background image

Manual Reset 

Automatic Reset 

Figure 4 

Figure 3 

Normally 

Closed 

Ground 

Normally 

Open 

Normally 

Closed 

Ground 

Normally 

Open 

Common 

Common 

 

Single Pole Double Throw 

15A—125, 250 or 480 VAC 

1/4 HP—125 VAC, 1/2 HP– 250 VAC 

1/2A—125 VDC, 1/4A—250 VDC 

 

Single Pole Double Throw 

15A—125, 250 or 480 VAC, 2A—600 VAC 

1/8 HP—125 VAC, 1/4 HP—250 VAC 

1/2A—125VDC, 1/4A—250 VDC 

Notes Regarding Wiring

 

Ensure wire insulation is not damaged  

Connect Wires Firmly to micro switch terminals 

(torque to 4 inch lbs.) 

Wiring must meet or exceed circuitry requirements

 

3.1 

Use 3/16“ hex key to loosen the Enclosure 

Cover/Security feature.  

3.2 

Use a spanner wrench (1/4” pin, 2-4 3/4” 

span) to break loose the

Enclosure 

Cover and

Complete removal by hand. 

3.3 

Connect wires to micro switch as required. 

3.4 

Thread 1/2” MNPT electrical cord Union into 

the Electrical Port located on the side of the 

electrical enclosure housing, 5+ Turns 

3.5 

Thread 

Enclosure Cover 

back onto the 

Electrical Enclosure and

 

ensure it is properly 

seated prior to applying electricity.

 

Wiring 

Electrical 

Enclosure 

Cover 

3/16” cap screw 
locks cover in place 
and fastens car 
seal locking feature  

1/2”FNPT 
Electrical  
Conduit Port 

Figure 2 

ZIMCO INSTRUMENTATION INC.

11141 15 Street NE, Calgary, AB, T3K 0Z5, Canada 

Phone: 

403-253-8320 

Email: 

info@zimco.ca 

Website: 

www.zimco.ca

 

Summary of Contents for RS74A-750F

Page 1: ...A 750F RS74M 750F High Temp Pressure Switch Installation Operation Manual Hazardous Location Pressure Switch 11141 15 Street NE Calgary AB T3K 0Z5 Canada Phone 403 253 8320 Email info zimco ca Website www zimco ca ...

Page 2: ... Knurled Pipe Strap Wrench Area Process Connection Trim Bushing Adjustment Collar 1 Safety 1 1 Power supply must be disconnected before installation calibration and maintenance 1 2 Keep all components dry and free from damage 1 3 Review applicable standards to ensure Robinson Pressure Switch is the correct switch for the application 1 4 Personnel must wear appropriate safety approved apparel for w...

Page 3: ...hex key to loosen the Enclosure Cover Security feature 3 2 Use a spanner wrench 1 4 pin 2 4 3 4 span to break loose the Enclosure Cover and Complete removal by hand 3 3 Connect wires to micro switch as required 3 4 Thread 1 2 MNPT electrical cord Union into the Electrical Port located on the side of the electrical enclosure housing 5 Turns 3 5 Thread Enclosure Cover back onto the Electrical Enclos...

Page 4: ...ning of Pressure Adjusting Collar 4 2 Pressure Setting Turn Collar Clockwise to Increase Pressure Setting Turn Collar Counter Clockwise to Decrease Pressure Setting 4 3 Tighten Cap Screw Tighten Cap Screw to lock Pressure Adjusting Collar in position 5 Notes Regarding Calibration 5 1 Calibration is not required after re setting verifying trip pressure 5 2 Calibration micro switch gap setting is re...

Page 5: ...0F Manual Reset Figure 6 IMPORTANT INFORMATION about Process Temperature Testing Pressure Switches with the minimum Class 1 Div 1 name plate markings do not meet CSA C22 2 No E60079 0 2007 which requires a maximum process temperature to be applied for explosion proof test ing All Robinson Pressure Switches in addition to meeting the minimum Class 1 Div 1 have also been tem perature tested to CSA C...

Page 6: ...service Process Connection Materials are chosen in accordance to NACE MR0175 2003 Piston Orientation Eliminate the need for pulsation dampening Field Service Microswitch replaceable no need to disassemble Pressure Switch Diaphragm Servicing Diaphragm can be replaced without disassembling Pressure Switch Pin socket available for Diaphragm Nut contact Robinson Pressure Controls Low Ownership Costs M...

Page 7: ... train its employees and contractors in the safe use of Robinson products in con nec on with the specific applica on While the informa on and specifica ons contained in this literature are believed to be accurate they are sup plied for informa ve purposes only and should not be considered cer fied or as a guarantee of sa sfactory re sults by reliance thereon Nothing contained herein is to be construe...

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