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A-B 1746-NT8 SLC500 ​Module Operation

If open circuit detection is enabled, the module tests for an open-circuit

condition. If it detects an open-circuit, over-range, or under-range

condition, the module sets a unique bit in the channel status word

and causes the channel status LED to flash.

The SLC processor reads the converted thermocouple or millivolt data

from the module at the end of the program scan, or when

commanded by the ladder program. After the processor and module

determine that the data transfer was made without error, the data can

be used in your ladder program.

Module Operation

The module’s input circuitry consists of eight differential analog

inputs, multiplexed into an A/D convertor. The A/D convertor reads

the analog input signals and converts them to a digital value. The

input circuitry also continuously samples the CJC sensors and

compensates for temperature changes at the cold junction (terminal block).

A-B 1746-NT8 The module fits into any single slot for I/O modules

Hardware Features

The module fits into any single slot for I/O modules in either an SLC

500 modular system or an SLC 500 fixed system expansion chassis

(1746-A2), except the zero slot which is reserved for the processor. It

is a Class 1 module using 8 input words and 8 output words.(2)

The module contains a removable terminal block providing

connections for eight thermocouple and/or analog input devices. On

the terminal block are two cold-junction compensation (CJC) sensors

that compensate for the cold junction at ambient temperature. It

should also be noted there are no output channels on the module.

Configure the module with software rather than with jumpers or switches.

IMPORTANT

There is a jumper (JP1) on the circuit board. The

module is shipped with the jumper in the up

position as illustrated below. Do not change the

position of JP1. The jumper is used for test purposes

only.

A-B 1746-NT4 SLC™ 500 4-Channel Thermocouple/mV Input Module

System Operation

At power-up, the thermocouple module performs a check of its

internal circuits, memory, and basic functions. During this time the

module status LED remains off. If no faults are found during the

power-up diagnostics, the module status LED is turned on.

After power-up checks are complete, the thermocouple module waits

for valid channel configuration data from your SLC ladder logic

program (channel status LEDs off). After configuration data is written

to one or more channel configuration words and their channel enable

status bits are set, the channel status LEDs go on and the

thermocouple module continuously converts the thermocouple or

millivolt input to a value within the range you selected for the enabled channels.

Each time a channel is read by the module, that data value is tested by

the module for a fault condition, i.e. open circuit, over range, and

under range. If such a condition is detected, a unique bit is set in the

channel status word and the channel status LED blinks.

The SLC processor reads the converted thermocouple or millivolt data

from the module at the end of the program scan, or when

commanded by the ladder program. The processor and thermocouple

module determine that the backplane data transfer was made without

error, and the data is used in your ladder program.

A-B 1746-NT4 The thermocouple module input circuitry consists

Module Operation

The thermocouple module input circuitry consists of four differential

analog inputs multiplexed into a single analog-to-digital (A/D)

convertor. The mux circuitry also continuously samples the CJC A and

CJC B sensors and compensates for temperature changes at the cold

junction (terminal block). The figure on the following page shows a

block diagram for the analog input circuitry.

The A/D convertor reads the selected input signal and converts it to a

digital value. The multiplexer sequentially switches each input

channel to the module’s A/D convertor. Multiplexing provides an

economical means for a single A/D convertor to convert multiple

analog signals. However, it does affect the speed at which an input

signal can change and still be detected by the convertor.

ABB is pleased to introduce the NGC8106

Data that is real-time

ABB is pleased to introduce the NGC8106. Based upon the

industry leading NGC platform, the NGC8106 is a perfect

replacement for composite samplers. The user can now enjoy

real-time data instead of monthly averages, and shipping and

sample collection errors have been virtually eliminated.

Addin a multivariable transmitter and the NGC8106 becomes a

total energy meter. Or utilize the remote communications on

the 8106 to transmit real gas quality data to an existing flow

computer.

Data that is accurate

The NGC8106 is a single stream manual calibration device, it

is intended to be calibrated monthly or quarterly, so there is no

need to leave an expensive calibration blend at each GC site.

Easy to use and cost effective

The use of the NGC8106 eliminates many of the problems

associated with composite samplers. There are no sample

transport issues, no analysis costs, no lag in getting the

gas quality information into the gas accounting system and

instant alarming of potential data loss. While the initial cost of

the NGC and its installation may be higher than a composite

sampler. The sampler’s ongoing operation and maintenance

costs make the NGC8106 a viable economic alternative.

ABB NGC8106 Data is difficult to obtain and not cost effective

Data is difficult to obtain and not cost effective

Shipping requirements and DOT regulations make it

increasingly difficult to ship samples to the central laboratory.

These problems with composite sampler had to be tolerated

because the cost of a GC was too much to put on these lower

volume stations, UNTIL NOW.

Solution: NGC8106

Data that is real-time

ABB is pleased to introduce the NGC8106. Based upon the

industry leading NGC platform, the NGC8106 is a perfect

replacement for composite samplers. The user can now enjoy

real-time data instead of monthly averages, and shipping and

sample collection errors have been virtually eliminated.

Addin a multivariable transmitter and the NGC8106 becomes a

total energy meter. Or utilize the remote communications on

the 8106 to transmit real gas quality data to an existing flow

computer.

ABB NGC8106 Data is not real-time

Data is not real-time

Typically it takes one month to collect sample before it is sent

to the laboratory for analysis. Although the analysis probably

only takes a week, it could still be another three weeks before

the technician is back at the site to collect the next sample

bottle. By the time the gas quality data is entered into the flow

computer it could be anywhere from 1-2 months old.

Data is not accurate

Although the lab analysis is very accurate it is only as good

as the sample handling practices that were used to obtain the

sample. IF the sample bottle is not properly purged or clean

when it was installed then the analysis data will be corrupted.

The error gets magnified when applied across a whole month

of gas production.

Data is difficult to obtain and not cost effective

Shipping requirements and DOT regulations make it

increasingly difficult to ship samples to the central laboratory.

These problems with composite sampler had to be tolerated

because the cost of a GC was too much to put on these lower

volume stations, UNTIL NOW.

Solution: NGC8106

ABB NGC8106 Innovations include

The NGC8106 performs on-site, real-time gas analysis and

heating value computation. The 8106 can be used as a total

energy meter with the addition of a multivariable transmitter!

The NGC8106 is a perfect replacement for automatic

samples. The user will enjoy real-time data instead of monthly

averages, and shipping and handling errors have been virtually

eliminated. The NGC8106 is based upon the industry leading

NGC8206 platform.

Innovations include

– Compact design

– Extreme serviceability

– Low installation costs

– Low utility requirements

– Low maintenance

– Unmatched performance

Simple, reliable, easy to service, low cost measurement.

ABB The equipment used for this analysis consists of the standard NGC8209

Equipment

The equipment used for this analysis consists of the standard

NGC8209 mounted in a black case. It is recommended that

the unit be left in an operational mode while transporting.

All the valves, gauges, inlet ports, and PCCU32 (the laptop

driven man-machine interface) connectors are bulkhead

mounted on panel to provide the technician with ready access.

Stream averages for the (default¹) 840 last hours, 35 last

days and the most recent last month analyses. Operational

Parameters for the (default¹) last 480 cycles (Diagnostics Report):

– Selected peak times

– Selected peak areas

– Ideal Btu/CV

– Carrier regulator pressure

– Oven temperature

– Ambient temperature

– Sample pressure

– Detector noise values

– Detector balance values

Audit logs (Default¹)

– Last 480 alarms

– Last 480 events

ABB NGC8209 Natural gas chromatograph Historical data

Historical data

The NGC8209 is designed to retain historical data. This data

can be used for custody transfer needs, verify transmitter

operation over time, and provide a limited data backup for

communication link reliability. In addition, various CSV file

outputs are available to download the analysis data into

spreadsheet based company specific data sheets, and

outputs to 3rd party gas accounting packages.

The default¹ memory configuration provides the most recent

480 analysis cycles containing:

– Normalized components

– Un-normalized components

– Ideal Btu/CV

– Real Btu (wet and dry) / CV (superior and inferior)

– Relative density (specific gravity)

– Density

– GPM

– Wobbe index

– Alarms

Stream averages for the (default¹) 840 last hours, 35 last

days and the most recent last month analyses. Operational

Parameters for the (default¹) last 480 cycles (Diagnostics Report):

– Selected peak times

– Selected peak areas

– Ideal Btu/CV

– Carrier regulator pressure

– Oven temperature

– Ambient temperature

– Sample pressure

– Detector noise values

– Detector balance values

Audit logs (Default¹)

– Last 480 alarms

– Last 480 events

Data retained by the NGC8209 can be collected via a remote

communication link or by the laptop PC local operator interface PCCU 32.

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