6
Section 1 Model 288A Differential Pressure Indicating Switch
Switch Contact Rating:
5.0 Amps @ 250 VAC, 50/60 Hz
1
3.0 Amps @ 30 VDC (Resistive)
1,2
1.0 Amp @ 30 VDC (Inductive)
1,2,3
1. CSA Approved
2. CE Approved (Voltage limited to less than 50 VDC or 35 VAC for CE applications)
3. Arc suppression recommended for inductive loadings.
Relay Contact Ratings:
10 Amps @ 150/250 VAC
10 Amps @ 14/28 VDC
1.0 HP @ 208/240 VAC
Relay Coil Voltages:
120 VAC @ 5VA Max.
110 VDC @ 2W Max.
Coil Power Requirement:
DC Relay ........................................ 1.5 Watts
AC Relay ........................................ 2.75 Volt Amps
Accuracy of Indications (1 or 2 SPDT Switches):
0 to 30" WC to 0 to 50" WC...............................±1-1/4% of full scale DP
0 to 51" WC to 0 to 60 PSI ................................±1% of full scale DP
0 to 61 PSI to 0 to 150 PSI ...............................±1-1/4% of full scale DP
0 to 151 PSI to 0 to 400 PSI .............................±1-1/2% of full scale DP
0 to 401 PSI to 0 to 600 PSI .............................±2% of full scale DP
0 to 601 PSI to 0 to 1000 PSI ...........................±4-1/2% of full scale DP
1 or 2 DPDT Switches (S401) .......................... Add ±1/2% to above values
Near switch setpoint (±10% full scale) ............. Add ±1/2% to above values
For suppressed ranges .................................... Add ±1/4% to above values
Switch Deadband:
SPDT .............................................. ±5% of full scale DP (max)
DPDT .............................................. ±6% of full scale DP (max)
Accuracy of Repeatability ............... ±0.25% of full scale DP
Nuclear Qualifi cations
The following nuclear qualifi cation applications are based on Cameron Engineering
Report 9A-CR3-288A-13 and 50277306-C-0000193 with switch chatter sensitivity ad-
dressed in Cameron Engineering Report 9A-CR3-288A-19:
• One or two SPDT switches: Radiation Augmented (3 MRads), Full Functional, 12G,
Mild Environment Applications
• One or two DPDT switches: Structural and Pressure Boundary Integrity Applica-
tions
• One or two relays: Structural and Pressure Boundary Integrity Applications
• Three or four independently adjustable SPDT switches: Structural and Pressure
Boundary Integrity Applications
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