These dependable transmitters accurately measure temperature between -220 and +760°C (-350 and +1400°F) and transmit a standard pneumatic signal to receivers which may be up to several hundred metres or yards away.The 12A Series transmitters are used with pneumatic receivers to indicate, record, or control the temperature of processes. By means of the standard Foxboro force-balance mechanism, these transmitters produce a 20 to 100 kPa, 3 to 15 psi, or 0.2 to 1.0 bar or kg/cm2 output signal proportional to the temperature at the sensor.
SIMPLE FORCE-BALANCE MECHANISM
The Foxboro force-balance mechanism has no moving parts, links, secondary levers, or pivots. This mechanism has proven itself trouble-free and ensures stable, dependable operation.
SIMPLE RANGE CHANGING
A single screwdriver adjustment allows the instrument zero to be elevated or suppressed 100% of span. Additional elevation or suppression may require a change in the ambient compensating bellows. To change the span, 1 or more of 3 readily installed parts (the thermal system, range spring, and compensating bellows) are involved.
The accuracy of these transmitters, even for narrow span suppressed-zero ranges, is a function of span and is independent of the upper range value.