Model 268 / 268 Ex/268 MR-intrinsically safe explosion-proof differential pressure sensor / transmitter 



 Model 268 series stainless steel diaphragm differential pressure sensor is fixed electrode form a variable capacitor, pressure changes, electrical 
 Capacitance change. Setra's unique capacitance detection circuit will change into a linear DC signal. Flexible diaphragm can be 
 Under 70KPa overvoltage (positive / negative can be) without damage. The sensor / transmitter temperature compensation has been carried out, from the 
 The improved temperature performance and the long-term stability. 
 Or 268MR Model 268 differential pressure transmitter can be used to measure the differential pressure or gauge (static), and signals are converted to proportional 
 The current signal, the output 4-20mA current signal. Excitation voltage of 24VDC. Model 268 (EX) meet the essential safety 
 All requirements, explosion-proof grade ia ll CT4 (selected), explosion-proof environment in the work. Model268/268MR minimum 
 Measuring range is 0 ~ 25Pa, the maximum measurement range of 0 ~ 25KPa, at room temperature accuracy of ± 1% FS, compensated temperature range 
 At +5 ~ +65 ℃, through temperature compensation circuit, the temperature is less than ± 0.06% FS / ℃. 
 Model 268/268MR its excellent performance and low cost, widely used to monitor natural gas pipelines, power plants in areas such as air pressure test 
 Domain. 
 Model268 / 268 MR Performance Specification 
 Performance parameters 
 Accuracy RSS * (constant temperature) 
 Standard 
 ± 1.0% FS 
 Selected 
 ± 0.4% FS 
 Selected 
 ± 0.25% FS 
 Nonlinear (best fit straight line) ± 0.98% FS ± 0.33% FS ± 0.20% FS 
 Hysteresis ± 0.05% FS ± 0.05% FS ± 0.05% FS 
 Non-repeatability ± 0.1% FS ± 0.1% FS ± 0.1% FS 
 Temperature * 
 Compensation range +5 ~ +65 ℃ 
 Zero / Span offset <0.06% FS / ℃ 
 Maximum linear pressure 70KPa 
 Both positive and negative overload 70KPa (10Psi) 
 Preheat drift ± 0.1% FS 
 ** * Location of Installation 
 (Products in the factory calibration will be placed perpendicular to the diaphragm) 
 Range Offset (% FS / G) 
 0-25Pa 2.1 
 0-250Pa 0.22 
 0-1250Pa 0.14 
 0-7500Pa 0.06 
 * RSS: nonlinearity, hysteresis, non-repetitive side and root 
 Environmental and mechanical parameters 
 Operating temperature -18 ~ +65 ℃ 
 Storage temperature -54 ~ +82 ℃ 
 PG-9 cable electrical connector locking device 
 Pressure connection with the 1 / 4 "hose attached to the 3 / 16" compression fitting tower 
 φ8 tower pressure port 
 Adjust zero and full scale output can be adjusted within the shell 
 Pressure medium air