Sensidyne SENSALARM FLEX, User Manual

Page: 23 / 82

SensAlarm Flex
–
Universal Gas Detection System
Sensidyne Document No. 360-0257-01 (Rev A) P a g e 23 | 82
2. INSTALLATION
2.1. Location
Monitoring effectiveness will be dependent on appropriate placement of the Sensor. The SensAlarm Flex
should be mounted in proximity to any potential target gas leak sources. Local Sensors are those
installed directly to SensAlarm Flex, and in this configuration are generally used where entire rooms
should be monitored, often for oxygen depletion.
Sensors may also be mounted remotely from the SensAlarm Flex, and is generally used to accommodate
target gases that are heavier or lighter than air, or where there are mechanical connections in the target
gas delivery system, or for exhaust duct monitoring.
The SensAlarm Flex itself is often conveniently located near entrances where users can access it.
Expert consultation may be necessary to determine the most appropriate location for optimum monitoring.
In all circumstances, the plant safety officer or other appropriate personnel should be consulted before
installation.
Site determination, at a minimum, must consider the following factors:

Most probable location(s) of a hazardous target gas leak

Physical properties of the target gas (heavier or lighter than air)

Air movement due to ventilation or predominate wind direction

Environment conditions such as vibration, temperature, and humidity

Presence of interferent or cross sensitive gases (reference appropriate Sensor datasheet)

Access for routine preventive maintenance
2.2. Code Compliance
The Uniform Fire Code and International Fire Code both have evacuation requirements for buildings
during emergency conditions. These mainly concern egress safety and routes, evacuation time, and
include emergency lighting specifications. Local authorities may further define or detail these codes.
If a gas detection system alarm can result in an evacuation, or Fire Department notification, the gas
detection system may require battery or Uninterrupted Power Source (UPS) back-up power. The code
requirements for your facility will dictate the required duration for power backup situations. These
requirements provide for operational conditions during power failures, and enough time to furnish
valuable status information to users and emergency responders.
SensAlarm Flex is available with an optional battery back-up to provide 60 minutes of non-alarm
operation and at least 30 minutes of operation under alarm conditions.
2.3. Gas Monitor Installation
NOTE: Always refer to the NEC and local electrical codes to ensure compliance for proper
installation.
The SensAlarm Flex Gas Monitor mounts directly to a wall or vertical platform via four (4) mounting
holes located above and below the enclosure. Additional mounting holes are available in the center of
the enclosure mounting tabs for additional support if required. Placement should be in conspicuous
areas that are easily seen. The Gas Monitor must be mounted to a backing that will properly support the
weight of the unit.
Three (3) ¾” Rigid NPT / IMC grounding hubs are provided for wiring access. Line
power should not be run in low voltage control conductor raceways. The top Rigid / IMC grounding hub