The 3500/60 & 61 modules provide six channels of
temperature monitoring and accept both Resistance
Temperature Detector (RTD) and Thermocouple (TC)
temperature inputs. The modules condition these inputs and
compare them against user-programmable alarm setpoints.
The 3500/60 and 3500/61 provide identical functionality
except that the 3500/61 provides recorder outputs for each of
its six channels while the 3500/60 does not.
The user programs the modules to perform either RTD or TC
temperature measurements using the 3500 Rack
Configuration Software. Different I/O modules are available in
RTD/TC non-isolated or TC isolated versions. The user can
configure the RTD/TC non-isolated version to accept either TC
or RTD, or a mixture of TC and RTD inputs. The TC isolated
version provides 250 Vdc of channel-to-channel isolation to
protect against external interference.
When used in a Triple Modular Redundant (TMR)
configuration, temperature monitors must be installed
adjacent to each other in groups of three. When used in this
configuration, the system employs two types of voting to
ensure accurate operation and to avoid single-point failures.