Detcon TP-700 SIL 2 Safety Manual - Manual (Page 3)

- Shall be span calibrated every 90 days using a calibrated gas standard and humidifier tubing. After calibration, the
sensor shall be proof tested by applying the calibration gas and checking for the proper response of the 4-20mA
output.
- After the TP-700 has been off power for more than 24 hours, it shall be allowed a 24 hour start-up period before
performing its safety function
- When the TP-700 detects a fault condition it will drive the output to 0mA for at least 5 seconds. Any PLC, DCS,
or other control system used to monitor the TP-700 shall indicate a fault when the output from the sensor drops
below 1.3mA for more than 4 seconds
- Any PLC, DCS, or other control system used to monitor the TP-700 shall indicate that the sensor is in calibration
mode when the output is greater the 1.3mA but less than 3mA. When in calibration mode, the TP-700 cannot
perform its safety function.
- Any PLC, DCS, or other control system used to monitor the TP-700 shall indicate an over-range condition when
the output from the sensor is above 21mA. When the TP-700 is over-range, the actual gas concentration may be
higher than what is being reported by the 4-20mA output.
- The sensor shall not be installed in applications where it will be exposed to known poisons. The poisons include
(but are not limited to):
o Silicone vapors such as those found in greases and lubricants
o Halide compounds containing chlorine, chlorine dioxide, fluorine, HF, HCl, and bromine
o Caustic and acid liquids and concentrated vapors
o Heavy metals such as tetraethyl lead
- At least 10% O
2
in the background gas is required for the TP-700 to operate correctly. The reading is affected by
changing O
2
levels.
- Shall be operated with an input power of 11VDC – 30VDC
- Shall be installed oriented vertically and mounted more than 1ft. above the ground
- If the TP-700 is powered down for long periods of time, it the sensor cell shall be protected with a desiccant
pouch and sealing cap
- Shall not be operated, stored, or transported outside the temperature range of -40ºC to 75ºC
- The TP-700 enclosure and connected cabling shall be properly grounded and shielded
- The Modbus interface shall not be connected when the TP-700 is used in SIL2 applications
- The magnetic switches on the TP-700 shall not be used while the TP-700 is performing its safety function
- The user shall validate the initial configuration and any subsequent configuration changes of the TP-700 before
using it for its safety function. This validation shall be accomplished by performing a proof test after all
configurations are complete.
- No online software tools are needed or are to be used when the TP-700 is performing its safety function.
9 INSTALLATION
NOTE:
For complete information regarding performance, installation, operation, maintenance and specifications of
Model TP-700, refer to instruction manual Document #3150.
No specific or additional detector installation requirements exist above and beyond the standard installation practices
documented in the Model TP-700 Instruction Manual.
Environmental operating specifications are applicable as published in the general specifications section in the Model TP-
700 instruction manual.