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Discontinued. Not for sale. Recommended: MPS Flammable Gas Monitor

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ST-48 Propane Combustible Gas Monitor-Discontinued

Item : 95133 | Discontinued

Product Summary

The ST-48 Combustible Gas Monitor is ideal for facilities that require continuous monitoring of propane. The enclosure is specifically designed to prevent an explosion. The monitor is well suited for environments such as warehouses, heating and cooling, alternative fueling stations, and any locations requiring LEL gas monitoring for combustible gases. The monitor is housed in a NEMA 4 explosion-proof enclosure suitable for Class 1, Group B, C, and D, Class 2, Group E, F, and G. PureAire’s durable, long-life LEL catalytic sensor will last 5-6  years in a normal environment without needing to be replaced.

Please note that this product is no longer available. 

For LEL Gas Detectors, please see PureAire’s MPS Flammable Gas Monitor  

  • LEL Combustible Gas Analyzer with 0-100% or 0-4% of LEL
  • Designed for Combustible Gases including Propane
  • Gas Sampling for Vessels or General Safety with Wall Mount
  • Explosion-Proof Enclosure
  • Non-Intrusive Calibration
  • Local Digital Display
  • 4-20 mA Analog Output
  • 2 Configurable High/Low Relays
  • Long Life LEL Catalytic Sensor Average, 5-6 years

The ST-48 LEL gas detector is housed in a NEMA 4 Explosion Proof Enclosure and is available for propane (C3H8). Capable of monitoring the percentage of LEL combustible gas, the ST-48 is a perfect monitoring solution for providing worker protection in warehouses, agricultural facilities, alternative fueling stations, the oil and gas industry, and other areas requiring hazardous monitoring for propane.

The instrument’s fault supervision circuitry continuously monitors for failed sensor cell and communication. Our sensor cell operation is continuously supervised 24/7, and when used with distributive control systems or PLCs, the monitor provides immediate fault identification.

 

Sampling Method Diffusion Cell
Gases Detected Hydrogen Sulfide (H2S)
Ethanol (C2H5OH)
Ethane (C2H6)
Ethyl Alcohol (C2H5OH)
Ethylene (C2H4)
Isopropyl alcohol (IPA)
Methyl Alcohol (MeOH)
Accuracy ± 1 % of Reading
Operating Temperature -32 to +50 ºC
-25 to +122 ºF
Display 3 1/2″ Digit LCD Digital Display
Sensor Type LEL Catalytic Bead
Sensor Life 2 to 5 years under Normal Conditions
Signal Outputs 2 alarm relays, 4-20 mA analog output, and fault relay
Power Requirements 2 24 VDC
3 Wire
Width 5.12 in
130.05 mm
Height 5.0 in
127 mm
Depth 8.0 in
203.2 mm
Weight 4.7 lb
2.1kg
Enclosure Nema 4 Explosion Proof Suitable for Class 1, Group B, C, & D

1 Contact PureAire for more gases
2 48 V DC, 3 Wire Available for LEL and Hydrocarbon Gases.

Additional LEL Monitor Accessories List Price
8 Channel Controller $2,595.00 US (P/N # 99058)
Horn and Strobe  $160.00 US (P/N # 42002)
Remote Display $375.00 US (P/N # 99091)

Self-Supervised Operation
The PureAire ST-48 Propane Combustible Gas Monitor incorporates sophisticated electronics that, when used in conjunction with distributive control systems or PLC’s enable you to quickly identify and correct major system faults. These enhanced self-diagnostic capabilities include missing cell and broken transmitter wiring. Should a system error occur, the ST-48 Combustible Gas Monitor outputs a 0 mA signal to remote alarm/control systems to immediately alert control room personnel.

ST-48 Propane Combustible Gas Monitor Literature

ST-48 Manual 

Gases Detected with PureAire Monitors

LEL Combustibles Layout 

LEL Monitor Layout 

LEL Monitor with Fan Relay 

Continuous Monitoring

Provides 24/7 detection to help identify hazardous conditions early.

Clear Alarm Workflows

Designed to support fast response with monitoring and notification capabilities.

Industrial Applications

Useful in facilities where combustible or toxic gases may be present.

Integration Ready

Fits typical facility alarm and monitoring workflows.

Oxygen deprivation is a silent killer. Oxygen-depleting gases, such as nitrogen, argon, and helium, are odorless and colorless, making leaks impossible to detect, unless appropriate monitoring is in place.

PureAire oxygen deficiency monitors can be used to monitor nitrogen, argon, and helium. Carbon dioxide can also be monitored with PureAire’s dual oxygen/carbon dioxide monitor.

PureAire uses a proprietary, non-depleting, zirconium oxide sensor that will last up to 10 years in a normal environment without needing to be replaced.

PureAire’s sensors do not operate under partial pressure, meaning that a PureAire sensor will not need to be adjusted to account for different elevations. Additionally, the sensors will not drift due to changes in barometric pressure.

In contrast, other gas detection companies use depleting, electrochemical sensors. These sensors, because they are depleting, operate for 1-2 years before needing to be replaced. Electrochemical sensors do not offer long-term solutions to companies committed to safety.

PureAire sensors are built to last 10 years. Often, the sensors work much longer. In fact, some of our first customers who started using PureAire products in 1997 report that the sensors are still in operation today.

On the other hand, an oxygen monitor that uses a depleting, electrochemical sensor is like a battery in that, as the sensor depletes, it begins to lose its power and responsiveness. In order to operate accurately, electrochemical sensors must be calibrated frequently.

PureAire sensors are made of non-depleting zirconium oxide, and calibration is typically not required.

However, a visual check of the monitor should be done once a year to verify that the sensor is functioning properly, and span adjustments should be done, as necessary. The sensor requires periodic testing with nitrogen to verify the sensor’s response to low oxygen levels.

In contrast, electrochemical sensors, because they deplete over time, will need to be calibrated every 2-3 months and totally replaced every 1-2 years.

Switching to a PureAire non-depleting, zirconium oxide sensor will save you time and money, while ensuring the safety of your workers and facility.

Electrochemical sensors offered by other gas detection companies lose accuracy over time and must be calibrated. Calibration recharges and resets the monitor to get an accurate reading. It is important to note that an electrochemical sensor can only be calibrated a finite number of times before it must be discarded.

PureAire’s non-depleting zirconium oxide sensor will not experience drift. Oxygen sensors from PureAire will provide long-lasting, reliable, and accurate monitoring for an average of10+ years.

The oxygen monitor covers an area of approximately 692 square feet when mounted on a wall and should be placed no more than 21 feet from potential leak sources such as gas lines, gas cylinders, or any areas where a gas leak might be expected to occur.

To ensure safety, the maximum distance between two monitors mounted to the same wall, should not exceed 30 feet. However, since cryogenic gases, such as argon, helium, and nitrogen, are unpredictable, we encourage you to contact PureAire for additional guidance specific to your needs.

In most circumstances, PureAire recommends that oxygen monitors be installed 3-5 feet away from gas cylinders or cryogenic gas lines. To enable employees to see the monitor display and verify its performance, PureAire recommends mounting an oxygen monitor 3-5 feet off the ground.

There are other options for mounting an oxygen monitor. For instance, PureAire sensors can sample the air from up to 100 feet away, or be installed within a glovebox, freezer, sealed chamber, or even underground. PureAire monitors can also work in environments that require KF-25 flanges, as well as in nitrogen/argon enriched environments.

PureAire’s Sample Draw Monitors pull a sample flow at a rate of 250 ccs per minute. We recommend using 1/4” OD x 3/16” ID polypropylene sample tubing. Using this internal tubing dimension, to calculate transport (response) time, add 2 seconds per foot of sample tubing. For example, if the sample tube is 10 feet long, the initial response time would be 20 seconds (10ft x 2seconds=20seconds) at 15 feet the response time would be 30 seconds (15ft x 2seconds=30seconds), etc.

The response time when using the entire 100 feet of sample tube will take 3.5 minutes (100ft x 2seconds=200seconds or 3.5minutes) for the sample to reach the monitor.