Fairchild t7800 standard range miniature electro-pneumatic transducer installation, operation and maintenance instructions figure 1. Model t7800 standard range transducer identification number system identification number 1 2 non-incendive (division 2) approval on fm voltage input units only. Intrin...
Specifications (continued) performance specifications accuracy (isa s51.1) + + 0.25% full scale guaranteed 0.15% full scale typical hysteresis (isa s51.1) 0.1% full scale deadband 0.02% full scale (isa s51.1) repeatability 0.1% full scale position effect no measurable effect vibration effect less th...
Installation you can mount the model t7800 on a flat surface using two 10-32 screws. For more information, see figure 2. The model t7800 ships from the factory with mounting kit 16799-1 for panel or wall mounting and mounting bracket kit 16893-1 for din rail mounting. For more information, see figur...
Installation (continued) figure 6. Tr7800 outline dimensions figure 5. Td7800 outline dimensions figure 4. Tt7800 outline dimensions 4.
Figure 8. Optional mounting kit 19254-1 (sold separately) figure 7. Din rail mounting kit 16893-1 (included with unit) 5.
Pneumatic connections clean all pipelines to remove dirt and scale before installa tion. Apply a minimum amount of pipe compound to the male threads of the air line only. Do not use teflon tape as a sealant. Start with the third thread back and work away from the end of the fitting to avoid contami...
Calibrations / adjustments equipment required for calibration • pneumatic supply capable of delivering up to 120 psig • current supply capable of delivering up to 30 ma • pressure gauge capable of a digital readout up to 50 psig with an accuracy of 0.1% • digital volt meter capable of a readout up t...
Calibrations / adjustments (continued) figure 10. T7800 calibration configuration 8.
Components figure 11. Exploded drawing 1 2 2 1 1 1 1 1 1 1 1 1 1 3 1 1 1 1 2 table 5. T7800 transducer components description 1 2 3 4 1 5 6 1 7 8 1 9 1 10 11 1 12 1 13 14 15 16 17 1 18 19 qty. Cover, machining screw screw gasket nozzle body assembly orifice assembly spring disk diaphragm spacer ring...
Maintenance troubleshooting table 6. Troubleshooting problem solution (check) no output • supply pressure • clogged orifice leakage • connections low or improper span adjust • zero and span adjust • low supply pressure • output leakage erratic operation • dc signal • loose wires or connections • liq...