—1: DGA 500 (AC only) LED indicator lights & fuse holder ...................................................... 9
Figure 5—2: DGA 500 Universal Power Supply LED indicator lights & fuse holder............................. 9
Figure 5—3: Coin cell battery............................................................................................................... 10
Figure 5—4: Standby mode ................................................................................................................. 11
Figure 5—5: Operation mode............................................................................................................... 11
Figure 6—1: Inside view ....................................................................................................................... 12
Figure 6—2: LCD information notice –error format (top) & example (below) ................................... 12
Figure 6—3: Boot .................................................................................................................................. 13
Figure 6—4: Version ............................................................................................................................. 13
Figure 6—5: Standby mode ................................................................................................................. 13
Figure 6—6: Peripheral scheduler........................................................................................................ 14
Figure 6—7: Start a manual measurement ........................................................................................ 14
Figure 6—8: Stop a measurement....................................................................................................... 14
Figure 6—9: Measurement data.......................................................................................................... 15
Figure 6—10: Communication channels............................................................................................. 16
Figure 6—11: Networking .................................................................................................................... 16
Figure 6—12: GSM / GPRS modem...................................................................................................... 16
Figure 7—1: Manual sampling arrangement...................................................................................... 20
Figure 7—2: Product fitted with manual sampling arrangement...................................................... 20
Figure 7—3: PTFE tubing ...................................................................................................................... 20
Figure 7—4: Manual oil sampling process .......................................................................................... 21
Figure 8—1: Air filter ............................................................................................................................. 22
Figure 8—2: Product showing side hood ............................................................................................ 23
Figure 9—1: Oil filter ............................................................................................................................. 24
List of Tables
Table 3—1: Technical specification ....................................................................................................... 7
Table 4—1: Type tests ............................................................................................................................ 8
Table 5—1: External LED status indicators ........................................................................................... 9
Table 6—1: Errors ................................................................................................................................. 17
Table A—1: Timing................................................................................................................................ 26
Table A—2: UNIX time registers........................................................................................................... 26
Table A—3: Access flags....................................................................................................................... 27
Table A—4: Modifier flags..................................................................................................................... 27

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 4 of 28
1INTRODUCTION
1.1 Product Overview
The TRANSFIX™DGA 500 (herein referred to as the product, meaning the standard AC-
only PSU and the AC/DC-capable PSU) are on-line DGA (Dissolved Gas Analysis) systems
for transformer diagnostics. The standard DGA 500 is capable of running on an AC supply
of 115/230 V AC continuous, whereas the DGA 500 Universal Power Supply is capable of
running on an AC supply of 100-230 V AC or a DC supply of 100-220 V DC continuous. The
product measures the following key fault gases in the transformer oil: hydrogen,
methane, ethylene, carbon monoxide, and acetylene. In addition the product also
measures moisture in the oil and the transformer load current. Such data provides insight
on transformer condition criteria, such as developing faults, paper degradation and
electrical arcing. Once installed, operation is straightforward. All results are stored within
the product, but can be downloaded to a PC for analysis.
The key features and characteristics are summarised as follows:
Utilises dynamic headspace sampling to extract target gases from the oil sample.
No consumables, such as carrier gases are required.
Accurate results are available as often as once per hour.
Minimal maintenance*.
Uses highly accurate and stable Photo-acoustic Spectrographic technology.
Fully embedded microprocessor with non-volatile internal memory storage for
10,000 records.
Stainless steel outdoor-rated IP55 enclosure connected to the transformer by
robust stainless steel tubing.
All gas sensing is carried out internally –no external gas sensors.
Transformer load tracking is available.
Six user-configurable relay contacts based on absolute gas and moisture values.
Two user-configurable sunlight-visible LED arrays on the exterior of the enclosure –
one red for alarm, one yellow for caution.
A standard sunlight-visible green LED array –solid for power, flashing for service.
Communication options include: Ethernet, IEC61850®, RS-232, Cellular modem
(GSM/GPRS), PSTN modem, RS-485 and Fibre Optic. Other options may be available
on request.
Internal USB connection provided for commissioning and service, or local data
download.
*Note: The only recommended maintenance is periodic cleaning of the air filters, in-line oil filter and
battery replacement.
1.2 Manual Scope
This guide outlines the use of the LCD display panel and general maintenance activities.

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 5 of 28
2SAFETY
2.1 Symbols
The following symbols are used in this manual and/or on this product:
General Warning or Caution. Refer to the Installation Manual / User
Guide to prevent injury or damage to equipment.
Electrical Hazard. Risk of electric shock.
Primary Protective Earth connection.
Hot surfaces may be present.
2.2 Warnings
The following warnings must be observed:
The minimum ambient temperature for installation and service activities is
−10 °C.
If the equipment is installed or used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
If working at height, third parties must have received appropriate training for
working at height prior to work commencing. This includes, but is not limited to
"Working at height training".
If working at a height greater than 4 feet or at a height greater than that
stipulated by national or site regulatory requirements, it is the responsibility of
the user to ensure that planned work complies with those requirements.
The user shall also ensure that any third-party equipment, such as an approved
platform, scaffold or lift is suitable and safe before commencing work. Ladders
or improvised platforms do not meet GE service engineer requirements.

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 6 of 28
Once installed, this product may have more than one source of supply.
Disconnect all supplies at their source before accessing the cabinet for
servicing. Follow the site lockout-tagout (LOTO) procedure.
Disconnection from the supply is achieved through the external circuit breaker
or switch.
Ensure all power sources, including relays, are de-energised as stipulated by
lockout-tagout (LOTO) requirements before removing inner covers.
The product is operated with the door shut under normal use. The door shall be
kept locked and should only be opened for service access by suitably qualified
and authorised service personnel. During service access, hazardous voltages
are accessible.
Only GE-trained and certified personnel may commission GE products.
Commissioning tasks include making any connections and/or performing any
work within the enclosure, or performing tasks such as purging the oil circuit
between the transformer and the product, and/or all first start-up procedures
relating to equipment or firmware/software.
The product provides IP55 level water spray protection. It is possible for a water
deluge system to exceed IP55 thresholds depending on the location, pressure
and direction of the water jets. Therefore should customers require testing a
water deluge system in the area in which the product is installed, GE
recommends powering down the product and draping it with a suitable
waterproof covering.
2.3 Hazardous Substances
The gases measured in the product are extracted from the oil and expelled to the
atmosphere. These gases are at concentrations that are nonflammable, nontoxic and
quickly diluted in the surrounding atmosphere. The expelled gases are not hazardous to
health or life.

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 7 of 28
3TECHNICAL SPECIFICATION
The product meets the following technical specification as outlined in Table 3—1.
Table 3—1: Technical specification
PARAMETER
VALUE/MEETS
GAS MEASURED
MEASUREMENT RANGE (ppm) and accuracy
Hydrogen (H2)
5 –5,000 Accuracy ± 5% or ± LDL (whichever is greater) *1
Methane (CH4)
2 –50,000 Accuracy ± 5% or ± LDL (whichever is greater) *1
Ethylene (C2H4)
2 –50,000 Accuracy ± 5% or ± LDL (whichever is greater) *1
Acetylene (C2H2)
0.5 –50,000 Accuracy ± 5% or ± LDL (whichever is greater) *1
Carbon Monoxide (CO)
2 –50,000 Accuracy ± 5% or ± LDL (whichever is greater) *1
Moisture (H2O)
0 –100% RS (given in ppm)
ENVIRONMENTAL
External temperature range
DGA 500 (AC only)
−40 °C to 55 °C
DGA 500 Universal Power Supply:
−25 °C*2 to 55 °C
Oil temperature range
−20 °C to 120 °C *3
Altitude
Up to 2000 m
Atmospheric pressure
Up to 1050 mbar
Operating humidity
10 –95% RH non-condensing
Enclosure
IP55
Weight
72 kg (159 lb)
MEASUREMENT FREQUENCY
Variable –Once per hour to once every 4 weeks
POWER REQUIREMENTS
DGA 500 (AC only)
115/230 V AC*4 (factory set), 50/60 Hz, 8 A Max
Single phase Alarm Relays: NO and NC
provided*4
3 A 250 V AC
150 mA 300 V DC, 200 mA 125 V DC, 3 A 30 V DC
Fuses*6
10 A 500 V (Cooper Bussmann BAF), 10x38 mm
DGA 500 Universal Power Supply
Nominal voltage
100–230 V AC, 5 A Max
100–220 V DC, 5 A Max
Voltage range
90–253 V AC
90–242 V DC
Frequency
45–65 Hz
Single phase Alarm Relays: NO and NC
provided*4
3 A 250 V AC
150 mA 300 V DC*5, 200 mA 125 V DC, 3 A 30 V DC
Fuses*6
10 A 600 V AC (Cooper Bussmann CUBEFuse, TCF10RN)
*1 Note: Accuracy quoted is the accuracy of detectors during calibration; gas-in-oil measurement
accuracy may also be affected by sampling and/or oil type.
*2 Note: The Power Supply Unit (PSU) is type tested to −40 °C cold start.
*3 Note: Based on testing carried out using VOLTESSO 35 mineral oil over a ¼ in. pipe run of 10 metres or
less from oil supply or return valve to product connection point, and on transformer oil supply valve
volumes of 200ml or less.
*4 Note: A suitably rated fuse must be added to the circuitry in accordance with local regulations.
*5 Note: Maximum DC breaking capacity for a resistive load.
*6 Note: Use only the approved and recommended fuse to ensure continued fire protection and
compliance.

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 8 of 28
4DESIGN CRITERIA
The product is designed to meet the following type tests as listed in Table 4—1:
Table 4—1: Type tests
Category
Standard
Class/Level
Test
EMC Emissions –
EN 61326-1:2006
CISPR 11
A
Radiated & Conducted Emissions
FCC Part 15
A
Radiated & Conducted Emissions
EN 61000-3-2
A
Harmonic Current Emissions
Limits
EMC Immunity –
EN 61326-1:2006
EN 61000-4-2
IV
Electrostatic Discharge
EN 61000-4-3
III
Electromagnetic Field Immunity
EN 61000-4-4
III
Electrical Fast Transients
EN 61000-4-5
III
Surge Immunity
EN 61000-4-6
III
Conducted RF Immunity
EN 61000-4-8
IV & V
Magnetic Field Immunity
IEC 61000-4-9
X
Pulsed Magnetic Field Immunity
IEC 61000-4-10
X
Damped Oscillatory Magnetic
Field Immunity
EN 61000-4-11
III
Voltage Dips & Interruptions
IEC 61000-4-12
X 2.5 kV & 1kV
Oscillatory Wave
IEC 61000-4-18
X
Damped Oscillatory Wave
EN 61000-3-3
Pst 10 min, Plt 120 min
Voltage fluctuations & flicker
EN 60255-5
5 kV, 2 kV & 500 V DC
Impulse, Dielectric & Insulation
resistance testing
Environmental
IEC 60068-2-1
−40 °C
Cold
IEC 60068-2-2
55 °C
Dry Heat
IEC 60068-2-6
10 –150 Hz, 0.5 g operation
10 –150 Hz, 0.5 g endurance
Vibration
IEC 60068-2-30
55 °C, 95% RH
Damp Heat
EN 60529
IP55
Degree of Protection
Safety
IEC 61010-1
2010
EN 61010-1
2010

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 9 of 28
5POWER
5.1 Introduction
The locations of the power supply terminals for the mains supply and the fuse holders
with modular fuses for the products are shown in Figure 5—1 and Figure 5—2
respectively.
Figure 5—1: DGA 500 (AC only) LED indicator lights &
fuse holder
Figure 5—2: DGA 500 Universal Power Supply LED
indicator lights & fuse holder
The product uses three external sunlight-visible LEDs on the front door. The LED states
are listed in Table 5—1.
Table 5—1: External LED status indicators
Mode
Alarm (red) LED
Caution (yellow) LED
Power/Service (green) LED
Power Off
-
-
-
Normal
-
-
On
Alarm
On
-
On
Caution
-
On
On
Service
-
-
Flashing
5.2 Cold Start
If the product is powered up in cold conditions (less than −10 °C), the internal heaters
automatically switch on to increase the internal temperature to within the PGA
operational temperature range before a measurement can commence. The main DC
power supply remains off until the working temperature reaches −10 °C, after which the
DC power supply is restored. The DC power indicator lights are situated on the circuit
board at the back of the product casing as shown in Figure 5—2.
Note: Once the DC power supply is restored, the internal temperature may take several hours to reach a
working temperature before a measurement cycle can begin.
24 V DC
LED
12 V DC
LED
Fuse holders for
mains input power
Fuse holders for mains
input power
24 V DC
LED
12 V DC
LED

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 10 of 28
5.3 Battery
The product uses a non-rechargeable lithium coin cell battery (Panasonic® CR2450 3 V
620 mAh) as shown in Figure 5—3. In the event that the battery needs to be replaced,
data from the product must be backed up. Failure to do so may result in historical data
loss.
Figure 5—3: Coin cell battery
The following steps describe how to change the battery:
1. Back up the product data –contact your GE representative.
2. Open the inner door to locate the battery on the system board (as
shown in Figure 5—3).
3. Slide the battery out of its housing.
4. Replace with a new Panasonic CR2450 3 V 620 mAh coin cell.
5. Close the inner door.
There is a danger of a new battery exploding if installed incorrectly.
Dispose of the used battery in accordance with local regulations —not in a fire
or with household waste. Contact your local waste disposal agency for the
address of the nearest battery deposit site. Perchlorate material —special
handling may apply. See: www.dtsc.ca.gov/hazardouswaste/perchlorate/

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 11 of 28
5.4 Power-Down Procedure
If the transformer is to be shut down or the product needs to be shut down, perform the
following steps:
1. Open the door of the product and observe the operating mode on the LCD panel.
2. If the product is in Standby mode as shown in Figure 5—4, perform the following
steps:
Turn the external switch or circuit breaker to the ‘Off’position.
Turn the transformer oil valves that connect to the input and output of the
product to the ‘Off’position.
Figure 5—4: Standby mode
Figure 5—5: Operation mode
3. If for example, as shown in Figure 5—5 the product is in Operation mode, perform
the following steps:
Press the red Stop button (Figure 5—4) or use the TransConnect™ software to
stop an active measurement.
The LCD reads “OIL DRAINING”. This process may take several minutes.
Turn the external switch or circuit breaker to the ‘Off’position.
Turn the transformer oil valves that connect to the input and output of the
product to the ‘Off’position.
When the product is to be powered up again, first turn the transformer oil valves that
connect to the input and output of the product to the ‘On’ position. Then turn on the
external switch or circuit breaker. The product will be ready to resume taking scheduled
readings.

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 12 of 28
6LCD DISPLAY PANEL
The LCD display panel is located on the inner cover and is visible when the door is open
as shown in Figure 6—1.
Figure 6—1: Inside view
During an analysis, the display panel shows the serial number of the product and the
operational state. The last measurement results with date and time stamps can be
obtained by using the black scroll buttons to page up or down through the details (see
Section 6.2 for examples). By default, automatic paging is turned off.
In the event of an error, details are shown on the display panel (see Figure 6—2 for an
example). The middle line indicates the state within the measurement process at which
the error occurred —denoted by a double-digit code. For example, 02 indicates an error
in the oil purging state. The last line indicates the errors in that state —denoted by a
sequence of double digits codes each representing a specific error. For example, 18
means that the oil pressure is too low (see Section 6.2 for a list of defined error codes).
Note: If contacting the Customer Service Centre, ensure that you provide the state code and error code.
Figure 6—2: LCD information notice –error format (top) & example (below)
Display Panel
Scroll Up
Scroll Down
Start
Stop
USB Connection
DGA500
>>>> ERRORNN <<<<
NN, NN, NN, NN, NN, NN, NN
DGA500
>>>> ERROR02 <<<<
18
State code
Error codes

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 13 of 28
6.1 LCD Information Notices
The section outlines some examples of the information notices and data pages rendered
on the LCD display panel for a standard environment using factory settings. It illustrates
typical information that a user is likely to see during normal operation. This can vary
depending on the operational environment, firmware version and how the product is
configured.
6.1.1 Startup
6.1.1.1 Boot
The Boot notice displays after power up or reset and progresses through a code checking
sequence as shown in Figure 6—3. If boot problems occur, the product raises an error.
Contact the Customer Service Centre.
Figure 6—3: Boot
6.1.1.2 Version
If the boot sequence is successful, a Version notice reflects the product name, serial
number, firmware version and PGA version as shown in Figure 6—4. Use the black scroll
buttons at any time to page through the various information notices and data pages,
including existing measurement results.
or
Figure 6—4: Version
6.1.1.3 Standby
An information notice indicates the operational mode as shown in Figure 6—5. Standby
mode is the initial operational mode. If scheduled measurements are configured, they will
occur automatically at the scheduled time (see Section 6.1.2.3). If there are no scheduled
measurements, the Scheduler Disabled notice displays.
or
Figure 6—5: Standby mode
DLM 1.2.0
CODE CHECKING
DGA500
DX5-AUPS000008
3.0.0
PGA: 12.3.77
DGA500
DX5-A0000x
3.0.0
PGA: 12.3.77
2015-04-02 10:00:00
STANDBY
>>> OK <<<
2015-04-02 10:00:00
SCHEDULER DISABLED
MAIN
>>> OK <<<

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 14 of 28
6.1.1.4 Peripheral Scheduler
An information notice lists all peripheral connections as shown in Figure 6—6. If the
peripheral scheduler is enabled, all analogue inputs are listed with corresponding null
values. The product has analogue inputs AIn1 to AIn6, but corresponding values for these
appear after peripheral(s) are connected. By default, a newly shipped product has no
connected peripherals, but a configured installation may have a load sensor connected.
or
Figure 6—6: Peripheral scheduler
6.1.2 Manual Measurements
6.1.2.1 Start a Manual Measurement
Use the blue Start button to initiate a manual measurement on the main tank. The timer
automatically counts down from 10 seconds and then indicates the start of a manual
measurement as shown in Figure 6—7.
Figure 6—7: Start a manual measurement
6.1.2.2 Stop a Measurement
Use the red Stop button to abort an active measurement. After any remaining oil in the
headspace drains, the product returns to Standby as shown in Figure 6—8.
Figure 6—8: Stop a measurement
PERIPHERAL SCHEDULER
STANDBY
>>> OK <<<
MAIN
Analn0 0000.0uuu
Analn1 0000.0uuu
Analn2 0000.0uuu
MAIN
>>> OK <<<
MAIN
MEASUREMENT IN
10 s
2015-04-02 11:21:00
MAIN
MEASUREMENT STARTED
2015-07-30 11:21:10
MAIN
>>> OK <<<
2015-04-02 11:45:00
OIL DRAINING
2015-04-02 12:00:00
STANDBY

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 15 of 28
6.1.2.3 Measurement Data
Use the black scroll buttons at any time to page through the notices and see the
measurement data. For example, data for the main tank is shown in
Figure 6—9. The product can also be configured to automatically page through the
results of the last analysis.
Figure 6—9: Measurement data
6.1.3 Further System Specifications
6.1.3.1 Communications Channels
The product has two serial communications channels. For example, default configuration
details are shown in Figure 6—10, such as the interface, protocol, baud rate, modbus
address and parity error-checking format.
MAIN
LAST MEASUREMENT
2015-04-02 12:48:10
MAIN
Hydrogen ?????.? ppm
Methane ?????.? ppm
CarbonMono ?????.? ppm
MAIN
Ethylene ?????.?ppm
Acetylene ?????.?ppm
TDCG ?????.?ppm
MAIN
Water ?????.?ppm
MAIN
NHC None
MAIN
Amb Temp - 0.1 °C
Oil Temp +38.3 °C
Oil Press +97.1 kPa
MAIN
AIN 1 -1.111xxx
MAIN
NEXT MEASUREMENT
2015-04-02 16:48
MAIN
LAST MEASUREMENT
2015-04-02 12:48:10
MAIN
Hydrogen ?????.? ppm
Methane ?????.? ppm
CarbonMono ?????.? ppm
MAIN
Ethylene ?????.?ppm
Acetylene ?????.?ppm
TDCG ?????.?ppm
MAIN
Water ?????.?ppm
MAIN
NHC None
MAIN
Amb Temp - 0.1 °C
Oil Temp +38.3 °C
Oil Press +97.1 kPa
MAIN
AIN 1 -1.111xxx
MAIN
NEXT MEASUREMENT
2015-04-02 16:48

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 16 of 28
Figure 6—10: Communication channels
6.1.3.2 Networking
If Ethernet is enabled and a RJ-45 connection made, relevant network details are shown.
For security reasons, all network details are hidden by default as shown in Figure 6—11,
but these can be software enabled.
Figure 6—11: Networking
6.1.3.3 Other System Details
Additional information notices reflect the configuration of the product. For example, if a
GSM/GPRS modem is fitted, additional page(s) as shown in Figure 6—12 reflect the
communications provider, signal strength and any problems.
Figure 6—12: GSM / GPRS modem
Notes:
a) Actual product values depend on the installation at any moment in time.
b) Actual parameter format can vary e.g. CO or Carbon Monoxide.
c) See Section 6.2 for a list of defined error codes.
d) System Failure mode limits functionality. Contact the Customer Service Centre.
ChA RTU 1 RS232
19200 0
ChB: ASC 1 GSMGPRS
57600 0
IP: XXX.XXX.XXX.XXX
SUB: XXX.XXX.XXX.XXX
GW: XXX.XXX.XXX.XXX
TCP: 502
vodafone UK
MAJOR GPRS PROBLEM

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 17 of 28
6.2 Error Codes
A list of error codes that can appear on the LCD display panel and their meaning are
listed in Table 6—1. All the service alarm error codes are accompanied by flashing of the
green Power/Service LED that is visible on the front door of the product.
Note: Error codes are offset by 1 from the MODBUS® register bit numbers.
Note: This information pertains to the following firmware versions —TransfixHost 1.14.3 in combination
with PGA 12.3.81.
Table 6—1: Errors
Code
Error
Description
PGA Connection Error
The host board (the processor that the customer
interfaces with) has lost communications with the Photo-
acoustic Gas Analyzer (PGA). Therefore the host board
cannot send a signal to the PGA to initiate a
measurement. The product will remain in Standby mode
with this error continuously displayed.
Timeout
The product has exceeded a set time limit to perform an
action. The product will abort the measurement.
00
Missing mains input
Incoming AC voltage is outside of expected range. The
product will complete the measurement. This alarm is
obsolete and has been disabled.
01
PGA power supply voltage too low
Voltage that powers the PGA has dropped below the
expected voltage. The product will complete the
measurement. The final values may not be reliable.
02
PGA chopper frequency outside range
The infrared energy is being pulsed at a frequency outside
of the expected frequency. The product will abort the
measurement.
03
PGA IR-source outside range
The infrared energy source feedback is outside of the
expected range indicating the infrared energy source is
either too weak or too strong. The product will abort the
measurement.
04
Gas flow lower than limit
The flow of gas internal to the product is lower than
expected. The product will complete the measurement.
The final values may not be reliable.
05
Background noise/vibration too high
The PGA has detected excessive noise, which may be
mechanical or electrical in nature. The product will
complete the measurement. The final values may not be
reliable.
06
Microphone test failed
The signal from the microphone(s) is (are) outside of the
expected range. The product will complete the
measurement. The final values may not be reliable.
07
Not level sensor 1 pulses (level)
Not used on the TRANSFIX family.
08
Not level sensor 3 (drain)
The product is testing the functionality of the drain level
sensor during fault debugging and will trigger this service
alarm if no oil is detected when oil is expected. The
product will abort the measurement.
09
Fill level shows Oil
The product is expecting the gas extraction chamber
(headspace) to be empty of oil and oil is detected at the
full level sensor. The product will abort the measurement.
10
Over Fill shows Oil
The product has detected that too much oil is in the
headspace. The product will abort the measurement.
11
PGA Air temperature outside limits
The internal temperature of the product is outside the
expected range. The product will abort the measurement.

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 18 of 28
Code
Error
Description
12
Bad communication with control PCB
No communication between the PGA and the circuit
board that controls the pump, valves and various sensors.
The product will abort the measurement.
13
Gas leak test: Pump pressure too low
The product performs a self-diagnostic gas leak test on
every measurement cycle. ‘Pump pressure too low’
indicates the product was not able to pull a vacuum due
to either a weak pump, blockage in the circuit or leak in
the circuit. The product will complete the measurement.
The final values may not be reliable.
14
Gas leak test: Pressure decay too high
The product performs a self-diagnostic gas leak test on
every measurement cycle. ‘Pressure decay too high’
indicates the product was not able to maintain a vacuum
due to a gas leak. The product will complete the
measurement. The final values may not be reliable.
15
-
Not used on the TRANSFIX family.
16
Oil temperature too low
The incoming oil temperature is below the expected
range. The product will abort the measurement.
17
Oil temperature too high
The incoming oil temperature is above the expected
range. The product will abort the measurement.
18
Oil pressure too low
The oil pressure internal to the product is below the
expected range. This can be due to a blockage on the
supply side of the oil circuit, often a closed valve or
clogged filter, or no oil present at the supply valve on the
transformer, sometimes seen when sampling from the
top of a N2 blanketed transformer. The product will abort
the measurement.
19
Oil pressure too high
The oil pressure internal to the product is above the
expected range. This can be due to a blockage on the
return side of the oil circuit, often a closed valve or
clogged filter. The product will abort the measurement.
20
Oil pump tacho count too high
The number of pump cycles needed to either fill or drain
the headspace with oil has exceeded the expected range.
This can be a blockage on either the oil supply or oil
return depending on when the error occurs. The product
will abort the measurement.
21
Oil pump pressure too low
The oil pressure internal to the product when the oil pump
is on is below the expected range. This can be due to a
blockage on the supply side of the oil circuit, often a
closed valve or clogged filter, or no oil present at the
supply valve on the transformer, sometimes seen when
sampling from the top of a N2 blanketed transformer. The
product will abort the measurement.
22
Oil pump speed out of range
The feedback from the oil pump is outside the expected
range indicating that the pump is not pumping at the
correct speed. The product will complete the
measurement. The final values may not be reliable.
24
Oil pump tacho count too low
The number of pump cycles needed to either fill or drain
the headspace with oil is below the expected range. This
can be due to an internal oil leak between the product’s
oil circuit and the headspace. The product will complete
the measurement. The final values may not be reliable.
25
Oil pump not turning
There is no feedback from the oil pump indicating that the
pump is not working. The product will abort the
measurement.
26
-
Not used on the TRANSFIX family.

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 19 of 28
Code
Error
Description
27
Temperature Sensor(s) 1 disconnected
The product is not receiving a signal from one or more of
the vital temperature sensors. The product will abort the
measurement.
28
Temperature Sensor(s) 2 disconnected
The product is not receiving a signal from one or more of
the less vital temperature sensors. The product will
complete the measurement. The final values may not be
reliable.

MA-014 - TRANSFIX DGA 500 User Guide –Rev 1.1 13-Oct-15 Page 20 of 28
7MANUAL OIL SAMPLING
7.1 Sampling Arrangement
The optional oil sampling port (if fitted) is located on the oil inlet on the base of the
product. This gives access to fresh oil via a manual sampling arrangement as shown in
Figure 7—1 to Figure 7—3.
Figure 7—1: Manual sampling arrangement
Figure 7—2: Product fitted with manual sampling
arrangement
Figure 7—3: PTFE tubing
Before commencing work, ensure the use of suitable protective gloves, such
as nitrile rubber.
Perform the manual oil sampling according to the sampling process outlined in Figure 7—
4. GE recommends the use of a 50-ml ground glass syringe. Manual oil sampling shall be
performed while the product is in Standby mode —either wait until the product returns to
Standby mode or force the product to stop the current measurement cycle using the
TransConnect software. The optimum time to perform a manual sample is just after the
product has completed a measurement because fresh oil will be at the manual sampling
point.
Note: Collecting a manual sample while the product is performing a measurement is not
recommended as this could potentially affect the readings.