Name: LT4 measuring system
Brand: LAMTEC

Flue gas measurement

LAMTEC · LT4

O₂ + COe
KS1D ECO · KS1D-BF · KS1D-Ex

LT4 is a microprocessor-based version of the LAMTEC lambda transmitter for KS1D combination probes. In the flue gas of plants fired with gas or light fuel oil (EL) it measures O₂ in the excess-air range (λ > 1) and detects COe, the sum signal of oxidisable components (CO/H₂). Compared with LT3 and LT2 it has an extra monitoring processor and safe digital and analogue outputs, and it controls the FTU probe function test unit. Only one probe connects to each LT4: KS1D ECO, KS1D-BF or, for Ex zones 1 and 2, KS1D-Ex.

Its safe digital outputs let processes be monitored up to SIL3, and its safe analogue outputs deliver readings up to SIL2. The level depends on fuel and configuration: digital outputs reach SIL3 for oil/gas without FTU, SIL2 for all fuels without FTU and SIL3 for all fuels with FTU; analogue outputs reach SIL2 for oil/gas without FTU, SIL1 for all fuels without FTU and SIL2 for all fuels with FTU (DIN EN 61508, DIN EN 61511). Digital outputs are built into the unit; analogue outputs come from an LSB module. LT4 is designed for high-demand or continuous-mode operation.

With the optional FTU, LT4 operates the valves and pump to feed test gas to the probe, so faults or drift at the sensor are detected within 24 hours at most and the SIL level improves. With the FTU, LT4 is type-approved to DIN EN 16340 and DIN EN 12067-2 and meets the Gas Appliances Regulation (EU) 2016/426. Flue gas temperature is up to 300 °C for KS1D ECO with GED ECO, up to 550 °C for KS1D-BF with GED BASE and up to 1400 °C, depending on material, for KS1D-BF and KS1D-Ex with GED FLEX; on SIL-certified device variants the permissible temperature at the KS1D ECO and KS1D-BF probe head is 300 °C.

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Benefits

LT4 measuring system

O₂ measurement and detection of oxidisable components (COe) with KS1D probes
Safe digital outputs up to SIL3 and safe analogue outputs up to SIL2, depending on fuel and FTU (DIN EN 61508, DIN EN 61511)
Optional function and drift test with FTU: sensor faults or drift detected within 24 hours at most
With FTU, type approval to DIN EN 16340 and DIN EN 12067-2
Monitoring and control as a stand-alone unit with suitably certified burner controls
Easy handling with a plug-in probe connection, low heating consumption and little maintenance
Robust, compact housing

Modules

LT4 measuring system

KS1D combination probe

Combination probe with O₂, COe and reference electrodes in a heated ZrO₂ measuring cell; it measures O₂ together with oxidisable components such as CO/H₂ (COe). With LT4 the options are KS1D ECO with GED ECO (IP42), KS1D-BF with GED BASE or GED FLEX (IP65) and, for Ex zones 1 and 2, KS1D-Ex with GED FLEX (IP65). The KS1D-BF filter design has been tested against flashback in H₂ applications. COe accuracy is ±25 % of reading, not better than ±20 ppm.

FTU function test unit

Optional extension of LT4: LT4 drives its valves and pump to feed test gas to the probe, so sensor faults or drift are detected within 24 hours at most. It improves the SIL level, provides conformity with DIN EN 12067-2 and (EU) 2016/426, and can also act as the probe connection box. Intended for the KS1D-BF probe; powder-coated aluminium housing, IP65, 24 V supply (grounded mains only), typically 30 W, max. 69 W, -10…+60 °C without condensation.

LT4

Key specifications

General data

Specification	LT4
Measuring range	O₂: 0 … 21 % · COe (KS1D): 0 … 1000 ppm (0 … 10 000 ppm on request)
Measuring accuracy (O₂)	±5 % (of reading, not better than ±0.3 vol.%)
Response time (t90)	O₂: < 9 s · COe: < 13 s
SIL — safe digital outputs	SIL3 (oil/gas, without FTU) · SIL2 (all fuels, without FTU) · SIL3 (all fuels, with FTU)
SIL — safe analogue outputs	SIL2 (oil/gas, without FTU) · SIL1 (all fuels, without FTU) · SIL2 (all fuels, with FTU)
Interfaces	LSB · PROFIBUS DP (optional)

Probe data

Specification	KS1D ECO + GED ECO	KS1D-BF + GED BASE	KS1D-BF + GED FLEX	KS1D-Ex + GED FLEX
Max. flue gas temperature	≤ 300 °C	≤ 550 °C	≤ 1400 °C (material-dependent)	≤ 1400 °C (material-dependent)
Dust concentration	≤ 100 mg/Nm³	≤ 200 mg/Nm³	≤ 1000 mg/Nm³ (with purging)	≤ 1000 mg/Nm³ (with purging)
Degree of protection	IP42	IP65	IP65	IP65
Explosion protection (Ex)	—	—	—	Ex zones 1 and 2 · II 2G Ex db (IIB+H2) T4 Gb · II 2D Ex tb IIIC T135 °C Db

Full technical data: data sheet(opens in a new tab)

Approvals and standards

CE declaration of conformity (2014/35/EU, 2014/30/EU, 2011/65/EU)
CE declaration of conformity — (EU) 2016/426 (gas appliances; with FTU only)
EU type examination certificate — DIN EN 16340 (with FTU only)
EU type examination certificate — DIN EN 12067-2 (with FTU only)
DIN EN 13611
DIN EN 60730-1
SIL1–SIL3 — DIN EN 61508 (parts 1–3), DIN EN 61511 (depending on output type, fuel and FTU)

Accessories

Analogue output LSB module: 4 × 0/4…20 mA in the current version or 4 × 0/2…10 V DC in the voltage version; provides the analogue outputs of LT4
Digital LSB module with 4 inputs; two modules linked by a jumper plug give 8 inputs
PROFIBUS DP module: connected via LSB and mounted directly in LT4 or externally, for example in the control cabinet; remote diagnosis via the fault history
Efficiency calculation module: 2 Pt100 inputs (flue gas and ambient temperature), 2 × 0/4…20 mA outputs (flue gas temperature, efficiency); 24 V DC / 50 mA
LSB remote software with USB module: operation from a laptop and backup of configuration and curve data
Additional cover for the UI300-LT4-V2 user interface that achieves IP65; mounting nuts included
SAK probe connection box for LT4-to-probe distances beyond 2 or 5 m without extension cables; not needed when connecting via the FTU