Q: "I have anosmia, i.e. I have lost my sense of smell. We have natural gas heat, a natural gas water heater and a natural gas cooking stove. I cannot smell a gas leak. Which gas detector do you recommend?"
Answer: Currently, we sell two brands of combustible gas alarms and an automatic gas shut off system that shuts off gas and sounds a loud alarm when a significant gas leak occurs.
Two brands are UL1484 listed for use with natural gas and propane gas and also work with gasoline fumes and butane fumes. These are the Safe-T-Alert 40-411AC and the Safety Siren Combustible Gas Alarm and the Safety Siren CO and Combustible Gas Alarm.
The advantage of the Safe-T-Alert is the long cord for proper positioning of the detector, i.e. high and near the appliance for natural gas and low and near the appliance for propane. We also sell the Safe-T-Alert Combustible Gas Alarm in a 230VAC unit for Europe and Asia. The Safety Siren unit is a direct plug in with a safety tab that the outlet cover center screw (standard 2 or 3 prong outlet) goes through so the unit cannot be easily removed. Most customers who buy the Safety Siren model install an electrical outlet at the proper height for natural gas or propane.
All our combustible gas alarms sound at less than 25% of the lower explosive or flammable level of the gas.
The Scentry III GFRAB propane/natural gas detector is only one component of this home safety system. The GFRAB means Gas, Feet on the bottom of the case, Remote, Alarm and Battery. To have a complete system, you need these additional components:
As noted above, the compatible valves are in .5, .75 and 1 inch sizes. Each valve is an electrically operated gas shut off valve that opens and closes on a demand signal from a thermostat or other controlling device. Can be used with both natural gas and LP gas at pressures up to 0.5 psi. The White Rodgers replacement is a compression spring closing and soft seat construction gas valve.
The advantage of this system is that the controller unit supports up to 5 calibrated remote sensors.
Scentry III-GFRAB Specifications:
- Case: ABS Plastic
- Physical Size: 7.6 inches by 4.6 inches
- Weight: 2.25 lbs
- Color: Gray
- Power consumption: 1.5va
- Supports up to 5 calibrated remote sensors (not included)
- Requires Scentry III-GVD gas valve (purchase separately)
- Supports Battery Back-Up (Not Included)
- Supports Gas Valve Controller for Explosive Gas (Not Included)
- Connections: screw terminals
- Input Power: 115VAC, 60 Hz
- Output Control Relays: 2 amps,
- 24 VAC Alarm Signal
- Output: 12V DC @500 ma
- Reset: manual
- Sensor Type: Tin Dioxide Semiconductor
- Alarm Points: Propane (LP) <5200 PPM Alarm Points: Natural Gas / Methane <12,200 PPM
- Manufactured Proudly in the USA for Safety First USA, Inc.
- Warranty: 1 year from date of purchase.
Thanks for your question. Just remember propane gas and natural gas are safe sources of energy if you add protective measures including alarms, shut off valves and regular maintenance of the appliances that use gas.