Teledyne Analytical Instruments | 1220 Multipoint Combustibles

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Industrial Products

Models 1220 & 1223 - Multipoint Combustibles Systems


Model 1220 - Control module system emclosure (8 channel)
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Teledyne’s Model 1220 microprocessor-controlled gas detection system is specifically designed to monitor industrial locations such as refineries and chemical plants, and warn of the presence of potentially explosive gases and vapors.

In addition, the 1220 can activate ventilation or sprinkler systems or shut down process equipment until the danger is eliminated. Developed in collaboration with plant personnel who utilize gas detection equipment, the 1220 is a blend of flexibility and simplicity with state-of-the-art electronics.

Advantages

Dependable microprocessor based electronics
1MAN calibration
No field mounted electronics required
Rugged, field proven detectors

Building Block Concept

Virtually every application has unique requirements beginning with the number of locations to be monitored by one system. Therefore, flexibility is a key ingredient in the 1220’s design. A 1220 system is comprised of a central control station and remote detectors. A system can be as small or as large as needed because the control station incorporates a building block concept of control modules, each of which houses up to eight channel modules connected to one or two detectors mounted in the hazardous location.

A free standing system can accommodate up to seven control modules, 56 channel modules (figure 3) and 112 field mounted detectors. The detectors can be located well over a mile from the main system. Only AC or optional DC power is needed for the system to be fully operational.

Control Module Features

Accepts up to eight channel modules and 16 sensor inputs
Provides common alarm relay outputs from all eight channels
Common audible alarm and bypass switch with indicator light
Main power on/off control and indicator light

Information from all eight channels is fed into a central receiver. The audible alarm and common alarm relays automatically actuate when any alarm condition exists on any channel (failure, caution, or high). Control module relays can be made to operate either normally energized or normally de-energized. A common alarm bypass switch is provided to silence the internal audible alarm, and external alarm devices are not affected by the bypass switch.

Channel Module Features

A 30 second time delay on start up to prevent false alarms
Three customer-selectable calibration modes
Pass code protection
Customer selectable alarm set points and relay functions
Custom backlit LCD display
0-10 VDC output
Error codes to prevent incorrect calibration
Sensor sensitivity gauge
Separate power supplies for each channel
Self diagnostics with fail codes and test points

Model 1223 - 3 channel

The channel module is a stand-alone unit with its own microprocessor, power supplies, alarm relays, self diagnostics and controls. Easy to use and service, each channel module provides self diagnostics that automatically check power supplies, sensors, signal output and connections to insure key components are functioning properly.

Failure codes are provided to quickly locate troubles spots and assist in keeping the system on line at all times. The module can be easily re-configured to operate in the dual detector configuration by simply installing the S2 activation PC board. When installed, the microprocessor automatically reconfigures itself to accommodate the second detector.

Modifications to the channel module settings are protected by an optional pass code which prevents access to the SELECT key menus. Once the SELECT key is activated the menus are displayed. Successive key strokes advance the selection, and menus are prioritized based on anticipated usage.

Options

T Two sensors per channel
M 4-20 mADC output
R RS-485 output (MODBUS Protocol )
V 12-24 VDc operation

Detectors

Refined over the years, Teledyne’s rugged detector design has demonstrated exceptional performance under the harshest environments. Based on the low temperature catalytic oxidation principle, the detector utilizes stainless steel support bars in the construction of the platinum sensing beads which provide exceptional stability and long life under shock and vibration conditions.

During operation, the beads are heated by a constant current through the heating coils. Oxidation of the combustible gases at the catalytic active bead raises the beads. This temperature rise in turn causes the resistance of the coil to increase. Measurement of the change in the coil resistance produces an accurate measurement of the concentration of the combustible gas. The inert bead compensates for changes in coil resistance which might occur from other phenomena other than the combustible gas.

A wide variety of sensor configurations are available to meet specific application requirements including stainless steel sensor housings, lead or silicone resistance, and

Applications

Aerosol filling
Automotive manufacturing
Battery charging
Chemical plants
Loading docks
Metal coating
Sewage plants
Paint and varnish manufacturing
Petroleum refineries
Pipelines
Power plants
Landfills
Semiconductor manufacturing
Solvent manufacturing
Utility companies

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