ABB MEASUREMENT & ANALYTICS | OPERATING INSTRUCTION | OI/AO2000-LS25-EN REV. E

General purpose and explosion-proof variants   Measurement made easy

Introduction

As an integrated part of the Advance Optima series the LS25 can be combined with further analyzer modules and completely operated remotely in Ethernet networks. The LS25 has ATEX, IECEx and CSA certificates for use in potentially explosive atmospheres. 

Safety

General information and instructions

These instructions are an important part of the product and must be retained for future reference. Installation, commissioning, and maintenance of the product may only be performed by trained specialist personnel who have been authorized by the plant operator accordingly. The specialist personnel must have read and understood the manual and must comply with its instructions. For additional information or if specific problems occur that are not discussed in these instructions, contact the manufacturer. The content of these instructions is neither part of nor an amendment to any previous or existing agreement, promise or legal relationship. Modifications and repairs to the product may only be performed if expressly permitted by these instructions. Information and symbols on the product must be observed. These may not be removed and must be fully legible at all times. The operating company must strictly observe the applicable national regulations relating to the installation, function testing, repair and maintenance of electrical products.

Warnings

The warnings in these instructions are structured as follows:

DANGER The signal word ‘DANGER’ indicates an imminent danger. Failure to observe this information will result in death or severe injury.

WARNING The signal word ‘WARNING’ indicates an imminent danger. Failure to observe this information may result in death or severe injury.

CAUTION The signal word ‘CAUTION’ indicates an imminent danger. Failure to observe this information may result in minor or moderate injury.

NOTICE The signal word ‘NOTICE’ indicates possible material damage.

Special operating conditions 

• The gas analyzer meets Ex approval only with a suitably approved purging and monitoring unit for the pressurized enclosure. 

• The maximum permissible purging gas 

pressure (see Purge parameters for pressurized enclosure on page 10) may not be up-scaled. If the purging and monitoring unit used does not have an integrated pressure reducer, the purging gas pressuremust be limited using an additional external pressure reducer. 

• The device contains a 3 V lithium battery. The housing must not be opened when a hazardous atmosphere may be present. The safety instructions in Opening and closing the housing on page 13 must be observed. 

• Possible danger of electrostatic discharge. The safety instructions in Operating instructions on page 21 must be observed.

Ambient conditions

Operating temperature −20 °C to +55 °C Storage temperature −20 °C to +55 °C

Commissioning Introduction 

Having completed the installation of the transmitter and receiver according to the previous sections the analyzer is ready for start-up.  

The start-up of the system consists of 3 main activities: 

1. Start-up of electronics. 

2. Alignment of transmitter. 

3. Alignment of receiver.

Switching on the power supply 

• Switch on the electronics.  

The LCD in the transmitter unit will enter start-up mode 

showing: 

The start-up sequence will make sure the laser is tuned to the correct temperature before it is switched on, and the instrument performs a self-test on all systems. Allow about 5 minutes for the instrument to start the laser. 

The LCD will probably show ‘Laser line-up error’ and ‘Low transmission’ when the laser has started up. This is normal and indicates misalignment of the receiver and transmitter units, i.e. the laser beam does not hit the detector inside the receiver unit. 

If you use a red laser alignment jig for alignment of the transmitter/receiver refer to Align analyzer with laser alignment device on page 52. 

Commissioning 

Align analyzer with laser alignment devicePrinciple of rough pre-alignment During pre-alignment, the purging flanges installed opposite to one another are aligned coaxially to one another using the laser alignment aid. 

Necessary tools and other equipment for the adjustment procedure: 

• 1 × laser alignment device (laser pointer and focusing 

screen) 

• 2 × spanners to adjust the flanges with (M 16) 

• 1 × Allen key (5 mm) for the stud screws。

Mounting the adjustment device 

1. Leave the device switched on and disassemble transmitter and receiver units from the relevant purging flange. 

2. Remove the adapter ring (item 2 in Figure 38) from the purging flange. 

3. Fix the laser pointer to the transmitter-side purging flange with the union nut. 

4. Fasten the focusing screen to the receiver-side purging flange with the union nut. Performing pre-alignment 1. Unscrew the 6 stud screws (item 6 in Figure 38) until the ends of the screws no longer stick out of the holes.   2. Switch on the laser pointer. 3. Align the purging flanges by adjusting the 4 screws (item 5 in Figure 38) until the laser beam hits the center of the focusing screen. 4. Screw in the 4 stud screws until they stop so that the setting is fixed. 5. Switch off the laser pointer. 6. Remove the laser pointer and focusing screen.