FLD-SMC is a high-performance all in one monitoring controller built into one budget conscious package. It is designed for detecting leaks of refined petroleum products and solvents in extreme environmental conditions when installed with approved sensors FLD-HSC-TL and FLD-O2W-SP. The device is a wall-mounted standalone leak detection controller. The maximum sensor length is limited to 150 ft/45 m per FLD-SMC distributed in three separate zones. These leak detection controllers (FLD-SMC) offer industry-standard output communications:
- Modbus RTU
- Modbus TCP
- Dry contacts (2 SPDT Relays)
For classified locations applications, the sensor cables and the sensor probe will be wired to the controller through a Zener barrier, with FLD-SMC module installed in an area approved enclosure.
Features
FLD-SMC Leak Detection Controller Features
- Detects leaks of combustible liquids in a very wide temperature ranges in under 30 seconds!
- 10-Year Factory Warranty on Controls & sensors
- Provides indication of the leak magnitude (LCD and Modbus versions only)
- Able to detect the vapors from refined fuels
- The only FM7745 approved leak detection controller with adjustable alarm threshold allowing you the most rapid alarm to leaks
Specifications
FLD-SMC Leak Detection Controller Specifications
| Dimensions | 5.3 x 3 x 2 in (135 x 75 x 50 mm) |
| Weight | 0.5 lb. (225 g) |
| Fire Rating | UL94-HB |
| Ingress Rating | Panel: IP40/NEMA 1 indoor use only |
| Operating Temperature Range | 14°F to 140°F (-10°C to +60°C) |
| Power Supply Voltage Range | 100-240 VAC or 12-24 VDC |
| Maximum Length of Cable | Sensor Cable: 50 ft. (15 m) up to three individual sensors per control. Leader/Jumper Cable (AWG22 min): 30 ft. (90 m) |
| Power Consumption | 1.5VA / 1.2 W max. |
| Mounting | Wall-mounted |
Typical Detection Times at 68°F (20°C) with Approved Sensors
| Unleaded Gasoline | 20-22 seconds |
| Diesel | 25-28 seconds |
| Jet Fuel | 25-28 seconds |
Performance tested and validated by FM Approvals.
FLD-SMC Leak Detection Controller Product Codes
| FLD-SMC-LCD-VAC | Leak detection controller for hydrocarbon and solvent leaks, up to three sensors, with LCD and 2 SPDT relays. Power Input: 100 240 VAC |
| FLD-SMC-LCD-VAC-485 | Leak detection controller for hydrocarbon and solvent leaks, up to three sensors, with LCD, Modbus RTU and 2 SPDT relays. Power Input: 100 240 VAC |
| FLD-SMC-LCD-VAC-TCP | Leak detection controller for hydrocarbon and solvent leaks, up to three sensors, with LCD, Modbus TCP and 2 SPDT relays. Power Input: 100 240 VAC |
| FLD-SMC-LCD-DC | Leak detection controller for hydrocarbon and solvent leaks, up to three sensors, with LCD and 2 SPDT relays. Power Input: 12-24 VDC |
| FLD-SMC-LCD-DC-485 | Leak detection controller for hydrocarbon and solvent leaks, up to three sensors, with LCD, Modbus RTU and 2 SPDT relays. Power Input: 12-24 VDC |
| FLD-SMC-LCD-DC-TCP | Leak detection controller for hydrocarbon and solvent leaks, up to three sensors, with LCD, Modbus TCP and 2 SPDT relays. Power Input: 12-24 VDC |
| FLD-SMC-VAC | Leak detection controller for hydrocarbon and solvent leaks without display, single sensor, 2 SPDT relays. Power Input: 100 240 VAC |
| FLD-SMC-VAC-485 | Leak detection controller for hydrocarbon and solvent leaks without display, up to three sensors, Modbus RTU and 2 SPDT relays. Power Input: 100 240 VAC. |
| FLD-SMC-VAC-TCP | Leak detection controller for hydrocarbon and solvent leaks without display, up to three sensors, Modbus TCP and 2 SPDT relays. Power Input: 100 240 VAC |
| FLD-SMC-DC | Leak detection controller for hydrocarbon and solvent leaks without display, single sensor, 2 SPDT relays. Power Input: 12-24 VDC |
| FLD-SMC-DC-485 | Leak detection controller for hydrocarbon and solvent leaks without display, up to three sensors, Modbus RTU and 2 SPDT relays. Power Input: 12-24 VDC |
| FLD-SMC-DC-TCP | Leak detection controller for hydrocarbon and solvent leaks without display, up to three sensors, Modbus TCP and 2 SPDT relays. Power Input: 12-24 VDC |
Applications
FLD-SMC Leak Detection Controller Applications
- Leak detection around generators, Subbase tanks, day tanks, and supply and return plumbing in Data Centers, Industrial Facilities, Hospitals, and Commercial buildings
- Detection of leaking fuel oil from boiler installations, Fuel oil storage, and supply and return plumbing
- Fuel / Oil on water Leak detection in outdoor containment areas and sumps
Q & A
FLD-SMC High-Performance Leak Detection Controller Q & A
The FLD-SMC works with approved Naftosense sensors FLD-HSC-TL (hydrocarbon sensor cable) and FLD-O2W-SP (oil-on-water sensing probe). It supports up to three separate sensor zones. Total maximum sensor cable length is 150 ft (≈ 45 m) per controller when distributed across the three separate zones. Each individual sensor cable (per channel) is limited to about 50 ft (15 m) between the sensor and the controller. There is also provision of a leader/jumper cable (minimum AWG22) up to ~30 ft (≈ 90 m).
Outputs/options available include dry contacts (2 SPDT relays) for simple alarm/fault switching. For digital communication, it supports Modbus RTU and Modbus TCP variants in some model options. Some versions include an LCD display that shows leak magnitude; this helps with diagnostics and knowing how severe a leak is. It also has an adjustable alarm threshold, allowing earlier or delayed alarm triggering depending on how sensitive you want it.
Detection times (with approved sensors) at ~20 °C / 68 °F are:
- Unleaded Gasoline ~20-22 seconds
- Diesel ~25-28 seconds
- Jet Fuel ~25-28 seconds
The operating temperature range of the controller is 14 °F to 140 °F (−10 °C to +60 °C). Note: It is meant for indoor use, panel-mounting; the ingress rating is modest (panel-IP40 / NEMA 1) without a special enclosure. Environmental extremes (humidity, dust, etc.) may require protective housing.
- Power supply options: model variants support 100-240 VAC, or 12-24 VDC input.
- The controller is wall-mounted. Size is about 5.3″ × 3″ × 2″ (135 × 75 × 50 mm), weight ~0.5 lb (≈ 225 g).
- The leader/jumper cable (between sensors or probe and the controller) must be AWG22 minimum, and there's a limit on its maximum length (~30 ft / 90 m) for reliable operation.
- Since ingress rating is IP40 / NEMA 1 for indoor panel mount only, outdoor or hazardous locations may require additional enclosures or barriers, such as a Zener barrier.
The FLD-SMC is FM7745 approved for leak detection applications. This is important for meeting insurance / regulatory requirements, especially in settings with refined petroleum/solvent handling. The controller must be installed according to the manufacturer’s instructions, and for classified locations (hazardous areas), the sensor cables/probe need to be wired via an approved Zener barrier, and possibly the controller placed in an approved enclosure to maintain certification.
Downloads
Download Naftosense FLD-SMC High-Performance Leak Detection Controller Datasheet
Also be sure to check out the following:
FLD-O2W-SP Sensing Probe for Oil-On-Water Leak Detection
FLD-HSC-TL High-Reliability Hydrocarbon Sensor
Talk to one of our technical specialists today at (855) 737-4718, or fill out our online form to learn more.