A smart way to monitor H₂S in the workplace

Hydrogen Sulfide (H₂S) is a toxic gas that stalks underground telecom vaults and many other enclosed industrial, agricultural, and commercial areas. Highly flammable, H₂S also gravitates to ignition sources, posing a risk of flashbacks or explosions.

The Monnit Enterprise Hydrogen Sulfide Gas Wireless Sensor measures the levels of toxic H₂S gas in the environment. The sensor produces instantaneous and 8-hour time weighted average (TWA) H₂S readings along with temperature. Every five seconds the sensor takes a new temperature-compensated H₂S measurement and checks this measurement against a configurable threshold. If the threshold is crossed, the sensor transmits data immediately. This means the sensor can report a critical gas level as soon as it’s detected. If the threshold isn’t crossed, the sensor transmits H₂S data at a configurable Heartbeat. Using configurable Actions within iMonnit Software, you can set up notifications to be sent via text, email, and phone call as different triggering events occur – gas level, battery level, inactivity, etc. The instantaneous reading is calculated using 40 seconds of data averaged together for improved stability and accuracy. The TWA reading is calculated using eight hours of data.

This sensor come standard with two replaceable AA batteries. The typical battery life is approximately 10 years.

Features

• Measures H₂S levels in surrounding air
• Provides instantaneous and TWA H2S readings
  • Works within excellent range (0 to 50 ppm)
  • Offers configurable thresholds
  • Responds in less than one minute
• Impressive wireless range of up to 1,200 feet through walls
• Frequency-hopping spread spectrum (FHSS)
• Improved interference immunity
• Improved power management for longer battery life
• Encrypt-RF® Security (Diffie-Hellman Key Exchange + AES-128 CBC for sensor data messages)
• Over-the-air updates
• Free iMonnit basic online wireless sensor monitoring and notification system to configure sensors, view data and set alerts via SMS text and email
• Stores 2000 to 4000 readings if gateway connection is lost (non-volatile flash, persists through the power cycle)
  • 10-minute heartbeats = ~ 22 days
  • 2-hour heartbeats = ~ 266 days

Applications

• Natural Gas Production
• Crude Oil Production
• Wastewater treatment
• Utility Facilities
• Sewers

Gateway Options for Seamless IoT Data Communication

Monnit offers a range of gateway options designed to facilitate wireless sensor data communication within IoT networks. These gateways, serve as crucial conduits for transmitting sensor data to the iMonnit software platform and play a pivotal role in ensuring seamless and efficient data transmission for IoT applications.

Click here to explore the diverse range of gateway devices available >>

Manage Your Monnit Sensors with iMonnit Cloud-based Software

Monnit’s Sensor Monitoring Software, iMonnit, stands as a cutting-edge cloud-based platform and central hub tailored for the seamless management of Monnit sensors. With a focus on data security, all information is safeguarded on dedicated servers running Microsoft SQL Server. This intuitive online user interface serves as a command centre for arranging, monitoring, and modifying device settings to suit individual requirements.

OneTemp provides complimentary activation and setup services for new iMonnit accounts, while a free mobile app empowers users to maintain control at all times. Whether opting for the basic version or upgrading to iMonnit Premiere, users can unlock the full spectrum of features that enrich the Monnit experience.

Click here to explore the software options >>

 

Supply Voltage	2.0 – 3.8 VDC (2 x AA 1.5V Batteries or Optional Power Supply) *
Current Consumption	0.7 µA (sleep mode) 2 mA (radio idle/off mode) 2 mA (measurement mode) 25 mA (radio RX mode) 35 mA (radio TX mode)
Operating Temperature Range (Board Circuitry and Batteries)	-18°C to 55°C (0°F to 130°F) using alkaline -40°C to 60°C (-40°F to 140°F) using lithium **
Optimal Battery Temperature Range (AA)	+10°C to +50°C ( 50°F to +122°F )
Operating Pressure Range	± 0.2 atm (recommended)
Operating Humidity Range	15 to 85% RH
Measuring Range	0-50 PPM
Maximum Overload	50 PPM
Measuring Principle	Electrochemical reaction of H2S
Resolution	± 0.1 PPM
Response Time (t-90)	< 40 seconds typical at 20°C
Stabilization Time	< 120 seconds
Long Term Drift – Zero	Zero Signal ≤ ± 2 PPM / month
Long Term Drift – Span	Output Signal ≤ ± 2% of reading per month
Maximum Zero Shift	< 1 ppm equivalent (-20°C to +40°C)
Weight	4.0 oz.
Wireless Range	1,200+ ft. non-line-of-sight
Certifications	900 MHz product; FCC ID: ZTL- RFSC1 and IC: 9794ARFSC1. 920 MHz product; ARIB STD-T108 R210-103733. 868 and 433 MHz product tested and found to comply with: CISPR 22:2008-09 / EN 55022:2010 – Class B and ETSI EN 300 220-2 V2.4.1 (2012-05).

* Circuits cannot withstand negative voltage. Please take care when installing batteries.