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Murphy Selectronic Micro-Controller-Annunciator Series 1501 User Manual

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Series 1501 Selectronic®



Revised 07-06

Catalog Section 50


The Series 1501 instrument is a microprocessorbased alarm, shutdown and control system with tachometer/hourmeter function. It annunciates in alphanumeric characters the protective device that has signaled an alarm or caused equipment shutdown. Information is called up and adjustments are made on a six-button keypad on the face of the unit. Configurations such as: Alarm or Shutdown Nomenclature, Preset Timers, and Tachometer Calibration can be made in the field.

Murphy’s Series 1501 system has seven SPDT relays. On the standard model, the relays are assigned to the following functions: Lube, Crank, Ignition/Motor, Fuel Valve, Load, Alarm, Shutdown.

The complete Series 1501 system consists of a head (monitor), sensor input terminal strip (two needed for 64 sensor models), 36 inch (914 mm) flat ribbon cable(s) for connecting the terminal block to the head/monitor, and a Class I, Div. 1, explosion-proof power supply.

The Series 1501 system is powered from 120 VAC or 12 or 24 VDC. The head/monitor is rated intrinsically safe and includes a communication port: RS232 or RS485 (Modbus RTU slave). This port allows for remote control functions such as Start/Stop, Load/Unload, etc., and for access to Series 1501 registers.

Alarm/Shutdown for 32 or 64 N.O. or N.C. Sensors

Operating Sequence Selection

Field Adjustable Sensor Nomenclature

Selectable Sensor Lockouts Class A, B, C or P

Built-In Tachometer/Overspeed Function

RS232 or RS485 Modbus RTU Communications

Two Start/Run Timers and Elapsed Time Meter

CSA Certified or NRTL Approved for Use in Class I, Div. 1 Grps. C & D Hazardous Locations



The Series 1501 system can be configured to monitor applications such as: Air and Gas Compressors, Natural Gas Refueling, and other Industrial Operations. For a list of applications and our cataloged programs contact a Murphy sales representative. Custom programming available at additional charge.


32 or 64 sensor inputs (N.O. or N.C.) for alarm or shutdown.

Easy operation/adjustments Six-button keypad.

RS232 or RS485 Modbus RTU communications.

Automatic Engine Control.

Two Start-Run Timers.

Seven Control Relay Outputs.

Pre/Postlube Time Delay.

Automatic Compressor Loading.


Power Consumption: 120 VAC (7.5 VA); 12 VDC (3.5 watts); 24 VDC (3.5 watts).

Sensor Inputs: 32 to 64 N.O. and/or N.C. inputs such as Murphy Swichgage® instruments. Field selectable as a Class A, B1, B2 , C , P or ESD for shutdown, alarm, or control function.

Outputs: 7-SPDT relay outputs, 5 A, 1/16 HP, 125/250 VAC/ 1 A, 30 VDC.

NOTE: For hazardous areas an approved isolation barrier must be used between sensor switch and input terminals if the sensor output comes from any energy storing device such as a relay or transistor.

Adjustable Time Delays:

(standard Series 1501)



Process Delay


Run Delay




Fuel Delay


Load Delay


Class B1 Sensor Lockout

Class B2 Sensor Lockout

Before Ignition Ground or Electric Motor Stop (for up to 59 seconds)

Sensor Inputs Terminal Block: Rail mount DIN type; 32 terminals, screw type.

Opto-Isolated Tach/Run Input: Magnetic pickup, 4.5 to 120 Vrms, 0-10 kHz. CD ignition, positive or negative ground, 100 to 300 VDC, 3-666 Hz. 12 to 125 VDC or 120 Vrms, 50/60 Hz may be used for run signals.

Operating Temperatures: 32 to 122°F (0 to 50°C).

Storage Temperatures: -4 to 158°F (-20 to 70°C). Case: ABS plastic, 1/4 DIN (90 x 90 mm).

Interface Output: Factory configured for RS232; field-selectable for RS485 (specify for factory configured RS485).

Alphanumeric Display: 2 lines, each line with 16 characters (32 characters total).

Power Supply Enclosure: Explosion-proof, Class I, Division 1. Intrinsically safe barrier built into the power supply, 120 VAC with 7 form “C” relay outputs for the following functions (with standard S1501):

Lube Load

Crank Alarm


Shutdown Fuel Valve

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How to Order

To order the Series 1501 system specify the model number for each individual component and accessory:


To Order:


Head with RS232 port for 32 sensors.


Head with RS232 port for 64 sensors.


Head with RS485 port for 32 sensors.


Head with RS485 port for 64 sensors.


Head w/custom* program, RS232 port, 32 sensors.


Head w/custom* program, RS232 port, 64 sensors.


Head w/custom* program, RS485 port, 32 sensors.


Head w/custom* program, RS485 port, 64 sensors.


Communications Cable Assembly, 48 in. (1.2 m) long.


Terminal Block only**


Ribbon Cable Assembly**


120 VAC, 12 or 24 VDC Power Supply.



S1501PCA72 Power and Control Cable Assembly, 72 in. (1.8 m) long. S1501PS-120-E Power Supply with 90° Conduit Elbow fitting. S1501PS-120-LC Power Supply Less Case.

* Specify program number or contact Murphy for available programs listings.

**Two required for 64 sensor models.

Approximate Shipping Weights

Complete Series 1501 System: 28 lb. (12.7 kg).

S1501H-32-2; S1501H-64-2; S1501H-32-4; S1501H-64-4; S1501CH-32-2; S1501CH-64-2; S1501CH-32-4; S1501CH-64-4: 2 lb. (0.907 kg).

S1500TB32: 2 lb. (0.907 kg).

S1500CA36; S1501CC48; S1501PCA72: 2 lb. (0.907 kg). S1501PS-120-LC: 3 lb. (1.36 kg).

S1501PS-120 and S1501PS-120-E: 22 lb. (9.98 kg).

Approximate Shipping Dimensions

Complete Series 1501 System: 20 x 14 x 12-1/2 in. (508 x 356 x 318 mm).

S1501H-32-2; S1501H-64-2; S1501H-32-4; S1501H-64-4; S1501CH-32-2; S1501CH-64-2; S1501CH-32-4; S1501CH-64-4: 6 x 6 x 6 in. (152 x 152 x 152 mm).

S1500TB32: 12 x 7 x 4 in. (305 x 178 x 102 mm).

S1500CA36; S1501CC48; S1501PCA72: 6 x 6 x 6 in. (152 x 152 x 152 mm).

S1501PS-120-LC: 12 x 7 x 4 in. (305 x 178 x 102 mm).

S1501PS-120 and S1501PS-120-E: 17 x 10 x 9-3/4 in. (431 x 254 x 248 mm).


A limited warranty on materials and workmanship is given with this FW Murphy product. A copy of the warranty may be viewed or printed by going to



Module Side View

Back View

4-5/8 in.


3-1/2 in.

(117 mm)

models only

(89 mm)


3-1/2 in.




3-3/4 in.

(89 mm)




(95 mm)



4-3/8 in.



(111 mm)




6-3/4 in. (171 mm)



clearance for plug


Terminal Block




3-1/32 in.



(77 mm)


7 in.



(178 mm)


9 in.



(229 mm)


3-1/16 in.


15 in.

(78 mm)


(381 mm)

Power Supply




for conduit

4-1/2 in.


10-5/8 in.


(270 mm)

(114 mm)





8-5/8 in.



(219 mm)


3/4 NPT


5-15/16 in.


(151 mm)








(2) places



1/2 NPT conduit fitting

918.317.4100 Email:

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time. MURPHY, the Murphy logo, and Selectronic® are registered and/or common law trademarks of Murphy Industries, Inc. This document, including textual matter and illustrations, is copyright protected by Murphy Industries, Inc., with all rights reserved. (c) 2006 Murphy Industries, Inc.

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