EMS TOM-2B User manual

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
1
Operators Manual
For Part Number TOM-2095B
TOM-2 Total Oxidizer Monitor w/Mitigation
1370 Harlan Street
Lakewood, CO 80214
303-952-5043
www.EMSHealthcareLLC.com

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
2
Table of Contents
System Overview........................................................................................................................................ 3
Models......................................................................................................................................................... 3
System Specifications................................................................................................................................. 4
System Installation...................................................................................................................................... 5
Facility Requirements............................................................................................................................. 5
Facility Wiring........................................................................................................................................ 6
Mitigating Gas ........................................................................................................................................ 7
Initial Power Application........................................................................................................................ 7
System Operation........................................................................................................................................ 9
System Configuration ............................................................................................................................. 9
Settings.................................................................................................................................................... 9
Sensor Calibration................................................................................................................................. 12
Statistics................................................................................................................................................ 13
Faults..................................................................................................................................................... 14
Data Trend ............................................................................................................................................ 15
Data Logging ........................................................................................................................................ 15
LOGA01 Data Table - Example ........................................................................................................... 16
LOGA02 Data Table - Example ........................................................................................................... 16
System Maintenance................................................................................................................................. 18
Annual Compliance Reporting ............................................................................................................. 18
Periodic Sensor Check.......................................................................................................................... 18
System Troubleshooting ........................................................................................................................... 18
O2 Concentration at Vacuum Pressure................................................................................................. 18
Password Screen ................................................................................................................................... 18

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
3
System Overview
With the introduction of NFPA 99 2012 edition came an entirely new requirement for medical-surgical
vacuum systems that are also used for Waste Anesthetic Gas Disposal (WAGD). For these combined-use
systems, the NFPA now requires the total concentration of oxidizers (oxygen and nitrous oxide) be
maintained below 23.6 percent or the materials, lubricants, and sealants within the vacuum pump be inert
to these oxidizers for new installations (reference section 5.1.3.8.1.2. (2)). The NFPA 99 2018 edition
imposes this requirement on all (existing and new) combined-use vacuum systems and the 2021 edition
removes nitrous oxide from the requirement.
The TOM-2 Total Oxidizer Monitor (patent pending) from EMS Healthcare, LLC is a gas monitoring and
mitigation system that’s ideal for the continuous regulation of oxygen below the limit of 23.6 percent in
combined-use vacuum systems. The heart of the monitoring & mitigation system is a PLC that interfaces
to an oxygen sensor, a vacuum transducer, and a control valve. The unit monitors oxygen concentration
and vacuum pressure and takes appropriate action based on these input parameters. The PLC will operate
a valve plumbed to a regulated gas source (e.g., carbon dioxide or nitrogen) or ambient air to maintain
levels below the critical threshold of 23.6%. Maintaining system vacuum pressure is always prioritized
over oxygen levels; as long as vacuum pressure remains acceptable, increasing oxygen levels to the
vacuum pump inlet will be mitigated.
Models
The TOM-2B (part number TOM-2095B) performs both oxygen monitoring and mitigation and is
recommended for use in both in-patient and out-patient facilities where oxygen concentrations may exceed
the NFPA 99 threshold of 23.6%. The TOM-2B continuously monitors and logs total oxygen
concentration in order to provide periodic reports for compliance purposes.
The TOM-2B features a zirconium oxide O2 sensor with a life span of 10 years of continuous operation.
Sensor behavior is very stable under nominally changing environmental conditions of temperature,
pressure, and humidity. Because of its stability, the sensor requires only periodic testing to verify the
sensor remains calibrated for accuracy.

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
4
System Specifications
Part Number
TOM-2095B
Description
Oxygen monitoring and mitigation, vacuum pressure monitoring, alarm relay
output, data logging
Performance
Response Time
Within 1 second of any change in oxygen levels
Accuracy
± 0.5% of FS
Repeatability
± 1% of reading
Operating Temp
-40° to 122°F (-40° to +50°C)
Humidity
0 –98% RH, non-condensing
Data Logging
Oxygen concentration and Vacuum Pressure readings logged every 10 seconds
Alarm Output
2-wire dry contact, normally closed (open on alarm of 23.6% O2)
Oxygen
Monitoring
Range
0 –95% oxygen concentration
Sensor Connection
1/2”NPT male threaded connection
(connectorized 5m signal cable to control unit)
Vacuum
Pressure
Monitoring
Range
0 –30 in Hg, vacuum range
Sensor Connection
1/4”NPT male threaded connection
(connectorized 5m signal cable to control unit)
Gas
Mitigation
Gas Type
Carbon dioxide, nitrogen or ambient air (with included muffler)
Gas Pressure
5 –10 psig (operating pressure range at valve inlet port)
Gas Connection
1/2”NPT female threaded connection
Valve Power
Power supplied by control unit
(10 ft cord to control unit)
Electrical
Voltage Source
110-120 VAC, 60 Hz
Power (max)
19 Watts including solenoid valve and transducers
Physical
(Control
Unit)
Dimensions
8”(W) x 12”(H) x 6”(D)
Weight
10.0 pounds (4.5 kg) including solenoid valve and transducers
Enclosure Type
NEMA 1,2,4,4X rated, polycarbonate, indoor/outdoor use

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
5
System Installation
Facility Requirements
TOM-2B installation must be performed by a qualified technician trained by EMS Healthcare LLC.
The TOM-2B comes pre-wired with an oxygen concentration monitoring sensor on a connectorized 5-
meter cable, a vacuum pressure sensor on a connectorized 5-meter cable, and a solenoid-operated
mitigation valve on a 5-meter hardwired cable for installation into the facility vacuum system.
The TOM-2B enclosure should be mounted vertically on or near the vacuum pump skid to allow
installation of the sensors and valve into the facility vacuum system as indicated in the diagram below.
See Specifications for enclosure dimensions.
NOTE: The mitigating valve must be installed at least 1 meter upstream of the O2 sensor to allow
proper mixing of the mitigation gas. The vacuum transducer should be installed 1 meter (if possible)
upstream of the mitigating valve to monitor patient-side vacuum levels during mitigation. If there are
questions during installation, contact EMS Healthcare for installation guidance.
PUMP
PUMP
WAGD
from
Facility
Exhaust
O2
Pv
Mitigating
Gas
Receiver
Tank

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
6
Facility Wiring
Electrical installation must be performed by a qualified electrician.
1. Power Input - The TOM-2B requires 110VAC electrical power (2-conductor plus ground) wired
into it. The power input connections are to be made at terminal blocks inside the unit enclosure.
2. Solenoid Valve Wiring –The TOM-2B comes with a type-LB conduit body and wire nuts for
completing wiring terminations at the solenoid valve electrical interface. The solenoid valve
operates with 24VDC so the RED (V+) and BLACK (V-) wires from the TOM-2B unit should be
connected to the RED wires at the solenoid. The WHITE wire from the TOM-2B is a grounding
wire and should be connected to the GREEN wire at the solenoid interface.
3. O2 Alarm Relay Output –The TOM-2B includes an O2 Alarm relay output (2-wire dry contact,
normally closed) that can be wired to the facility master alarm panel. This relay output will open
when an O2 Alarm is indicated (23.6% O2 is exceeded) or when a loss of 110VAC power to the
unit occurs. See below for where these connections can be found within the TOM-2B enclosure.
Insert 110VAC armored cable
(or equivalent) wiring thru left
wiring port
Hot/Black Wire to
Circuit Breaker input
Ground/Green Wire to
Green/Yellow Ground Terminal
Neutral/White Wire
to White Terminal

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
7
.
Mitigating Gas
The mitigation of high oxygen levels can be implemented with ambient air, carbon dioxide gas, or nitrogen
gas.
For in-patient facilities, the combined WAGD systems typically have large system volumes such that,
when oxygen is introduced into the system, its contribution to the overall percentage of gases is small and
easily mitigated by dilution in the total system volume or by introduction of a small amount of mitigating
gas. Therefore, ambient air is suggested as the initial mitigating gas for these in-patient facilities. The
TOM-2B comes equipped with an air inlet filter/muffler on the solenoid valve for installations where
ambient air will be used. After installation, if the system shows recurring O2 alarms with ambient air
mitigation, carbon dioxide or nitrogen may be required as a mitigating gas.
For out-patient facilities and surgery centers, the rise rate and peak level of oxygen concentration in the
system during facility use can be much higher than what is seen in an in-patient facility due to smaller
system volumes. Therefore, it is suggested that these facilities use carbon dioxide or nitrogen as a
mitigating gas to more rapidly respond to increasing oxygen levels detected by the TOM-2B. See the
Specifications page for gas connection sizing and acceptable pressure input levels if carbon dioxide or
nitrogen gas will be used.
The mitigating gas valve should be installed at a point where all vacuum system input is consolidated to
one line upstream of the vacuum pumps. Larger valve sizes (3/4” and 1”) are available if the vacuum
pump system requires higher flow.
Initial Power Application
On initial application of 110VAC power following system installation, the system will power up with
initial settings entered from the factory. The touch screen on the front cover of the unit will power on and
show the TOM-2B MAIN PANEL. Verify that the following steps occur automatically:
1. Initial System Mode indicates “WARMING UP”and then transitions to “MONITORING”after
about 2 minutes.
Q1 and COM1 are the
O2 Alarm relay output
terminals

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
8
2. Once System Mode indicates “MONITORING”, O2% and Vacuum Pressure readings are
displayed.
Once the unit is operational, the installer should baseline the O2 sensor concentration for the facility
location and altitude. This is done by exposing the sensor to ambient air for at least 2 minutes and
recording the concentration reading. This baseline reading can then be used to ensure the O2 sensor is
not drifting during annual maintenance checks. Refer to “Periodic Sensor Calibration” under the System
Maintenance section in this manual for the calibration process.
TOM-2B MAIN Screen
ALRM STATUS
NO ALARM (green) = O2 levels
are being maintained below
alarm limit
ALARM (red) = O2 level has
exceeded alarm limit
O2 STATUS
IN RANGE (green) = O2 is in
expected range
TOO HIGH (yellow) = O2 is at
elevated levels, mitigation is
activated
SYS HEALTH
NO FAULTS (green) = healthy
FAULT (red) = system has
detected one or more faults
22.1“Hg
14.2 %
INPUTS
O2 SENSR = absolute oxygen
concentration (1 –95%)
VAC PRESS = vacuum
pressure (0 –29 in Hg)
VACUUM STATUS
IN RANGE (green) = vacuum pressure is in range
for mitigation (MITIGATE mode only)
TOO LOW (yellow) = vacuum pressure is too low
for mitigation (MITIGATE mode only)
SYS MODE
WARMING UP (blinking yellow) = system is
warming up (approx. 2 minutes)
MONITORING (green) = system is
monitoring nominal O2 levels
MITIGATING (blinking green) = system is
mitigating elevated O2 levels
MONITOR ONLY (yellow) = system is in
“monitor only” mode –no mitigation

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
9
System Operation
System Configuration
The TOM-2B provides a touch screen display interface that allows the user to monitor system operations
and adjust configuration settings as needed. TheMAIN screen (as shown above) allows access to Settings,
Calibrations, real-time data trending, system statistics, and system faults by pressing MENU on the
display. The MENU screen (shown below) also displays the date/time and the software version loaded
into the PLC.
MENU Screen
Settings
Access to this screen is password protected to prevent unauthorized personnel from changing system
settings after initial system installation.
The Settings screen (below) enables the operator to modify settings for the mitigation solenoid valve
operation setpoints and vacuum override as well as change the TOM-2B mode (monitor only or mitigate)
and reset system statistics.

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
10
SETTINGS Screen
1. Limits –This section describes the limits and recommended settings based on the type of facility
the unit is installed in. All settings will remain active even after a power reset.
a. O2 Monitoring
i. The TOM-2B continuously monitors O2% levels against the alarm limit thresholds.
1. O2% - This measurement shows instantaneous O2 concentration values and
is used by the PLC to determine when mitigation is required. This
measurement is shown on the MAIN screen and on the TREND CHART
screen. Min/max values can be found on the STATS screen.
2. O2% Filtered –This measurement is generated by averaging O2% values
over a 60 second period and is used to determine when to trigger the O2
alarm. This measurement is shown on the TREND CHART screen and
min/max values can be found on the STATS screen.
ii. If the system detects an O2% above the O2 Alarm limit for a sustained period of
time (O2% Filtered), the system will open the O2 Alarm relay, sending an
indication to the Master alarm panel if this relay output is wired to the facility panel.
If this situation occurs, the facility should develop a procedure to physically
monitor the vacuum system pumps, inspect the O2% reading on the TOM-2B and,
if the reading is below the O2 alarm limit of 23.6%, reset the O2 alarm. Then
contact the TOM-2B installation agency for further evaluation of the system to
understand the cause and determine whether TOM-2B setting adjustments are
required.
b. O2 Mitigation settings (Mitigation mode only)
i. O2 Mitigation is only enabled when vacuum system pressure is above the Vacuum
Override limit (factory default setting is 15.0 in Hg). The operator can adjust
mitigation valve Open Setpoint, Close Setpoint, and Min Open Time settings based
on facility vacuum system design. These settings should be adjusted to provide
sufficient time for the mitigation process to affect the oxygen levels and avoid an
O2 alarm situation. The factory default settings have been evaluated under test and
should be acceptable for use in most facilities.
15.0
20.0
10.0
19.8

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
11
ii. The initial Open Time is set at 10 seconds. This setting can be modified by touching
the value window (a pop-up window will appear to adjust the value; once a new
value is input, press ENTER).
iii. Initial Open Setpoint is 20.0% O2 concentration and can be adjusted by operator.
This setting can be modified by touching the value window (a pop-up window will
appear to adjust the value; once a new value is input, press ENTER).
iv. Initial Close Setpoint is 19.8% O2 concentration and can be adjusted by the
operator. This setting can be modified by touching the value window (a pop-up
window will appear to adjust the value; once a new value is input, press ENTER).
v. Mitigation operation - when the Open Setpoint is exceeded (O2% value is higher
than setpoint), System Mode on the MAIN screen will indicate MITIGATING in
blinking green; otherwise, it displays MONITORING in solid green.
1. Solenoid valve output is activated for a time period specified by the Open
Time setting.
2. Once the Open Time expires and the O2% is confirmed to be below the
Close Setpoint, the valve is closed.
3. If O2% level remains above the Open Setpoint after the Open Time expires,
the valve will remain open until the O2% level drops below the Close
Setpoint.
4. If vacuum pressure level falls below the minimum vacuum level setting
when O2 mitigation is active, the solenoid valve output will be immediately
deactivated and remain deactivated until vacuum level rises above the
minimum limit (plus 0.5 in Hg for valve on/off hysteresis).
c. Vacuum Override setting (Mitigation mode only)
i. Vacuum Override is used internally by the O2 mitigation algorithm in order to
prioritize vacuum system pressure over O2 mitigation. If the vacuum system
pressure falls below this minimum pressure limit, all O2 mitigation activity will be
disabled until vacuum pressure returns to a value above the minimum limit. There
is no alarm output from the device for this indication because the vacuum system
controller already has such an alarm.
ii. Initial value for the alarm is 15.0 in Hg and can be adjusted by the operator. This
setting can be modified by touching the value window (a pop-up window will
appear to adjust the value; once a new value is input, press ENTER).
iii. When the vacuum override setting is exceeded (pressure falls BELOW the limit),
System Mode on the MAIN screen will display MONITORING; otherwise, it
displays MITIGATING in blinking green when mitigation is active and vacuum
pressure is within limits.
2. Monitor/Mitigate Mode - The system operates in monitor only or mitigation modes. The Settings
screen shows Monitor Only Mode or Mitigate Mode depending on the setting.
a. Press MONITOR ONLY MODE to change setting to MITIGATE MODE; likewise, press
Mitigate Mode to change back to Monitor Only Mode. The selected setting will remain
active even after a power reset.
b. In MONITOR ONLY MODE, the system continuously monitors oxygen levels and
provides O2 alarm indications. In this mode, only the O2 sensor input is required.

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
12
c. In MITIGATE MODE, the system monitors oxygen and vacuum pressure levels and
mitigates elevated O2 levels by opening a mitigating gas valve. In this mode, the O2
sensor input, vacuum pressure input, and solenoid valve output are required. Once
selected, MITIGATE MODE will remain selected even after a power reset.
3. Reset Statistics –The system generates statistical operating data which is displayed on the
STATS screen. Press the RESET STATS button to clear all existing statistics from memory and
begin generating new data.
a. This button should only be pressed when the operator knows existing statistics contain
data generated during events NOT representative of normal facility operations, like initial
system installation and checkout, or power interruption, or sensor calibration.
Sensor Calibration
Access to this screen is password protected to prevent unauthorized personnel from changing system
settings after initial system installation.
The Calibration screen (below) enables the operator to add/modify value offsets for the O2 sensor and the
Vacuum pressure sensor.
CALIBRATION Screen
1. O2 Sensor Offset Input
This field allows for O2 sensor reading adjustment as part of regular TOM-2B system
maintenance. Adjustment should only be performed by qualified personnel trained by EMS
Healthcare LLC.
a. O2 sensor OFFSET can be adjusted up/down from default of 0.0
14.2
22.1
0.0
0.0
CAUTION: once RESET STATS is pressed, all existing statistical data is erased and can no
longer be retrieved

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
13
2. Vacuum Pressure Offset Input
This field allows for vacuum pressure sensor adjustment as part of regular TOM-2B system
maintenance. Adjustment should only be performed by qualified personnel trained by EMS
Healthcare LLC.
a. Vacuum pressure sensor OFFSET can be adjusted up/down from default of 0.0
Statistics
The Statistics screen (below) enables the operator to review system statistics that are generated during
nominal facility operations.
STATS Screen
1. O2% Minimum and Maximum readings –these values represent the lowest and highest system
readings for O2% values since the system was started or the STATS RESET button was last
pressed.
2. O2% Filtered Minimum and Maximum readings –these values represent the lowest and highest
system readings for O2% filtered values since the system was started or the STATS RESET
button was last pressed.
3. Vacuum Pressure Minimum and Maximum readings –these values represent the lowest and
highest readings for Vacuum Pressure values since the system was started or the STATS RESET
button was last pressed.
4. O2% Ambient Maximum –this value represents the highest reading for O2% generated during
the three hours from midnight to 3am. For a surgery center, O2% Ambient Maximum represents
the highest level of ambient O2 levels in the vacuum system when the facility is not being used
for patient procedures. This value is currently not used by the mitigation algorithm and is only
collected for facility diagnostics.
5. O2% Rate Maximum –this value represents the highest increasing rate of O2% that the system
detected. This value is currently not used by the mitigation algorithm and is only collected for
facility diagnostics.
3.5%
21.2%
20.6%
6.2%
15.3”Hg
26.5”Hg
15
16.1%
1.2%/sec

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
14
Faults
The Faults screen (below) enables the operator to evaluate system faults and alarms that are generated
during facility operations.
FAULTS Screen
1. Vacuum Pressure Input –this indicator is GREEN as long as the sensor and interfacing cabling
is healthy. If the PLC detects an issue with the sensor or cabling, this indicator will change to
RED. If the indicator is RED, press the RED square to see the status word for this fault. If the
indicator is RED, use of the mitigation valve is disabled until the indicator is restored to GREEN.
Status
Description
Analog Input Value
0
Operating normally
Current analog input value
1
Converting data
Undefined value
2
Initializing
0
3
Parameter setting error
Correct value before the error occurred
4
Reserved
-
5
Wiring fault (out of max range)
Maximum value
6
Wiring fault (out of min range)
Minimum value
2. O2 Sensor Input –this indicator is GREEN as long as the sensor and interfacing cabling is
healthy. If the PLC detects an issue with the sensor or cabling, this indicator will change to RED.
If the indicator is RED, press the RED square to see the status word for this fault. If the indicator
is RED, use of the mitigation valve is disabled until the indicator is restored to GREEN.
Status
Description
Analog Input Value
0
Operating normally
Current analog input value
1
Converting data
Undefined value
2
Initializing
0
3
Parameter setting error
Correct value before the error occurred
4
Reserved
-
5
Wiring fault (out of max range)
Maximum value
6
Wiring fault (out of min range)
Minimum value

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
15
3. O2 Alarm Triggered
a. The O2 alarm limit is set at 23.6% as dictated by NFPA 99 and cannot be adjusted by the
operator.
b. When the alarm limit is exceeded with persistence (value is higher than limit for a sustained
period of time), ALARM in red is set on the MAIN screen and O2 ALRM TRIGGERED
will change from green to red on the FAULTS screen.
c. When O2 ALRM TRIGGERED is indicated, the O2 Alarm relay output will remain
latched ON (relay is open) until the operator resets it.
4. PLC Error
a. This error indicates that invalid data was found during program execution in the PLC. If
this error occurs, contact the installation agency for further troubleshooting.
5. Reset O2 Alarm
a. To reset the O2 Alarm, first ensure O2% is reading below 23.6%. If O2% is reading
nominally, then press RESET O2 ALARM. Then press MENU and select MAIN to
return to the main screen and verify that the ALARM STATUS indicator now shows NO
ALARM in green.
Data Trend
From the MAIN screen, press MENU and then press TREND CHART to view O2% for the system in a
graphical plot. The screen will show a graph of O2%, O2% Filtered, and Vacuum Pressure data from the
data log. After 60 seconds, the screen will revert back to the MAIN screen automatically. The operator
can scroll through previous data using the arrows provided.
Data Logging
The TOM-2B system utilizes a real-time logging function that writes data directly to an attached thumb
drive (provided with the unit) containing sufficient memory to record more than one year’s worth of data.
O2 level, Vacuum Pressure level, O2 Filtered, and System Mode data are logged every ten (10) seconds
to provide a time history of the TOM-2B operation for review.
The data stored in the thumb drive can be reviewed by removing the thumb drive from the unit, inserting
the drive into the USB port of a laptop computer, and importing the data as a CSV file into a spreadsheet
application. Some manipulation of the data may be required.
The TOM-2B produces two separate data logging files: LOGA1 and LOGA2. The LOGA1 file contains
O2 level, Vacuum Pressure level, O2 Filtered, and System Mode data. The LOGA2 file contains the
mitigation valve relay output data (0 = closed, 1 = open).

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
16
LOGA01 Data Table - Example
Sampling Time
O2 Lvl
Vac Lvl
O2 Filt
Sys
Mode
06/23/2022 13:16:21
168
204
172
1
06/23/2022 13:16:31
158
212
163
1
06/23/2022 13:16:41
149
218
152
1
All O2 and Vacuum Pressure readings have an implied decimal point 1 digit from the right. In the above
example, an O2 level of 168 is 16.8%. Similarly, the vacuum pressure level of 204 is 20.4 “Hg. The
System Mode values are interpreted as follows:
0 = WARMING UP
1 = MONITORING
2 = MITIGATING
3 = MONITOR ONLY
LOGA02 Data Table - Example
Sampling Time
Outputs
06/23/2022 13:16:21
2
06/23/2022 13:16:31
2
06/23/2022 13:16:41
2
Under normal conditions, a value of “2” is expected for Outputs (see table below for interpreting this
value). During elevated O2 conditions, a value of “3” is expected if mitigation demand is sufficient for
the elevated levels of O2. If mitigation cannot keep up with the elevated O2 levels, then a value of “1”
may be recorded if the O2 level exceeds the alarm limit.
Since the O2 Alarm relay is latched, once it is set it will remain set. Therefore, once normal conditions
return, a value of “0” will be recorded instead of “2” until the O2 Alarm is manually reset (see “O2 Alarm
Reset”)
Outputs
Value
TOM-2 State
Not
Applicable
(Relay 3)
Not
Applicable
(Relay 2)
O2
Alarm
(Relay 1)
Mitigation
Valve
(Relay 0)
3
Elevated O2 levels, mitigation is active
0
0
1
1
2
Normal O2 levels, mitigation is not active
0
0
1
0
1
Alarm limit exceeded, O2 level is back to
normal, mitigation remains active
0
0
0
1
0
Alarm limit exceeded, O2 level is back to
normal, mitigation is not active
0
0
0
0

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
17
Thumb drive

TOM-2 Operators Manual
Revision D, Copyright ©2022, EMS Healthcare LLC, all rights reserved
18
System Maintenance
Annual Compliance Reporting
EMS Healthcare recommends downloading the time history log from the thumb drive on an annual basis
to provide the facility a report of oxygen concentration compliance to the NFPA 99 requirement.
Periodic Sensor Check
EMS Healthcare recommends checking the O2 sensor on an annual basis to verify sensor accuracy. This
check can be conducted during the same visit when the time history log is downloaded from the unit.
To check the O2 sensor, remove the sensor from the vacuum system by unscrewing the sensor from its
port.
Leave the sensor in ambient air for at least 2 minutes and then verify the O2% is reading the same as the
baseline reading taken at initial system startup (refer to Initial Power Application under System
Installation). If the sensor is not at this value, adjust the O2 sensor offset value (refer to O2 Sensor
Calibration under System Operation) to re-calibrate it.
Once the O2 sensor has been verified, it should be re-installed into the sensor port.
System Troubleshooting
O2 Concentration at Vacuum Pressure
The O2 sensor is designed to measure O2 concentrations relative to sea-level ambient pressure of 14.7
psia. When exposed to lower pressures due to vacuum conditions, the sensor will count fewer O2
molecules and produce an O2 concentration relative to sea-level pressure. While the fractional oxygen
content in the local ambient gas remains relatively constant (e.g., 20.9% relative to other gases in the local
ambient air), the O2 concentration being reported by the sensor will decrease at ambient pressures lower
than sea-level and increase at ambient pressures higher than sea-level as it measures absolute oxygen
molecule content relative to sea-level.
Password Screen
To enter the password, use the arrow keys to move the cursor to the alpha-numeric character and then
press “enter” to add the character to the sequence. Do this to enter every character in the sequence. Once
the password has been entered, move the cursor to the “OK” key and press “enter” to accept the password.
Once the password has been entered, all screens that require the password will be open to the operator.
After 10 minutes of inactivity on the IDEC, the password-protected screens will require the password to
be re-entered.
CAUTION: do NOT unplug the sensor cable unless power to the unit has been shut off first