LT1 measuring system
Modular system with the LS1 probe for O₂ measurement in flue gas; automatic calibration with ambient air and SIL1
LAMTEC · LT1
- O₂ 0 … 21 %
- SIL1
- LS1 HT: ≤ 1400 °C
- Calibration with ambient air
LT1 is a microprocessor-based O₂ measuring system in which the LAMTEC LT1 lambda transmitter works together with the LS1 lambda probe. It measures the oxygen concentration directly in the excess-air range (λ > 1): in combustion plant and industrial flue gases, in furnace atmospheres and in process gases. About 0.5 litres of gas per hour are drawn off through a capillary tube for the measurement, and each LT1 takes only one LS1.
LS1 works on the current probe principle: its signal is a direct current that changes linearly with the oxygen content, and its physical zero point is fixed. No special test gas or reference gas is needed; the probe is checked and calibrated automatically with ambient air (20.96 % O₂), and ageing of the ZrO₂ measuring cell is compensated without intervention. After calibration, accuracy is ±0.1 vol.%. The LS1 type for high-temperature applications measures in flue gas at up to 1400 °C with a ceramic gas sampling part.
Combined with a suitable probe installation fitting and gas extraction device (GED), LT1 can itself control probe purging in high-dust applications as well as automatic calibration. Over the LAMTEC SYSTEM BUS it connects directly to the VMS, FMS, CMS, BT300 and ETAMATIC combustion management systems and supplies the measured value for O₂ optimisation. LT1 is offered on a mounting plate, in a panel installation housing or in a wall-mounting housing, each with its own data sheet.
LT1 measuring system
- Highly accurate oxygen measurement in flue gas across 0–21 %
- Linear DC probe signal (mA) with a fixed physical zero point
- No test gas needed: automatic calibration with ambient air and automatic ageing compensation of the ZrO₂ cell
- No gas conditioning or reference gas needed; the measuring gas temperature does not affect accuracy
- Measurement at up to 1400 °C via a ceramic gas sampling part, using the LS1 type for high-temperature applications
- Does not act as an ignition source in the flue gas duct, as confirmed by TÜV
- Intermittent measuring gas pump that sets its own optimum running time
- SIL1 to DIN EN 61508
LT1 measuring system
LS1 lambda probe
Lambda probe based on the current probe principle: on the hot sensor, oxygen is ionised and pumped, producing a current in proportion to the oxygen content (0–21 % O₂ ≈ 0–500 mA). It connects to LT1 through a 7-core cable with plug and a Teflon hose. IP42 types are available for standard, high-temperature and high-dust applications. If the probe is more than 10 m from LT1, a probe connection box (PCB) near the probe is recommended for the measuring gas pump.
Key specifications
| Specification | LT1 |
|---|---|
| Measuring range | O₂: 0 … 21 % |
| Measuring accuracy (O₂) | ±0.1 vol.% (after calibration) |
| Response time (t90) | < 15 s (with 450 mm GED gas extraction device) |
| Max. flue gas temperature | ≤ 600 °C (standard applications) · ≤ 1400 °C (high-temperature applications) · ≤ 200 °C (high-dust applications) |
| Dust concentration | ≤ 1000 mg/Nm³ (standard applications, high-temperature applications) · ≤ 2000 mg/Nm³ (high-dust applications) |
| Fuels | Natural gas, light fuel oil, heavy fuel oil, coal, biomass, special fuels (probe-dependent) |
| Installation | Mounting plate · panel installation housing · wall-mounting housing |
| Degree of protection | IP65 (wall-mounting housing) · IP42 (LS1) |
| Interfaces | LSB · PROFIBUS DP, Modbus RTU, Ethernet (optional) |
| Safety integrity level | SIL1 |
Approvals and standards
- CE declaration of conformity (2014/35/EU, 2014/30/EU, 2011/65/EU)
- DIN EN 61326-1
- DIN EN 61010-1
- SIL1 — DIN EN 61508
Accessories
- Up to 4 configurable analogue outputs, 0/4…20 mA or 0…10 V; outputs 1 and 2 can be floating (max. 20 V potential difference)
- Up to 7 digital outputs; 6-relay module for operating, status and limit value messages (230 V AC, 4 A switching)
- Up to 4 analogue inputs (0/4…20 mA) on measuring cards, two of them floating; for temperature and pressure sensors or standard signals
- Remote display software for a Windows PC; the RS 232 interface for remote operation from a PC works only with this software
- PID O₂ controller; limit values and limit curves that depend on load and fuel
- Flue gas and intake air temperature measurement for calculating combustion efficiency
- Auto-calibration unit: with a suitable probe installation fitting and GED, calibrates the installed LS1 with ambient air (integrated pump or compressed air)
- Purge unit; in high-dust applications LT1 controls probe purging together with a suitable probe installation fitting and GED
Documents
- Data sheet · LT1 in Wall Mounting Housing (opens in a new tab)
- Data sheet · LT1 on Mounting Plate (opens in a new tab)
- Data sheet · LT1 in Panel Installation Housing (opens in a new tab)
- Data sheet · LS1 (opens in a new tab)
- Operating manual (opens in a new tab)
- Product catalogue (opens in a new tab)
More products in this group
LT2 measuring system
Versatile, modular system for O₂ and CO/H₂ measurement in flue gas with LS2 and KS1D probes
- O₂ + COe
- LS2/KS1D: ECO · BF · KAF · Ex
- SIL1 (KS1D, special configuration)
LT3 measuring system
Compact, robust measurement of O₂ and CO/H₂ in flue gas
- O₂ + COe
- SIL1 / SIL2
LT3-Ex explosion-protected measuring system
O₂ and COe measurement in flue gas for Ex zones 1 and 2 with LS2-Ex and KS1D-Ex probes
- O₂ + COe
- Ex zones 1 and 2
- SIL1 · SIL2 (2 × LT3-Ex)
LT3-F measuring system
O₂ and COe measurement with KS1D probes for CO/H₂ trim control with LAMTEC burner controls
- O₂ + COe
- KS1D ECO · KS1D-BF
Let's choose the right product for your project together
Tell us about your plant and what you need, and our engineers will recommend the right solution.