We supply and provide application support for industrial process instrumentation product sensors and control devices. We are a manufacture's representative for a core group of well established and technologically superior industrial process instrumentation products.
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Sierra Monitor is now SMC. MSA’s SMC detection solutions address the facilities safety segment. Our SMC branded controllers, sensor modules, and software are used by safety managers to protect facility personnel and assets across thousands of facilities such as natural gas vehicle fueling and maintenance stations, wastewater treatment plants, parking garages, and underground telephone vaults.



SMC 4501-XX 2-Wire Toxic Gas Detector
SMC 5100-XX-IT Toxic Gas Detector
SMC 5100-28-IT Point Ifrared Combustible Gas Detector
The SMC 4501-XX Detector monitors toxic gases such as Hydrogen Sulfide, Carbon Monoxide, Oxygen Deficiency, Chlorine Dioxide, and others. Utilizing 2-wire loop-powered technology, the 4501-XX requires less wiring, leading to better protection from wiring errors. The 4501-XX requires minimal maintenance with a 6-month calibration cycle and continuous self-diagnostics.
The SMC 5100-XX-IT gas detector monitors toxic gases such as Hydrogen Sulfide, Carbon Monoxide, Nitrogen Dioxide, Ammonia, Oxygen Deficiency, and others. The detector requires calibration only every six months, cutting operating costs and time. As part of the SMC Sentry IT platform, the detector can be remotely diagnosed and calibrated via Remote Sensor Capability.

The SMC 5100-28-IT detector uses infrared technology, an accurate and stable gas detection method that is low maintenance and can operate in highly combustible and/or low oxygen environments. The 5100-28 IR detector is network-enabled to provide the interface needed to your plant-wide control system, whether it be 4-20 mA, Modbus, HART, relay contacts or SentryBus.

SMC 5100-02-IT Combustible Monitor
SMC 5100-88-IT for CO2 (Carbon Dioxide) Detection
SMC 4101-28 Point Indrared Combustible Gas Detector
The SMC 5100-02-IT gas sensor monitors combustible gases such as Methane, Hydrogen, Propane, and others. It is based on catalytic bead technology, a consistent and reliable method of detection that offers excellent response times to the target gases. The 5100-02-IT sensor offers multiple communication outputs including 4-20 mA and Modbus RTU.

The SMC 5100-88-IT detector monitors Carbon Dioxide, a toxic gas that can be dangerous in enclosed areas. The sensor monitors for indoor air quality to ensure a healthy, comfortable, and productive work environment. With non-intrusive calibration and remote sensor configuration, facility managers can easily calibrate and configure the sensor in hard to access areas.

The SMC 4101-28 IR Gas Detector is a ruggedized instrument designed specifically for monitoring methane in high-vibration environments. It is built to meet extreme operating conditions in remote locations. The 4101-28 is fully certified to meet the stringent and code-compliant standards of UL 2075 as outlined in the International Fire Code.
SMC 4001 Controller
SMC Sentry IT 32 Channel Controller
SMC Classic Sentry Eight Channel Controller

The SMC Model 4001 Controller is a comprehensive hazardous gas detection monitoring system designed with flexibility and features to meet specific light industrial applications, such as wastewater. Its user-friendly design makes installation and operation a simple task.

The SMC Sentry IT Controller is a powerful network-enabled hazardous gas detection system that operates up to 32 detectors and interfaces with devices over Modbus RTU, 4-20 mA, Sentry PSG Bus, and conventional dry contact. The embedded web application enables users to view important data remotely and provides connectivity into the Industrial Internet of Things (IIoT).

The SMC Sentry Classic Controller is an 8-channel gas detection system for monitoring combustible gas, oxygen deficiency, and toxic gases. It is a microprocessor-based system that includes management of gas sensors, alarm relays, user interface via front panel display, printer output, Modbus digital communication, alarm indicators, and relay outputs.

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SMC Sentry IT Retrofit SMC 20X/200X Solid State Gas Detectors Calibration Kits
SMC Sentry solutions are installed in thousands of facilities that face risks from combustible and toxic gases. New advances in sensing algorithms, protocols, web technologies and cloud connectivity can help enhance safety, reduce ongoing operational costs and provide new data driven insights. The SMC Sentry IT Retrofit makes it easy to upgrade legacy Sentry systems.
The SMC 20X/200X are single-gas detectors used to monitor combustible gas, hydrogen sulfide (H2S) or carbon monoxide (CO). The detectors are based on solid-state technology, a simple and robust method of detection capable of detecting low parts-per-million (ppm) levels of gas. With the exception of periodic calibration to verify the alarm setting, no attention is required after installation. 
Simple, accurate calibration is easy with these economical, all-in-one kits. Choose from 14 different types for sensor and instrument calibration. Kits include zero and span cylinders, regulators, tubing, accessories and instructions. All kits housed in a lightweight carrying case, making it convenient to carry everything directly to the sensor location or job site.
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SMC 3100 Series Flame Detector SMC 3200/3300 Series Flame Detector SMC 2400 Gas Vault Monitor to Detect Combustible & CO
The SMC 3100 Series Flame Detector utilizes a tri-spectra design (UV, IR and visible light spectrums) to provide continuous and reliable flame detection. The 3100 Series design provides the ability to detect flames from both hydrocarbon and non-hydrocarbon sources, making it ideal for a facility where the flame source could be generated from a variety of gases.

The SMC 3200/3300 Series Flame Detectors utilize proven, stable UV/IR technology to continuously monitor for flames in wet bench and commercial applications. Due to its compact size, it is also used for installation in certain production equipment. The detectors can detect gasoline (heptane), polypropylene, isopropyl alcohol, MEK, hydrogen and silane fuel sources.

The SMC 2400 Vault Gas Monitor detects combustible and carbon monoxide gas leaks to reduce the hazard of gas explosion and to maintain personnel safety. The monitor offers the gas detection functions required by telecom site managers including uninterrupted power supply, long-life sensors, five alarm relays, and both audible and visual alarm indication.