Det-Tronics 012731-554 (model LS2000SM18LMSE2S) — FlexSight LS2000 line-of-sight infrared hydrocarbon gas detector, supplied as a stainless steel transmitter and receiver with mounting and alignment hardware.
The LS2000 continuously monitors combustible hydrocarbon gas across an open path and reports concentration in LFL-meters (0–5 LFL-m). This configuration is the long-range version for 30 to 120 meters between modules, factory set for methane, with M25 metric conduit entries and 4-20 mA, HART and RS-485 Modbus outputs on the receiver. The transmitter uses a field-replaceable xenon flashlamp as its IR source.
Specifications
| Model code |
LS2000SM18LMSE2S |
| Material |
Stainless steel |
| Conduit entries |
M25 metric; 4-port receiver, 2-port transmitter |
| Outputs |
4-20 mA (isolated/non-isolated), HART, RS-485 Modbus |
| Detection range |
Long range, 30–120 m |
| Factory set gas |
Methane (changeable in the field via HART or Modbus) |
| Measuring range |
0–5 LFL-meters |
| Approvals code |
S (SIL) and E (ATEX/IECEx); classification 2 (Division and/or Ex d) |
| Operating voltage |
24 VDC nominal, 18–30 VDC, both modules |
| Response time |
T90 2 seconds (5.0 LFL-m applied) |
| Operating temperature |
-55°C to +75°C (-67°F to +167°F) |
| Humidity |
5–99% RH, designed for outdoor use |
Features
- ±0.8° misalignment tolerance (about ±168 cm at 120 m)
- Factory span calibrated for methane, propane and butane; zero calibration in the field by on-board magnetic switch, Modbus or HART
- Microprocessor-controlled heated optics for resistance to moisture and ice
- Mounts to a 4.5 in. nominal OD pole or a flat surface with built-in locking adjusters
- Multi-color status LEDs on both modules
- Certified SIL 2 capable; performance to FM 6325, ISA-12.13.04, EN 60079-29-4 and IEC 60079-29-4
Installation notes
- Alignment is done with the LS2000 alignment tool (012287-002), ordered separately
- An optional three-wire shielded link between transmitter and receiver enables single-point diagnostics and calibration from either module
Related models
- 012731-552: LS2000SN18LMSE2S, same detector with 3/4 in. NPT entries
- 012731-577: LS2000SM25LMSE2S, version with alarm and fault relays (Ex d)
- 012731-504: LS2000SM18SMSE2S, short-range version (5–60 m)
Documents
FAQ
What distance does this model cover?
The 012731-554 is the long-range version, for 30 to 120 meters between transmitter and receiver. Short-range models cover 5 to 60 meters.
Can the target gas be changed?
Yes. The LS2000 is factory calibrated for methane, propane and butane; this unit leaves the factory set for methane, and the selection can be changed in the field via HART or Modbus. Span calibration in the field is not required.
Does it have alarm relays?
No. Output code 18 provides 4-20 mA, RS-485 and HART. Two alarm relays and one fault relay are available only on output code 25 models, which are Ex d approved.
What power does it need?
Both modules run on an external 24 VDC supply, with an operating range of 18 to 30 VDC.
