MSA ULTIMA X5000 User guide

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ULTIMA X5000 Gas Monitor Safety Manual
Order No.: 10177362/01
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USA
Phone 1-800-MSA-2222
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© MSA 2022. All rights reserved
This manual describes only the SIL related safety information for the ULTIMA X5000 to support installations where SIL
certification to IEC 61508 is required.
For complete information regarding performance, installation, operation, maintenance, safety information, warnings and
specifications of the ULTIMA X5000 Gas Monitor, please refer to the associated product manual (P/N 10177361).
The safety product you have purchased should be handled carefully, and installed and maintained in accordance with the
associated product instruction manual. Remember, this product is for your safety.
WARNING
Toxic, combustible, and flammable gases and vapors are very dangerous. Use extreme caution when
these hazards are present.
Failure to follow this warning can result in serious personal injury or death.
WARNING
Under no circumstances should this equipment be connected or disconnected when under power. This is
contrary to hazardous area regulations and may also lead to serious damage to the equipment. It is,
however, permissible to disconnect and replace sensors without removing power in a class I
(combustible gas) area.
Failure to follow this warning can result in serious personal injury or death.
WARNING
The ULTIMA X Series Gas Monitor is qualified as a SIL 2 device under IEC 61508 and must be installed,
used, and maintained in accordance with this manual if compliance with this IEC functional safety
standard is desired. Failure to do so can result in a reduced safety level.

Contents
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Contents
1. Introduction ............................................................................................................................................... 5
2. Safety and Precautionary Measures to Be Adopted ............................................................................. 6
3. Operational Safety Concerns .................................................................................................................. 7
3.1. Calibration ........................................................................................................................................ 7
3.2. Changing or Replacing Sensors ...................................................................................................... 7
3.3. System Faults .................................................................................................................................. 7
3.4. Minimizing Undetected Faults .......................................................................................................... 7
4. Functional Safety Installation ................................................................................................................. 8
4.1. Safety Function ................................................................................................................................ 8
4.2. Measurement Range ........................................................................................................................ 8
4.3. Diagnostic Response Time .............................................................................................................. 8
4.4. Proof Test Steps .............................................................................................................................. 9
4.5. Safety-relevant Parameters ............................................................................................................. 9
4.6. Application specific restrictions ........................................................................................................ 9
5. Unit Identification ................................................................................................................................... 12
5.1. Component Overview ..................................................................................................................... 12
5.2. Label Overview .............................................................................................................................. 12
5.3. Software ......................................................................................................................................... 14
6. Specifications ......................................................................................................................................... 15
7. Safety Function....................................................................................................................................... 16
8. Appendix A .............................................................................................................................................. 17

Contents
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Tables
Table 1: Safety Relevant Parameters ......................................................................................................... 10
Table 2 Environmental/Electrical Specifications ......................................................................................... 15
Table 3 Analog Output Default Values ........................................................................................................ 15
Table 4 Fault Reporting Time (Refer to Appendix A) .................................................................................. 16
Table 5 Troubleshooting .............................................................................................................................. 17

Contents
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1. Introduction
The MSA ULTIMA X5000 Gas Monitor, hereafter also called the device, is designed to monitor the
environment where mounted and alert the user to potentially dangerous levels of target gas. The
ULTIMA X5000 uses various detection methods, depending on the gas of interest. Detection methods
include electrochemical, infrared, catalytic bead or other technologies.
The ULTIMA X5000 is capable of communicating with and displaying information for two sensors at a time.
The device generates two discrete analog outputs; one for each sensor connected to the transmitter. Each
analog output is a standard 4 to 20 mA sourcing output. The analog output associated with Sensor 1 has
HART (Highway Addressable Remote Transducer) communication encoded on it. If two sensors are
connected, the HART communication on output 1 carries information for both sensors.
Relays and other communication protocols are available as an option.
The ULTIMA X5000 is suitable for installation in hazardous locations. It is intended for integration with a
control system that can alert operations personnel to the presence of a gas alarm. The ULTIMA X5000
Gas Monitor is regarded as Type B field device per IEC 61508.

Safety and Precautionary Measures to Be Adopted
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2. Safety and Precautionary Measures to Be Adopted
WARNING
Failure to follow the recommendations shown below can result in an unsafe condition and persons who
rely on this product for their safety could sustain severe personal injury or loss of life.
 The device described in this manual must be installed, operated and maintained in strict accordance
with the labels, cautions, instructions and within the limitations stated.
 Protect the device from extreme vibration.
 Do not mount the device in extreme heat or sunlight as this may cause overheating. A sunshield is
available to protect from extreme environments.
 Use only genuine MSA replacement parts when performing any maintenance procedures. Failure to
do so may seriously impair device performance. Repair or alteration of the device beyond the scope
of the product instructions or by anyone other than an authorized MSA service provider could cause
the product to fail to perform as designed.
 Do not paint the device. If painting is done in an area where the device is located, exercise caution to
ensure paint is not deposited on the device. Such paint deposits could interfere with the device
operation. Solvents in the paint may also cause an alarm condition to occur.
 Do not use a high pressure wash on the device. Forced water entry to some sensor inlets can
obstruct the gas path leading to degraded performance.
 XIR Plus sensors should be mounted horizontally. Non XIR Plus sensors should be mounted vertically
facing down. This will help ensure that environmental particulates will not block the gas path to the
sensor. It is recommended to periodically perform a visual inspection of the sensor gas inlet as part of
normal maintenance. Failure to follow this recommendation can lead to degraded performance.
 Do not use silicone type lubricants in assembling the device and do not allow silicone vapors to be
drawn into the flow system while in operation. Silicone can desensitize the combustible gas sensor
thereby giving incorrect readings.
 Before connection to a monitoring controller (PLC, DCS, etc.), the user or installer must be properly
trained with respect to the specific controller operation, input/output hardware, configuration and
startup procedures.

Operational Safety Concerns
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3. Operational Safety Concerns
For additional operational information refer to the product instruction manual (P/N 10177361).
3.1. Calibration
The ULTIMA X5000 allows the user a method for sensor calibration. This typically includes a zero and span
operation with target gas. Refer to the instruction manual for full details on calibration methodology for each
sensor type.
The frequency of calibration gas testing depends on the operating time, chemical exposure and type of
sensor. Especially in new installations or applications, it is recommended that the first sensors be calibrated
more often to establish the sensor performance in this particular environment. For the purposes of
compliance to IEC 61508 a proof test interval is required and is shown in this manual under the section titled
“Certifications and Failure Rate Data”.
3.2. Changing or Replacing Sensors
SafeSwap
The ULTIMA X5000 comes with patented SafeSwap technology, which allows users to change or replace
XCell sensors without needing to power down the instrument. For non-XIR Plus sensors, the main
transmitter unit will accept different sensor modules. When a sensor is changed in the field, the main
transmitter unit will communicate with the sensor module and identify its target gas type and calibration
information. The gas type will show on the main transmitter display. When replacing a sensor, verify that the
correct sensor has been installed by viewing the gas type shown on the instrument display. In addition, it is
recommended that proper installation be verified by applying the gas of interest to the sensor to ensure a
proper response.
Refer to the associated product manual (P/N 10177361) for warnings and instructions for changing or
replacing sensors under power.
Swap Delay
For added convenience, all sensors with SafeSwap also have a Swap Delay which is enabled by default and
may be disabled by the user. This feature gives users a 2 minute window to change sensors without
triggering a fault condition. Once a sensor is disconnected from the transmitter, the user will have 2 minutes
to reconnect a sensor. During this time, the device analog output will go to its Maintenance level. If a sensor
is reconnected or replaced during the 2 minute window, the new sensor’s countdown sequence will begin
and the analog output will remain at the Maintenance level. After the sensor countdown is complete, the
analog output will return to reporting a live gas reading. If a sensor is not reconnected after the 2 minute
window, the ULTIMA X5000 will enter a “Sensor Missing” fault condition.
3.3. System Faults
The ULTIMA X5000 monitors itself for many conditions and will report abnormalities to the user. Refer to
Appendix A for a list of potential faults and troubleshooting recommendations.
3.4. Minimizing Undetected Faults
The ULTIMA X5000 was designed with a very high level of reliability and fault detection; however the
possibility of an undetected fault still exists. Should an undetected fault occur, there is a chance that a
potentially dangerous gas reading will not be registered.
While the chance of an undetected fault cannot be completely eliminated, certain steps can be taken to
minimize the probability. Regular maintenance is crucial to proper operation of the equipment. Frequent gas
application is also an excellent means of insuring proper operation of the equipment.
Refer to the instruction manual for full details. Adherence to the proper installation, maintenance, calibration
and operation will minimize the probability of undetected faults.

Functional Safety Installation
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4. Functional Safety Installation
4.1. Safety Function
The Ultima X5000 detects hydrocarbon, toxic, and oxygen gas atmospheres and provides a 4-20 mA output
depending on the concentration in air, see user manual for additional information. See figure 1 for
representation of the safety function and non-interfering communications.
Fig. 1 Safety function
HART, Modbus, and Bluetooth, communication are typically used for field device setup, diagnostics, and
troubleshooting. Carefully observe requirements for interfacing in hazardous locations. HART, Modbus, and
Bluetooth communication are non-interfering functions and do not interrupt the safety critical function of the
device.
4.2. Measurement Range
The X5000 provides an analog 4-20 mA output that is proportional to hydrocarbon vapor, toxic, or oxygen
concentrations. The X5000 output measurement provides defined fault condition current levels below 3.6 mA
or above 20.5 mA as outlined in the Instruction Manual.
4.3. Diagnostic Response Time
The X5000 monitors itself for many conditions and will report abnormalities to the user. All critical diagnostic
functions are performed within 24 hours as the worst case diagnostic detection time.

Functional Safety Installation
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4.4. Proof Test Steps
1. Bypass the safety function and take appropriate action to avoid a false trip.
2. Use HART communications to retrieve any diagnostics and take appropriate action.
3. Send a HART command to the transmitter to set gas reading to the HIGH alarm setting and verify that
the analog current reaches the appropriate value.
4. Send a HART command the transmitter to set gas reading to the LOW alarm setting and verify that the
analog current reaches the appropriate value.
5. Inspect the transmitter for any visible damage or any other communication.
6. Perform sensor calibration per the instructions provided in user manual 10177361.
7. Remove any safety function bypass and restore normal operation.
4.5. Safety-relevant Parameters
The X5000 has been subjected to rigorous reliability and functional safety assessments which have
culminated in the device being certified to IEC 61508 (Ed. 2). It is assumed that the field devices will be
installed in a Safety Instrumented System (SIS) in a Low Demand or High Demand environment per
IEC 61508. The following provides the SIL parameters for the Transmitter and Receiver devices:
Safety Integrity Level (SIL) SIL 1 SIL 2 SIL 3
Low Demand Mode (LDM) / High Demand
Mode (HDM)
LDM HDM LDM HDM LDM HDM
Structure 1oo1 X X X
Structure 1oo2 X X X X X X
λSD, λSU, λDD, λDU See Table 1
Hardware Fault Tolerance (HFT) SIL 2 HFT = 0, SIL 3 HFT = 1
Type Classification B
Mean Time to Restoration (MTTR) 4 hours
Proof Test Interval (PTI) 3 months
Systematic Capability SC 2
4.6. Application specific restrictions
The following application specific restrictions are applicable to the X5000 and have been considered during
the Failure Modes, Effects and Diagnostic Analysis of the X5000. These restrictions shall be included in the
safety manual for the X5000.
 The failure rates for the Xcell sensor sections do not include the sensor failure rates, which must be
added to obtain the complete metrics.
 If the relay board option is used the Fault Relay output must be monitored by the logic solver.

Functional Safety Installation
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Sample PFDavg Calculations:
𝑃𝐹𝐷 =(𝜆
(𝑇
2+𝑀𝑇𝑇𝑅)+𝜆 ∗ 𝑀𝑇𝑇𝑅
𝑇= 𝑃𝑟𝑜𝑜𝑓 𝑇𝑒𝑠𝑡 𝐼𝑛𝑡𝑒𝑟𝑣𝑎𝑙 (ℎ𝑜𝑢𝑟𝑠)= 2190 (3 𝑀𝑜𝑛𝑡ℎ𝑠)
𝑀𝑇𝑇𝑅 = 𝑀𝑒𝑎𝑛 𝑇𝑖𝑚𝑒 𝑇𝑜 𝑅𝑒𝑠𝑡𝑜𝑟𝑎𝑡𝑖𝑜𝑛(ℎ𝑜𝑢𝑟𝑠)=4
𝑆𝑡𝑟𝑢𝑐𝑡𝑢𝑟𝑒 = 1𝑜𝑜1
Table 1: Safety Relevant Parameters
Device λSD λ
SU λ DD λ DU PFD avg
Common 484 153 380 170 1.88E-04
Xcell 1 3 0 37 14 1.54E-05
Xcell 2 3 0 41 15 1.65E-05
mA Output 1 0 12 87 12 1.32E-05
mA Output 2 0 12 12 0 0.00E+00
Relay output 93 79 69 80 8.79E-05
Cat Bead 477 167 605 1978 2.17E-03
Echem Toxic 385 385 457 1825 2.01E-03
Echem Oxygen 386 1814 454 407 4.47E-04
Xcell Toxic 417 385 417 1830 2.01E-03
Xcell Oxygen 418 1812 417 402 4.42E-04
Life & Health 1679 155 2654 735 8.08E-04
Diffusion Supervision 1106 866 2017 1453 1.60E-03
XIR Plus 223 66 267 80 8.79E-05
𝜆 =𝐹𝑎𝑖𝑙 𝑆𝑎𝑓𝑒 𝐷𝑒𝑡𝑒𝑐𝑡𝑒𝑑∗10

𝜆 = 𝐹𝑎𝑖𝑙 𝑆𝑎𝑓𝑒 𝑈𝑛𝑑𝑒𝑡𝑒𝑐𝑡𝑒𝑑 ∗ 10
𝜆 = 𝐹𝑎𝑖𝑙 𝐷𝑎𝑛𝑔𝑒𝑟𝑜𝑢𝑠 𝐷𝑒𝑡𝑒𝑐𝑡𝑒𝑑 ∗ 10
𝜆 = 𝐹𝑎𝑖𝑙 𝐷𝑎𝑛𝑔𝑒𝑟𝑜𝑢𝑠 𝑈𝑛𝑑𝑒𝑡𝑒𝑐𝑡𝑒𝑑 ∗ 10

Functional Safety Installation
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Sample Configuration 1:
X5000 Transmitter (Common)
XIR Plus sensor (add mA output 1)
Life & Health sensor (add mA output 2)
Relay boards
𝑃𝐹𝐷 =1.88∗10
 +8.79∗10 +1.32∗10 +8.08∗10 + 0.0+8.79∗10 =1.19∗10 
𝑃𝐹𝐷𝑆𝑎𝑚𝑝𝑙𝑒 1 = 1.19 ∗ 10
NOTE: Total system calculation is required to determine final PFDavg, these calculations do not account for
final elements e.g. safety valves or logic solvers.

Unit Identification
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5. Unit Identification
5.1. Component Overview
Fig. 2 Component Overview
* Only used with M25 bases
5.2. Label Overview
Serial number is located where shown (highlighted in green). Actual number of digits may be different.
Fig. 3 Serial Number Label

Unit Identification
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Fig. 4 Transmitter - Position of Labels
Fig. 5 Board Stack - Position of Labels

Unit Identification
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Fig. 6 Digital Sensor - Position of Labels
Fig. 7 XIR Plus - Position of Labels
5.3. Software
Software information can be read using the display see user manual 10177361 for additional information.

Specifications
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6. Specifications
Table 2 and Table 3 list specifications for the ULTIMA X5000 Gas Monitor. For a complete list of
specifications refer to the product instruction manual.
Table 2 Environmental/Electrical Specifications
Toxics & Oxygen Combustible Catalytic XIR PLUS
Operating temperature
range
-40°C to +60°C -40°C to +60°C -40°C to +60°C
Storage temperature
range
-40°C to +60°C -40°C to +60°C -40°C to +60°C
Humidity range 10-95% RH 0-95% RH 15-95% RH
Input voltage min 11 VDC
Input voltage nominal 24 VDC
Input voltage max 30 VDC
Table 3 Analog Output Default Values
Output Setting (mA) Custom 1 Custom 2 3.5 mA with HART 1.25 mA with HART
Fault 2.0 2.0 3.5 1.25
Calibration (excl. O2) 3.0 3.0 3.5 1.25
Calibration – O2 only 3.0 21.73 3.5 1.25
Ready 4.0 4.0 4.0 4.0
WARN1 Signal 5.6 5.6 5.6 5.6
ALARM2 Signal 8.8 8.8 8.8 8.8
Over Range 21.7 21.7 21.7 21.7
1 Assumes alarm level of 10% full scale
2 Assumes alarm level of 30% full scale
3 For an O2 sensor, 21.7 mA is the default Custom 2 setting and is not configurable.

Safety Function
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7. Safety Function
The ULTIMA X5000 sensor head, utilizes oxygen, combustible and toxic sensors to monitor and alarm to
dangerous and explosive atmospheres.
The element safety functions of the ULTIMA X5000 are defined as follows:
To provide the host system with a predefined 4-20 mA alarm signal output and to de-energize* a relay
(if included) in the event of a dangerous or explosive atmosphere depending on the sensor type
configuration.
*NOTE: The low and high alarm relays must be configured to de-energize to trip for proper SIL function. See
the user manual 10177361 for additional information.
See Table 3 for 4-20 mA alarm signal details in different operation modes.
The analog output range is 0-22 mA. It is normal operation within minimum to maximum detection range is
4 mA to 20 mA respectively. Refer to Table 3 for more detail on specific analog output conditions.
It is recommended to use password protection to prevent unauthorized users from changing configurations.
NOTE: The analog indications below 4 mA are configurable by the user in the range (0-3.75 mA). Refer to
operating manual for specific configuration details.
Table 4 Fault Reporting Time (Refer to Appendix A)
Fault Minimum time Maximum time
Integrated circuit memory 0.050 seconds 24 hours
Sensor w/o Swap Delay 3 seconds 4 seconds
Sensor w/ Swap Delay 120 seconds 121 seconds
Negative Drift 120 seconds 121 seconds
Life and Health Fault 6 hours 6 hours + 1 second
Other 1 second 8 seconds
When ordered the ULTIMA X5000 comes with three SPDT (single pole double throw) relays which include
normally open, common and normally closed contact terminals. Two of the relays correlate to gas reading
and can be configured for either de-energized or energized operation and also may be configured as latching
or non-latching. The third relay is a dedicated fault relay. The fault relay is configured as normally energized,
non-latching. This normally energized default setting is for fail-safe operation and cannot be reconfigured.
In the event of a failure, including loss of power, the fault relay will change state to indicate a fault condition.
The safety function of the ULTIMA X5000 Gas Monitor does not include:
 HART Communication
 RS-485 Modbus communication
 Bluetooth communication
HART, Modbus and Bluetooth communication are typically used for field device setup, diagnostics, and
troubleshooting. Carefully observe requirements for interfacing in hazardous locations. HART, Modbus and
Bluetooth communication are non-interfering functions and do not interrupt the safety critical function of the
detector.

Appendix A
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8. Appendix A
The following table lists all fault messages, their priority levels, and corrective actions required to resolve
them. The faults are listed in alphabetical order. Lower priority messages are output only after the highest
priority message is cleared.
Table 5 Troubleshooting
Priority1 Display Message Status LEDs (G/Y/R) Description Resolution
35 “ACT Fault” ON/ON/OFF Indicates an out of
range measurement
Replace the sensor.
24 “Beads Off Fault” ON/ON/OFF Indicates that the
combustible sensors
beads are OFF.
Acknowledge or cycle
power to the sensor.
Let the sensor
warmup, then
recalibrate the sensor.
If this does not resolve
the issue, replace the
sensor.
23 “Calibration Required” ON/ON/OFF Indicates the sensor
requires calibration.
Calibrate the sensor(s)
attached to the
instrument.
25 “Channel Error” ON/ON/OFF Indicates that there is
an error in the mA
output system.
Reset the sensor.
Verify sensor
configurations (if
different from default
values). Then
recalibrate the sensor.
If this does not resolve
the issue, replace the
sensor.
7 “Configuration Fault” ON/ON/OFF Indicates that an
incorrect configuration
was detected.
Select Reset Main Unit
from Instrument menu.
Verify the customer
settings. Replace the
main PCBA.
4 “EEPROM Fault” ON/ON/OFF Indicates there is an
error with the
EEPROM.
Typically this is a unit
with both sensors
disabled and no
sensor attached.
Attach one sensor to
the unit.
29 “External Memory
Access Error”
ON/ON/OFF Indicates that an error
occured
communicating to the
EEPROM.
Select Reset Main Unit
from Instrument menu.
Verify the customer
settings. Replace the
main PCBA.

Appendix A
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Priority1 Display Message Status LEDs (G/Y/R) Description Resolution
30 “External Memory
Checksum Error”
ON/ON/OFF Indicates the EEPROM
memory is not valid.
Select Controller Data
Reset from Instrument
menu.Verify any
custom settings and re
calibrate the
instrument.
3 “Flash Checksum
Fault”
ON/ON/OFF Indicates there is
something incorrect
with the main PCBA’s
program.
Replace the main
PCBA.
8 “General System
Error”
ON/ON/OFF Indicates one of the
internal power supplies
is out of range.
Adjust the input power
supply voltage to
within range for the
sensor configuration.
Replace the main
PCBA.
5 “Internal Circuit Fault” ON/ON/OFF Indicates a hardware
failure on the main
PCBA.
Replace the main
PCBA.
33 “Lamp Fault” ON/ON/OFF Indicates the sensors
lamp is not operating
properly. (XIR PLUS
sensors only)
Replace the sensor.
15 “Life and Health Fault” ON/ON/OFF Indicates the sensor is
at the end of life.
Recalibrate the sensor
to get additional life. If
error does not clear
after recalibration,
replace the sensor.
36 “Low Signal Failure” ON/ON/OFF This indicates the
sensors output is low.
Clean the optics on the
sensor or replace the
sensor.
1 “Supply Voltage Fault” ON/ON/OFF The input power
supply is out of the
operating range. It may
be too low or too high.
Check the input power
supply is within range
for the sensor
configuration.
17 “Negative Drift” ON/ON/OFF This indicates the
sensor is reading
downscale.
Recalibrate the sensor.
26 “Negative Supply
Fault“
ON/ON/OFF Indicates the negative
power supply is out of
range.
Check the input power
supply. If this is within
range, then replace the
sensor.
N/A “Over Range” ON/ON/OFF An over scale gas
reading is present.
Verify the area is clear
of gas first then
recalibrate the sensor.

Appendix A
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Priority1 Display Message Status LEDs (G/Y/R) Description Resolution
31 “Parameter out of
range”
ON/ON/OFF Indicates that a setting
is improperly set in the
unit.
Select Controll Data
Reset from Instrument
menu. Verify any
customer settings.
Then recalibrate the
sensor.
2 “RAM Checksum
Fault”
ON/ON/OFF Indicates a bad RAM
memory location was
detected.
Replace the main
PCBA.
34 “Reference Failure” ON/ON/OFF Indicates an out of
range measurement.
Replace the sensor.
6 “Relay Fault” ON/ON/OFF Indicates that a
problem with the relays
was detected.
Replace the relay
options PCBA.
22 “Sensor Configuration
Reset”
ON/ON/OFF Indicates the sensor
datasheet was reset.
Calibrate the sensor.
12 “Sensor Element Error” N/A Indicates the sensor is
broken.
Replace the sensor.
38 “Sensor End of Life
Fault”
ON/ON/OFF Indicates the sensor is
at the end of life. (excl.
TruCal Sensors)
Recalibrate the
sensor/replace the
sensor.
27 “Sensor FLASH Error” ON/ON/OFF Indicates there is
something wrong with
the sensors program.
Replace the sensor.
13 “Sensor Heater Fault” ON/ON/OFF Indicates the sensors
heater is not working
properly.
Replace the sensor.
25-40 “Sensor Internal Fault” ON/ON/OFF Indicates the detection
of a hardware issue in
the sensor.
Replace the sensor.
9 “Sensor Missing” ON/ON/OFF Indicates the sensor is
no longer detected.
Replace the sensor.
28 “Sensor RAM Error” ON/ON/OFF Indicates a bad RAM
memory location was
detected.
Replace the sensor.
10 “Sensor Supply
Voltage Fault”
ON/ON/OFF Indicates the sensors
input voltage is out of
range.
Check the input power
supply voltage and
check the wiring to the
sensor module for
damage. If this does
not resolve the issue,
replace the sensor.

Appendix A
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Priority1 Display Message Status LEDs (G/Y/R) Description Resolution
20 “Span Calibration
Fault”
ON/ON/OFF Indicates the sensor
did not pass the Span
calibration operation.
Acknowledge the fault
by pressing and
holding both EZ touch
buttons at the same
time for up to 5
seconds. The unit will
revert to the previous
calibration so that the
unit can continue to
detect gas while
troubleshooting fault.
Causes for this fault
include:
(1) Span gas is not
applied within the
calibration time-out
period.
(2) The incorrect span
gas is applied or
the span value is
not set correctly in
the Sensor
Settings.
(3) The sensor is at its
end of life.
Check the span gas
concentration and the
sensor span value
setting to ensure that
the correct span gas is
being used. Go
through the calibration
process again after
verifying. If fault
persists, replace the
sensor.
14 “TEDS CRC-16 Error” ON/ON/OFF Indicates the sensors
datasheet is invalid.
Reset the sensor.
Verify the sensor
settings (if different
from default), then
recalibrate the sensor.
40 “Unknown Error” ON/ON/OFF Indicates that a sensor
is returning an
unknown error
condition.
Replace the sensor or
update the main PCBA
software.