Murphy Switch TP 8318N User Manual

TP-8318N  
Revised 05-99  
Section 05  
Installation Instructions for  
(00-02-0164)  
®
Transmission/Gear Pressure SWICHGAGE  
Please read the following information before installing. A visual inspection of this product for damage during shipping is recommended before mounting.  
Diaphragm  
Stainless  
Sensing Element  
Steel Bezel  
WARNING  
Disconnect all electrical power to the machine.  
Make sure the machine cannot operate during installation.  
Follow all safety warnings of the machine manufacturer.  
Read and follow all installation instructions.  
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT  
Polycarbonate  
Lens  
Pulsation  
Dampener  
(Removable)  
Adjustable,  
Self-Cleaning  
Limit Contact  
CAUTION: Certain dangers to human safety and to equipment  
may occur if some equipment is stopped without pre-warning.  
It is recommended that monitored functions be limited to  
alarm-only or to alarm before shutdown.  
Specifications  
Case Material: 20P and 25P Series: Plated steel.  
A20P and A25P Series: Polycarbonate.  
Base Model Description  
Pressure Connection: 1/8-27 NPT.  
®
20P, 25P, A20P and A25P SWICHGAGE  
Contact Rating: Standard is 2A @ 30 VAC/DC resistive (pilot-duty only).  
Models 20PE, A20PE, 25PE and A25PE have non-adjustable snap-switch  
rated 3A @ 30 VDC inductive, 4A @ 125 VAC inductive.  
The gage pointer makes with an adjustable contact to complete a pilot-duty circuit.  
®
20PE, 25PE, A20PE and A25PE SWICHGAGE  
Features internal snap-acting SPDT switches, instead of the single pole/pointer  
contacts. When the switch closes on falling pressure, it becomes Set, as pres-  
sure rises the switch Resets.  
Warranty  
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  
®
20PABS, 25PABS, A20PABS and A25PABS SWICHGAGE  
Same as 20P, 25P, A20P and A25P with internal SPDT snap-switch for pre-alarm.  
through all operating cycles. Failure to isolate gage in this manner will  
void Murphy warranty and possibly cause equipment damage.  
IMPORTANT Installation  
Recommendations  
SWICHGAGE® Used On Transmission/Clutch Oil Pressure  
2. Models with pre-alarm have two switch points and when used with Murphy  
SS300 speed switch–allows changing between high and low switch points  
according to engine RPM. This configuration does away with nuisance  
alarms when shifting or when at idle–yet maintains maximum pressure  
protection. See Murphy Application Tip AT-01 for further details.  
1. Install the SWICHGAGE® using a Murphy pulsation snubber PD2160 in  
the pressure connection at the transmission or gear and at the SWICH-  
GAGE®. The snubber helps reduce pressure spikes/surges which will  
damage the gage sensing element. It also stabilizes the gage readout  
PD2160  
SWICHGAGE®  
Transmission/Gear  
High Pressure Flexible Hose*  
*NOTE: A length of flexible hose between the gear and the SWICHGAGE®  
helps dampen pressure surges.  
CONTROL SYSTEMS & SERVICES DIVISION  
FRANK W. MURPHY, LTD.  
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.  
+44 1722 410055 fax +44 1722 410088  
MACQUARRIE CORPORATION  
P.O. Box 1819; Rosenberg, Texas 77471; USA  
+1 281 633 4500 fax +1 281 633 4588  
1620 Hume Highway  
Campbellfield, Vic 3061; Australia  
+61 3 9358 5555 fax +61 3 9358 5558  
FW Murphy  
P.O. Box 470248  
Tulsa, Oklahoma 74147 USA  
+1 918 317 4100  
fax +1 918 317 4266  
MURPHY DE MEXICO, S.A. DE C.V.  
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje  
San Luis Potosí, S.L.P.; México 78384  
+52 444 8206264 fax +52 444 8206336  
Villahermosa Office +52 993 3162117  
MURPHY SWITCH OF CALIFORNIA  
41343 12th Street West  
Palmdale, California 93551-1442; USA  
+1 661 272 4700 fax +1 661 947 7570  
USA–ISO 9001:2000 FM 28221  
UK–ISO 9001:2000 FM 29422  
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.  
Printed in U.S.A. 113286N  
Installation TP-8318N page 1 of 1  
 

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