Name: LT2 measuring system
Brand: LAMTEC

Flue gas measurement

LAMTEC · LT2

O₂ + COe
LS2/KS1D: ECO · BF · KAF · Ex
SIL1 (KS1D, special configuration)

LT2 is a microprocessor-based measuring system that uses the LAMTEC lambda transmitter with an LS2 lambda probe or a KS1D combination probe, and it is the versatile alternative to LT3. With LS2 it measures oxygen only; with KS1D it measures O₂ in the flue gas of combustion plants and, at the same time, COe, the sum signal of oxidisable components such as CO and H₂. Every LS2 and KS1D probe, including the ECO, BF, KAF and Ex types, can be connected to LT2.

As the system is modular, probe, gas extraction device and options are combined to suit each measuring task. Optionally, LT2 also controls probe purging and automatic calibration. With the GED FLEX gas extraction device, measurement is possible in flue gas at up to 1400 °C depending on the device material; with KAF probes, in gas carrying up to 2000 mg/Nm³ of dust. KS1D probes cover a COe range of 0…1000 ppm, or 0…10 000 ppm on request.

For Ex zones 1 and 2, LT2 is also offered in an EExd housing with ATEX and IECEx marking and works with Ex-type LS2/KS1D probes. As a special configuration, LT2 can be supplied with SIL1 certification to DIN EN 61508 covering safe measurement and limit value output when used with the KS1D probe. The transmitter runs on 230 V or 115 V AC and talks directly to LAMTEC combustion management systems over LSB; PROFIBUS DP and Modbus RTU connections are optional.

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Benefits

LT2 measuring system

O₂ measurement with the LS2 probe; O₂ and COe measurement with the KS1D probe
Works with every LS2 and KS1D probe, including the ECO, BF, KAF and Ex types
Probe purging and automatic calibration control can be added as options
COe reading unaffected by infiltrated air; in-situ measurement in moist flue gas without gas conditioning
EExd housing option with ATEX and IECEx marking for Ex zones 1 and 2
SIL1 to DIN EN 61508 in a special configuration with KS1D
Field-proven design that needs little maintenance
Extensions such as a PID O₂ controller, limit value curves, efficiency calculation and a reference air pump

Modules

LT2 measuring system

LS2 probe

Lambda probe that measures the oxygen in the flue gas directly. With LT2 it can be used as the ECO type (≤ 300 °C, IP42), as the BF type with a GED BASE or GED FLEX gas extraction device, as the KAF type with purging and filter fleece for high dust loads, and as the Ex type for Ex zones 1 and 2. On the KAF type, reference air comes from an instrument air connection on site.

KS1D combination probe

Combination probe with a heated zirconium dioxide (ZrO₂) cell and three electrodes: O₂, COe and reference. It measures O₂ together with COe, the sum of oxidisable components such as CO and H₂; COe accuracy is ±25 % of reading, not better than ±20 ppm. Like LS2, it comes in ECO, BF and KAF types and as an Ex type for Ex zones 1 and 2.

LT2

Key specifications

General data

Specification	LT2
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 (LS2/KS1D ECO, BF, Ex)
Supply voltage	230 V AC / 115 V AC
Interfaces	LSB · PROFIBUS DP, Modbus RTU (optional)
Safety integrity level	SIL1 (KS1D, special configuration)

Probe data

Specification	LS2/KS1D-Ex + GED FLEX	LS2/KS1D ECO + GED ECO	LS2/KS1D-BF + GED BASE	LS2/KS1D-BF + GED FLEX	LS2/KS1D-KAF
Max. flue gas temperature	≤ 1400 °C (material-dependent)	≤ 300 °C	≤ 550 °C	≤ 1400 °C (material-dependent)	≤ 450 °C
Dust concentration	≤ 1000 mg/Nm³ (with purging)	≤ 100 mg/Nm³	≤ 200 mg/Nm³	≤ 1000 mg/Nm³ (with purging)	≤ 2000 mg/Nm³
Degree of protection	IP65	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)
DIN EN 61326-1
DIN EN 61010-1
SIL1 — DIN EN 61508 (special configuration with KS1D)
ATEX / IECEx — II 2G Ex d IIB+H2 T5 Gb, II 2D Ex tb IIIC T100 °C Db (LT2 EExd housing, Ex zones 1 and 2)

Accessories

4 analogue outputs, current (0/4…20 mA) or voltage (0…10 V); 1 or 2 standard, the rest optional; with KS1D, floating design only
7 configurable digital outputs; relay outputs via the 657R0857 relay module, max. 230 V AC / 4 A or max. 48 V DC / 3 A
4 analogue inputs (1 standard, 3 optional): 0/4…20 mA signal, Pt100, 1…5 kΩ potentiometer, pressure sensor or CO/H₂ signal
PC remote display software (657R1101); the RS 232 connection works only with this software
Integrated PID O₂ controller; limit values and limit curves that depend on load and fuel
Flue gas and intake air temperature measurement, combustion efficiency calculation and fuel-specific CO₂ calculation (657R0910)
Reference air pump 657R1060 (230 V AC, 115 V AC, or 230 V AC in a stainless steel housing); LT2 is also offered with the pump in its wall housing
Fully automatic calibration system 657R0940 for BF, Ex and KAF probe types; 24 V DC from the LT2 relay module, IP66, no explosion protection approval
Purge unit: 657R0934 for GED FLEX (min. 6 bar, no Ex approval) or 650R2080 for the KAF pre-filter; LT2 needs the 657R0857 relay module
LT2 EExd housing, Ex zones 1 and 2: window, control buttons, main switch, IP66, -20…+60 °C; requires the LT2 EEx configuration