Converting A Permit Required Confined Space to a Non-Permit Required Confined Space

29 CFR (Code for Federal Regulation) 1910.146 defines a confined space as a space that is large enough and so configured that an employee can bodily enter and perform assigned work; and has limited or restricted means for entry or exit (for example, tanks, vessels, silos, storage bins, hoppers, vaults, and pits are spaces that may have limited means of entry); and is not designed for continuous employee occupancy.

A “permit required confined space” is further defined as a confined space that contain all of the above, plus one or more of the following:

1. A substance that has the ability to engulf or asphyxiate the entrant
2. A potentially hazardous atmosphere
3. Inwardly converging walls within the space or a floor the slopes downward, tapering to a small cross-section
4. Contains any other serious safety or health hazard

With the use of Fixed Gas Detection Equipment, we can address items 1 & 2 above and convert the permit required confined space to a non-permit required confined space. We would accomplish this by monitoring the space for Combustible gases, Oxygen Deficiencies and any known toxic gases.  This can be very beneficial to the customer as it can save time, money, resources, and most importantly lifes!

Once a confined space has been identified as having any one of the above four potential hazards, an employer should identify it as such via either signs or another effective means of communication.  Any time an employer has workers that will be entering confined spaces, there needs to be a written program developed that outlines and instructs on the proper procedures for working around these spaces.  One such important procedure is drafting the actual permit for the permit required confined space. This is called the entry permit and is defined by OSHA as “the written or printed document that is provided by the employer to allow and control entry into a permit space and that contains the necessary information as required in paragraph (f) of this standard’s section.”  Paragraph (f) goes on to list an additional 14 items of information.

When converting a space from a permit required confined space into a non-permit required confined space, recommended practice is placement of the gas detection sensor inside of the confined space area with annunciation outside the entry point and within the confined area. This conifiguration provides notification for workers prior to entering the area and while working inside the confined space.

Sensidyne has several ways to accomplish the task of converting the permit required confined space to a non-permit required confined space:

SenseAlarmPlus with Remote Sensors

Confined Space Entry - SensAlarm Plus

This option allows you to remote the sensors into the space with a display of the gas reading for each sensor as well as a dual set of alarms for each sensors should it reach its threshold value (LEL, O2, any known toxics [CO/H2S]).

SenseAlertPlus with Remote Sensors

Confined Space Entry with SensAlert Plus

This option allows you to remote the sensors into the space with a display of the gas reading for each sensor as well as a dual set of alarms if any one of the sensor readings reaches its threshold value. (LEL, O2, any known toxics [CO/H2S]).

Sample Draw Gas Detection System

Confined Space Entry with Sample Draw

This option allows you pull a sample from a Class 1 Division 1 area into a Class 1 Division 2 area across the sensors and then to remote the sensor readings to a safe area where the readings can be monitored by a Gas Controller with a display of the gas reading for each sensor as well as a dual set of alarms if any one of the sensor readings reaches its threshold value. (LEL, O2, any known toxics [CO/H2S]).

Advanced Point Gas Detector for Converting A Permit Required Confined Space to a Non-Permit Required Confined Space Applications

SensAlert Plus Fixed Point Gas Monitor for Converting A Permit Required Confined Space to a Non-Permit Required Confined Space ApplicationsCompromise somewhere else. SensAlert Plus fixed point gas detector is the high-integrity gas detection transmitter designed to meet the requirements of industrial plants and facilities. Features unique to Plus Series instruments reduce maintenance burdens and minimize installation costs while providing uncompromised gas monitoring for safety-critical Converting A Permit Required Confined Space to a Non-Permit Required Confined Space applications.

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Robust Gas Detection System for Converting A Permit Required Confined Space to a Non-Permit Required Confined Space Applications

SensAlarm Plus Fixed Point Gas Monitoring System for Converting A Permit Required Confined Space to a Non-Permit Required Confined Space ApplicationsSensAlarm Plus packages an advanced gas detection transmitter, sensor head, and controller with annunciation and relay outputs in a single easy to use and easy to install package. SensAlarm Plus employs a universal sensor head that accepts combustible (infrared or catalytic), toxic, and oxygen sensors to meet the requirements of Converting A Permit Required Confined Space to a Non-Permit Required Confined Space applications.

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Converting A Permit Required Confined Space to a Non-Permit Required Confined Space Application Assistance We will help identify the Converting A Permit Required Confined Space to a Non-Permit Required Confined Space solution that best meets your application requirements.


The Application Engineering and Support team at Sensidyne spends their time entrenched in gas detection applications with customers in order to provide solutions that best meet the customer's application requirements. With over 75 combined years of experience, this team welcomes application challenges and the opportunity to serve you.

For a no commitment consultation with one of our Gas Detection Application Support Team Members, complete the form below.



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