General Monitors 51457-1 H2S Gas Sensor | Seven Star LLC
Overview
The General Monitors 51457-1 H2S sensor is a toxic gas sensor for hydrogen sulfide detection from the General Monitors range of gas detection products, now part of MSA Safety. The official MSA datasheet for General Monitors H2S gas sensors identifies part number 51457-1 as an H2S sensor with a measuring range of 0-100 ppm, and the original listing describes the item as a TGD (toxic gas detection) sensor, range 0-100 ppm, part number 51457-1, supplied as part of a fire and gas detection system.
The 51457-1 H2S sensor is used to protect personnel and plant in environments where hydrogen sulfide can be present, such as oil and gas production, refining and wastewater treatment, by continuously measuring the gas concentration and driving alarms when the level exceeds the set point.
Engineering & Design
The 51457-1 is an electrochemical H2S sensor element designed for use with General Monitors gas detection transmitters, where it converts the gas concentration into an electrical signal for the transmitter electronics. In the General Monitors H2S sensor range, the 51457 series covers the 0-100 ppm, 0-50 ppm and 0-20 ppm measuring ranges (51457-1, 51457-5 and 51457-9 respectively), with the -1L and -5L variants for low temperature operation.
The sensor is installed in the gas detection transmitter head in the field, where it is exposed to the atmosphere being monitored. Accessories such as increased safety housings (for example polyester Ex e housings for ATEX applications) are available from the same product range to suit the hazardous area classification of the installation.
Key Features
- General Monitors (MSA) 51457-1 H2S sensor for toxic gas detection
- Measuring range 0-100 ppm (per official MSA datasheet and original listing)
- Electrochemical detection of hydrogen sulfide
- Sensor element for General Monitors gas detection transmitters
- Part of a fire and gas detection system per the original listing
- Replacement part for existing General Monitors installations
Applications
- The 51457-1 H2S sensor provides H2S monitoring in oil and gas production facilities
- Toxic gas detection in refineries and petrochemical plants
- Personnel protection in sour gas and wastewater applications
- Replacement sensor for General Monitors H2S detectors
Specifications
| Manufacturer | General Monitors (MSA Safety) |
| Part number | 51457-1 |
| Type | H2S toxic gas sensor (electrochemical) |
| Measuring range | 0-100 ppm |
| Application | Fire and gas detection systems (per original listing) |
| Related parts | 51457-5 (0-50 ppm), 51457-9 (0-20 ppm), low temperature variants -1L/-5L |
Compatibility & Integration
The 51457-1 H2S sensor is the replacement sensing element for General Monitors H2S detection transmitters, and it is installed in the detector head where the atmosphere is sampled. When replacing a sensor, follow the transmitter calibration procedure so the system remains accurate, and confirm the measuring range of the installed transmitter matches the sensor range.
Before ordering, confirm the transmitter model and the required measuring range of your installation. Our team can verify the part number and compatibility against your system before dispatch.
Ordering Information
To order the General Monitors 51457-1 H2S sensor from Seven Star LLC, quote the part number and your detector details. We confirm availability and delivery to your site in Oman or anywhere in the GCC, and we verify the part against your gas detection system before dispatch.
Why Seven Star LLC
Seven Star LLC supplies gas detection sensors and safety instrumentation to industrial customers across Oman and the wider GCC region. Every General Monitors 51457-1 sensor we supply is checked against the part number before dispatch, and our team confirms the sensor matches your detector before you order.
FAQ
What is the General Monitors 51457-1?
The 51457-1 H2S sensor is a General Monitors (MSA) toxic gas sensor with a measuring range of 0-100 ppm, per the official MSA datasheet and the original listing.
What is the measuring range of the 51457-1?
The measuring range is 0-100 ppm of hydrogen sulfide; the related 51457-5 and 51457-9 cover 0-50 ppm and 0-20 ppm respectively.
What type of sensor is the 51457-1?
It is an electrochemical H2S sensor element used with General Monitors gas detection transmitters, identified as a TGD sensor in the original listing.
Can the 51457-1 be used in hazardous areas?
The sensor is used with the General Monitors detector range, for which increased safety housings are available (e.g. polyester Ex e housings for ATEX), matching the hazardous area classification of the installation.
How do I order the 51457-1 sensor?
Quote the part number and your detector details to Seven Star LLC, and we confirm availability, compatibility and delivery to your site in Oman or anywhere in the GCC.
Related Products
General Monitors, now part of MSA Safety, is a globally recognized brand specializing in gas and flame detection technologies for hazardous industrial environments. For over 50 years, the company has been at the forefront of industrial safety innovation, providing reliable monitoring solutions that protect people, equipment, and facilities from explosive and toxic gas risks.
Its advanced product portfolio includes fixed gas detectors, flame detection systems, ultrasonic leak detectors, and integrated safety monitoring solutions designed for oil & gas, petrochemical, and power generation applications. General Monitors products are known for their accuracy, fast response, and robust construction that ensures reliable performance even in extreme conditions.
Seven Star LLC supplies genuine General Monitors detection systems to clients across the Middle East, delivering certified safety solutions backed by MSA’s engineering excellence and Seven Star LLC’s trusted regional support.
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