Gems PS61P Series Training manual

Bulletin No. 239804
Rev. B
PS61P Series
Instruction bulletin
General Descri tion:
The PS61P delivers better ressure ca ability over the PS61 in the same com act 24 mm (15/16") size. It is designed for medium to high ressure
hydraulic a lications. The modular design allows the user to customize the ressure interface with a wide variety of US, British and ISO stud ends.
In addition, numerous elastomers are available to ensure com atibility with the end user's fluid and ex ected o erating tem erature range. The
PS61P is available with seven different electrical termination o tions including integral connectors, flying leads, cable and connector harnesses. All
of this flexibility in a com act ackage, lus the availability of adjustable models, makes the PS61P the ideal roduct solution for demanding hydraulic
a lications.
Princi le of O eration:
The PS61P is designed to be used with non-aqueous low viscosity liquids. The liquid under ressure enters a small ort in the mounting fitting. This
ressure a lies a force to a radially sealed rod that is guided by a ro rietary lastic bearing. The rod movement is transmitted to a tightly controlled
travel control mechanism that moves the electrical contacts. For normally o en versions (A circuit), the contacts close on increasing ressure which
com lete a low resistance ath between either the terminal blades (-SP or -TS), two wires (-FLA, -FLF, -FLSA, -FLSF or -CAB) or two connector ins
(-SS, -WM,-WF, -DE or -DT). When the ressure decreases, the contacts will reo en creating an o en circuit between the electrical interfaces
described above. The normally closed (B circuit) exhibit a low resistance ath between the electrical terminations at 0 si and conversely create an
o en circuit u on the ex osure to increasing ressure. The oint at which the ressure switch o erates can be either factory set or adjustable. Only
the -SP, TS, -FLA and -FLSA versions are adjustable. See the adjustment section for the rocedure. The other versions are adjusted to the
customer's desired set oint at the factory and cannot be changed by the user.
S ecifications:
Wetted Materials
Housing Material RoHS com liant zinc lated steel
Housing O-ring Material NBR (std); EPDM or Viton® o tional
Piston Rod Material Hardened alloy steel
Piston Rod Seal NBR (std); EPDM or Viton® o tional
Piston Rod Backu Pro rietary filled PTFE
Bearing Pro rietary lastic resistant to almost all chemicals
Pressures
Proof 7000 si (483 BAR)
Burst 22000 si (1517 BAR)
Tem eratures
Fluid -10° to 250° F (-40° to 121° C) de ending on set oint, fluid viscosity and
elastomer chosen
Ambient -40° to 225° F (-40° to 107° C) de ending on set oint, fluid viscosity and
elastomer chosen (-CAB limited to 75°C)
Storage -65° to 275° F (-54° to 135° C) (-CAB limited to 100°C)
Electrical Rating
100 VA for silver contacts. Gold contacts recommended for logic level loads
(<12 VDC and< 20 mA). AC loads can be switched but must be within 100
VA. Avoid inductive loads to revent contact erosion which will alter the set
oints.
Contact resistance 4-15 milliohms ty ical
Ingress Protection
-SP and -TS IP00
IP67 er IEC 60529 ( ending)
IPX9K er DIN 40050-9 ( ending)
IP6KX er DIN 40050-9 ( ending)
A rovals CE, RoHS
-SS, -DT, -FLA,-FLF, -FLSA,
-FLSF and -CAB

Installation and Mounting :
Electrical Termination: Descri tion Recommended mating termination
-SP 1/4"x.032" Male S ades Insulated 1/4" female quick connects crim ed to wire of a ro riate tem erature and am acity
-TS 6-32 Terminal Screws 18-24 AWG wire of a ro riate tem erature and am acity
-SS Integral AMP Su erseal 1.5 Am 282080-1 connector with wire/cable a ro riate sockets
-DT Integral Deutsch DT04-2P DT06-2S mating connector with wire/cable a ro riate sockets
-DE Deutsch DT04-2P harness DT06-2S mating connector with wire/cable a ro riate sockets
-WM Weather ack 12010973 hsg with two
12089040 ins wire harness Weather ack 12015792 hsg with wire/cable a ro riate sockets
-WF Weather ack 12015792 hsg with two
12089188 sockets wire harness Weather ack 12010973 hsg with wire/cable a ro riate ins
-CAB 18 AWG, 75°C PVC jacketed cable A lication de endent
-FL (all styles) SAE J1128 105°C wire A lication de endent
1. For all straight thread units, an O-ring or washer seal of the a ro riate material, durometer and size is required to seal the ressure switch to the
customer's ort. The chart below details the O-ring Gems su lies as standard with a unit. The O-ring material will be of the same elastomer family as
the seal material chosen during roduct s ecification. It is the customer's res onsibility to ascertain the suitability of the O-ring com ound, durometer
and tem erature range with their a lication.
2. Tighten the sensor to the a licable rotation outlined in note 3 (ta ered threads) or torque given in the table below (straight threads) using a 15/16 or
24 mm crows foot or o en end wrench. Do not a ly torque of any kind to any of the lastic com onents. Over-torqueing of the ressure switch could
ermanently damage or weaken the sensor.
3. 1/8 or 1/4 NPT sensors: After a lying heavy duty Teflon ta e or high ressure thread aste to the male threads, tighten the ressure switch 1.5 to 2.5
turns ast finger tight engagement. Over-torqueing of the ressure switch could ermanently damage or weaken the sensor.
4 . Electrical termination. The PS61P is available with a wide variety of electrical terminations. Connecting these o tions ro erly will ensure the IP ratings
are met and the electrical erformance is maintained. See the chart below for recommended ractices. Remember to follow safe wiring ractices and
abide by all electrical codes.
5. The PS61P will function in any orientation. However, it is recommended to mount the switch to maximize gravitational drainage around the electrical
interfaces. The use of rotective shields to guard against article im act and ressure washing is also recommended. Pro er ingress rotection is only
maintained when harnesses and connectors of suitable IP ratings are utilized and ro erly installed. Ingress rotection ratings may become IP00
without ro er electrical terminations.
Thread Sizes O-ring or Washer Torque
1/8 NPT N/A See Note 3
1/4 NPT N/A See Note 3
7/16-20 SAE J1926-2 3-904, 90 duro 20-22 N-m (14.8-16.2 lbf-ft)
9/16-18 SAE J1926-2 3-906, 90 duro 45-49.5 N-m (33.2/36.5 lbf-ft)
1/4-19 G style er ISO228-1 N/A (Dowty® recommended) 40-44 N-m (29.5-32.5 lbf-ft)
M10x1.0 er ISO 6149-2 8.1MMx1.6MM, 90 duro 20-22 N-m (14.8-16.2 lbf-ft)
M14x1.5 er ISO 6149-2 11.3MMx2.2MM, 90 duro 45-49.5 N-m (33.2/36.5 lbf-ft)
Wiring Diagram: (0 PSIG)

Thread Details :
Unit Ty es :

Adjustment :
Warning: Only the -SP, -TS, -FLA and -FLSA models are adjustable.
Warning: All adjustments shall be erformed while a lying a controlled and monitored hydraulic ressure using fittings and hardware of a ro riate
ressure ca ability. The electrical contacts shall also be monitored by a digital multimeter or by using LED indicator lights of suitable electrical rating
to avoid damaging the contacts.
Danger: The adjustment screw is electrically conductive to the contacts. Therefore, to revent an electric shock always use insulated tools and only
monitor the circuit with a digital multimeter or low voltage (<12 VDC) LED lights while adjusting the set oints. Never contact any wire, cable,
connector in or terminal blade with a conductive ortion of the adjusting tool while adjusting the switch.
Tools Required: A 5/32" (4 mm) security style hex key is required to adjust the set oint. The security hole must be 0.102" (2.6 mm) diameter minimum
with a 0.13" (3.3 mm) minimum de th . The use of a standard 5/32" (4 mm) hex key will cause damage to the actuator ti and revent the user from
achieving the high end of the set oint range due to the hex key "camming" out.
1. Accessing the Adjuster: Remove the black silicone rubber ca . See the enclosed configuration drawing for the location based on the s ecific model. It
is either between the two terminal blades on units with S ade or Terminal Screw terminations or located between the wire exits on units with flying
leads.
2. Adjusting the set oint: Insert the hex key and rotate slightly in either direction until the hex flats engage. Increase the ressure a lied to the switch
while monitoring both the ressure and the continuity of the switch. Note the ressure at which the continuity changes (circuit o en to closed for A
circuits; circuit closed to o en for B circuits). Lower the ressure back to ambient. If the set oint desired is higher than the noted ressure, turn the
hex key clockwise to increase the set oint. Raise the ressure again until the continuity changes. Note the new set oint. Decrease the ressure to
ambient. If the set oint is now lower than desired, rotate the hex key counterclockwise to lower the set oint. Kee raising and lowering the ressure
and rotating the hex key until the desired set oint is obtained. This ty ically takes a few attem ts to achieve the target set oint. Best results are
obtained if small (less than 1 turn) rotational movements of the adjustment screw are made at one time. The adjustment range is engraved on the
hex flats of the switch for reference. Any rising or falling set oints can be obtained within the range listed with ro er adjustment.
Field Locking of the Adjustment Screw (if req'd): The adjustment screw is self-locking from the factory. However, in high vibratory and a lications
where the field adjustment will be re etitive, it may be desirable to increase the factory's self-locking breakaway torque. Gems recommends that 1
dro of Loctite (r) 290 dis ensed from an 0.020" diameter syringe ti be a lied to the adjustment screw and it's electrical housing interface.
Warning: Loctite 290 is a enetrating Loctite. Therefore, it is critical to revent Loctite from being a lied to the center of the adjustment screw where
the actuator slides or any surface of the adjustment screw hex socket. A lication in these areas could render the switch ino erable. The
a lication of more than 1 dro may allow Loctite to enetrate into the interior of the switch which could also cause switch malfunction.
3. Verification of set oint: Verify the new set oint by slowly increasing and decreasing the ressure (or vacuum) while monitoring the electrical contacts.
Re eat the adjustment rocedure if necessary to obtain the desired set oint.
4. Re lace the Adjustment Screw Ca : After adjusting the set oint and locking the screw (if req'd), insert the black silicone rubber ca firmly into the
adjustment screw access hole.
Warning: Failure to re lace the adjustment screw ca may allow ingress of foreign matter which could cause switch malfunction. In addition, the IP
ratings will not a ly to a switch without a ro erly a lied adjustment screw ca .
Danger: Failure to re lace the adjustment screw ca will ex ose the user to the electrically live adjustment screw.
Performance: Notes
1
Re eatability and set oint of units will vary de ending on tem erature, fluid viscosity and cycle rate. Long term inactuation will lead to a higher initial
set oint reading due to the non-linear behavior of the elastomer seals. Fluids with low and stable viscosities over the ex ected tem erature range will
exhibit better erformance.
2
Deadband values are an a roximation at room tem erature with a 100 C fluid. At lower tem eratures and / or higher fluid viscosities the deadband
will be much larger than the value shown. At high fluid tem erature and a ra id cycle rate, the deadband may be lower than the a roximations given.
Please consult the factory if s ecific statistical analysis is required.
TABLE I
PRESSURE RANGE CODES AND PERFORMANCE
Pressure Range
Code Pressure Range Re eatability
1
Average Deadband
2
10 510-1235 sig (35-85 BAR) +/- 30 si (2.1 Bar) +4% of setting 16% of setting
20 800-1960 sig (55-135 BAR) +/- 48 si (3.3 Bar) +4% of setting 13% of setting
30 1835-3115 sig (125-215 BAR) +/- 110 si (7.6 Bar) +6% of setting 24% of setting
40 2970-4350 sig (205-300 BAR) +/- 190 si (13.1 Bar) +6% of setting 20% of setting

Im ortant Points:
• Gems roducts must be maintained and installed in strict accordance with the National Electrical Code and the a licable Gems roduct
instruction Bulletin that covers installation, o eration, and ro er maintenance. Failure to observe this information may result in serious
injury or damages.
• For hazardous area a lications involving such things as, but not limited to, ignitable mixtures, combustible dust, and flammable
materials, use an a ro riate ex losion roof enclosure or intrinsically safe interface device.
• Please adhere to the ressure and tem erature limitations shown throughout this catalog. These limitations must not be exceeded. These
ressures and tem eratures take into consideration ossible system surge ressures/tem eratures and their frequencies.
• Selection of materials for com atibility with the media is critical to the life and o eration of Gems roducts. Take care in the ro er
selection of materials of construction; Testing is required.
• Our sensors have been designed to resist shock and vibration. However, shock and vibration should be minimized.
• Electrical entries and mounting oints in an enclosed tank may require liquid/va or sealing.
• Our sensors must not be field-re aired.
• Physical damage sustained by roduct may render it unserviceable.
Return Policy
Returns are acce ted on stock items u to 30 days from date of order. You must contact our Returns De artment for a Return Authorization
(RA) number. Return the goods—freight re aid— in the original container and include original acking sli . COD returns are not acce ted.
Gems reserves the right to a ly restocking charges.
Gems Sensors & Controls | One Cowles Road | Plainville, CT 06062-1198
Tele hone: 1-800-378-1600 | Email: [email protected] | www.GemsSensors.com
Pressure Equi ment Directive
The ressure switch is designed and manufactured in accordance with Sound Engineering Practice as defined by the Pressure Equi ment
Directive 97/23/EC. This ressure switch must not be used as a “safety accessory” as defined by the Pressure Equi ment, Article 1, Paragra h
2.1.3
The CE mark on the unit does not relate to the Pressure Equi ment Directive.