Omega Home Security System PSW 31 User Manual

User’s Guide  
www.omega.com  
e-mail: info@omega.com  
PSW 3 1 SERIES  
ELECTRONIC PRESSURE SWITCH FOR PNEUMATIC APPLICATIONS  
 
ELECTRONIC PRESSURE SWITCH FOR PNEUMATIC APPLICATIONS  
PSW31 Series  
APPLICATION  
Ideal for Control of Filtered Compressed Air,  
Lubricated or Non-Lubricated  
FEATURES  
Real-Time LED Status Display of Pressure  
Adjustable Hysteresis  
Off-Line Calibration  
Fast, Accurate Response  
Extensive Service Life  
SPECIFICATIONS  
Ports/ Mounting Plate  
Adjustment Range  
Maximum Pressure  
Temperature Rating  
Ambient  
1/ 4" NPT  
-14 to 350 PSI (-1 to 25 bar)  
See Part Number Identification Table  
.43  
(11)  
14° to 140° F (-10° to 60° C)  
14° to 175° F (-10° to 80° C)  
Media  
Temperature Sensitivity  
@ Zero Point  
Set Point Shifts 0.4% of FS/ 10°C  
1.85 (47)  
1.18 (30)  
@ Set Point Pressure Set Point Shifts 0.3% of FS/ 10°C  
Electronics  
Pressure Sensor, Microprocessor  
Evaluation Circuitry and  
Solid-state Output Driver  
Switching/ Reset Point  
Linearity  
Electrical Connector  
Adjustable between 0 – 100% of FS  
< 0.5% of Final Value ± 1 digit  
DIN Style Plug with Removable  
Cable Plug Adapter  
Ø.31 (8)  
MATERIALS OF CONSTRUCTION  
Housing  
Die-Cast Zinc  
.05 (1.2)  
.79 (20)  
1.18 (30)  
All dimensions in inches (mm)  
 
ELECTRONIC PRESSURE SWITCH FOR PNEUMATIC APPLICATIONS  
ELECTRICAL PARAMETERS  
Electrical connection  
DIN 43650 Table A  
18 to 32V DC  
10% (within 18 to 32V)  
<50 mA (plus load current)  
Power supply (polarity safe)  
Permissible residual ripple  
Current consumption  
DIN 43650  
1
+24V  
3 Uout Imax = 1A  
Micro-  
Controller  
E2PROM  
(SP,RP)  
p
=
Load  
0V  
PE  
2
I
SP RP  
SWITCHING OUTPUT  
Switching mode  
Open collector PNP switched to supply  
(suited for inductive load)  
Output voltage  
Contact rating  
Supply voltage minus 1.5V (approx)  
I
= 1A (short-circuit proof)  
max  
Switching time  
Service life  
< 5ms  
100 million switching cycles  
Switching logic  
Signal “on” with rising pressure, if SP* > RP**  
Signal “on” with falling pressure, if SP < RP  
* SP = Switching point  
**RP = Reset point  
PART NUMBER IDENTIFICATION  
SWITCHING  
STEP  
PART  
NUMBER  
PRESSURE  
RANGE – PSI  
MAXIMUM  
PRESSURE  
SIZE OF  
DISPLAY*  
PSW31B  
-14 – 15  
0 – 145  
0 – 350  
145  
440  
580  
0.14  
0.6 – 0.7  
1 – 2  
PSW31C  
PSW31D  
*Pressure display in PSI  
 
I N S T R U C T I O N  
M A N U A L  
supply is switched on. Release this button  
Case 2  
ADJUSTING THE SWITCHING POINTS (SP)  
again after the power supply has been  
switched on. The display will then show the  
buffering time in milliseconds (e.g. 03) or  
seconds. The cursor buttons M, M can be  
used to set the buffering time to 03, 06,  
12, 24 or 50 ms or 0.1, 0.2 or 0.4  
seconds. When this has been done, press  
SP to store the setting.  
Positive hysteresis  
1
AND RESET POINTS (RP)  
Switching point  
0
a) Adjusting the switching point.  
p
Case 1  
or Case 2  
f) Window mode  
Q
Q
If it is desired to monitor whether the pressure  
lies within a certain range, a switching window  
can be created for this purpose. The pressure  
switch will then indicate cases in which the  
actual pressure lies above or below this area.  
In order to set a switching window, the two  
buttons SP and M must be pressed  
simultaneously before the power supply is  
switched on.  
d) Setting the pressure switch to ambient  
pressure = 0.  
Since ambient pressure varies according to  
altitude, the user may re-calibrate the zero  
point to match local conditions.  
p
p
Press and hold the SP button. The display  
will show the previous switching pressure  
setting, and the dotted bar will flash while  
the button is pressed down (case 1).  
Press the button RP before the power  
supply is switched on. Release this button  
again after the power supply has been  
switched on and the display test has run.  
The display will then show "OFS". The  
cursor buttons M, M can be used to set the  
pressure display to 0. When this has been  
done, press SP to store the setting.  
Release these buttons again after the power  
supply has been switched on and the display  
test has run. The display will then show the  
operating mode.  
You can now use the cursor keys to adjust  
the switching point upwards or downwards.  
If a cursor key is held down, the values will  
change faster. When the cursor key is  
released again, the switch-on pressure  
setting will cease to change. This setting is  
stored and activated when the SP button is  
released, after which the display will show  
the current pressure value and the bar will  
quit flashing.  
The cursor buttons M,M can now be used to  
change the operating mode until "FEn"  
e) Hysteresis mode  
(standing for "Window") in the display. When  
this has been done, press SP to store the  
setting. The button SP can be used to display  
the switching-point setting, which can be  
modified by means of the cursor buttons M, M.  
If it is desired to operate with a fixed  
hysteresis value instead of the reset point,  
this value can be selected as desired.  
In order to set a hysteresis value, the two  
buttons SP and M must be pressed  
simultaneously before the power supply  
is switched on.  
b) Adjusting the reset point.  
The distance between the switching point and  
reset point is the switching window. If the  
switching point is lower than the reset point, a  
signal will be output as long as the pressure  
lies within the preset window (case 1, rising  
pressure). If the switching point is higher than  
the reset point, a signal will be output as long  
as the pressure lies outside the preset window  
(case 2, rising pressure). In the case of falling  
pressure, the signal is inverted.  
Case 3  
or Case 4  
Release these buttons again after the  
power supply has been switched on and the  
display test has run. The display will then  
show the operating mode. The cursor  
buttons M,M can now be used to change  
the operating mode until "HYS" appears in  
the display. When this has been done,  
press SP to store the setting.  
Q
Q
p
p
Press and hold the RP button. The display  
will show the previous reset pressure  
setting, and the dotted bar will flash while  
the button is pressed down.  
Case 1  
The SP button can be used to display the  
switching-point setting, which can be  
modified by means of the cursor buttons  
M,M.  
On = Pressure within window  
1
You can now use the cursor keys to adjust  
the reset point in the same manner as  
described above.  
The button RP can be used to display the  
hysteresis setting, which can also be  
modified by means of the cursor buttons  
M,M.  
During both adjustment operations, it may  
occur that the hysteresis graph changes  
from one state to another at the time a  
transition is made through the point  
"Switching pressure = Reset pressure".  
When both points are correctly set, the  
hysteresis graph will also be correct. You  
can change between SP and RP as often as  
you wish until the settings are correct.  
0
p
SP  
<
RP  
Case 2  
Negative hysteresis means: Signal “on”  
with rising pressure (case 1).  
Off = Pressure within window  
1
Positive hysteresis means: Signal “on” with  
falling pressure (case 2).  
If the switching point is modified, this will  
automatically also result in a change in the  
reset point by a value equal to the  
hysteresis setting.  
c) Setting a buffering time.  
In order to prevent brief pressure “spikes”  
or “surges” from causing undesired  
0
p
RP  
<
SP  
Case 1  
switching, a buffering time can be entered.  
The effect of this is that pressure changes  
are evaluated only if the pressure signal in  
question is present for longer than the  
buffering time. In order to set a buffering  
time, press the button SP before the power  
Std  
=
Standard mode, switching and reset  
points adjustable  
Negative hysteresis  
1
HYS = Hysteresis mode, switching point and  
hysteresis adjustable  
FEn  
=
Window mode, switching window  
adjustable  
Switching point  
0
p
 
Switching Characteristic Graphs  
Signal “off” with falling pressure  
Signal “off” with rising pressure  
Signal “on” with rising pressure  
Signal “on” with falling pressure  
Setting RP < SP  
Setting RP > SP  
Setting SP* > RP**  
Setting SP < RP  
p
p
RP  
p
p
SP  
SP  
RP  
RP  
SP  
RP  
SP  
t
t
t
t
UA  
UA  
U
U
* SP = Switching point  
t
t
t
**RP = Reset point  
t
Explanation:  
When the switching point (SP) is adjusted HIGHER than the reset point (RP), then the switching output will be “normally off”.  
When the switching point (SP) is adjusted LOWER than the reset point (RP), then the switching output will be “normally on”.  
Position of operating elements  
E R R O R M E S  
Display of hardware errors or malfunctions  
Display Meaning Cause / Remedy  
S
A G E S  
O.Er  
Output error  
Error at switching output: Circuit-breaker defective, feedback loop  
to processor open circuit. Repair necessary.  
Pressure display  
2
2
E.Er  
I.Er  
E PROM error  
E PROM module defective or connection to processor faulty.  
Repair necessary.  
Switching  
function graph  
Initialization error Checksum of initialization data incorrect. Remedy: Call up any  
SETUP function and acknowledge the setting with SP.  
Switching output LED  
This error message is caused by a data error. All setup values  
should therefore be checked and corrected if necessary.  
Switching point button  
Reset point button  
Raise switching  
or reset point button  
C.Er  
Calibration error  
Short-circuit low  
Checksum of calibration data incorrect. Recalibration necessary.  
SC.L  
Short-circuit between output and ground. Check wiring:  
Power supply may be too weak for connected load (leading  
to collapse of voltage, particularly with loads with a high switch-on  
current such as incandescent lamps or capacitances).  
Lower switching  
or reset point button  
UFL  
OFL  
Underflow  
Overflow  
The applied pressure is below the measuring range:  
Increase pressure until it is within the measuring range.  
The applied pressure is above the measuring range:  
Decrease pressure until it is within the measuring range.  
Display of hardware errors or malfunctions (can be switched off)  
Display Meaning Cause / Remedy  
SC.H  
Short-circuit high Short-circuit between output and power supply. Check wiring.  
If the switching line from the load (e.g. electrical control  
device, PLC or similar) is being held at an open-circuit  
potential of > 3V, or if several pressure switches are being  
operated in parallel, this function should be switched off.  
Disconnection: M during display test, then adjust with M or M.  
U.Lo  
Voltage low  
Power supply voltage too low (<17V).  
Check power supply: Load may be too large.  
Disconnection: M during display test, then adjust with M or M.  
Messages generated by calling SETUP functions  
Cod  
CLC  
txx  
Meaning  
Requested code or code programming  
Deletion of current code  
Clear code  
Delay time  
(Buffering time)  
Setting of filter time constant  
xx = Switching output delay  
xx {03, 06, 12, 24, 50} in ms and  
xx {O.1, 0.2, O.4} in s.  
OFS  
Offset  
Request for offset adjustment using M and M buttons  
Short-circuit monitoring activated  
Voltage monitoring activated  
SC.H  
U. LO  
OFF  
Short-circuit high  
Voltage low  
Off  
Short-circuit or voltage monitoring deactivated  
Std  
HYS  
FEn  
Standard mode  
Hysteresis mode  
Window mode  
Standard mode activated  
Hysteresis mode activated  
Window mode activated  
U-C  
I-C  
Voltage calibration  
Current calibration  
Voltage output selected  
Current output selected  
 
WARRANTY/DISCLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period  
of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace period to the  
normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers  
receive maximum coverage on each product.  
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department  
will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by  
OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY  
does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling,  
improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WAR-  
RANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been  
damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; mis-  
application; misuse or other operating conditions outside of OMEGA’s control. Components, which wear, are not  
warranted, including but not limited to contact points, fuses, and triacs.  
OMEGA is pleased to offer suggestions on the use of its various products. How ever, OMEGA neither  
assum es responsibility for any om issions or errors nor assum es liability for any dam ages that result  
from the use of its products in accordance w ith inform ation provided by OMEGA, either verbal or  
w ritten. OMEGA w arrants only that the parts m anufactured by it w ill be as specified and free of  
defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSO-  
EVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING  
ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HERE-  
BY DISCLAIMED. LIMITATION OF LIABILITY: The rem edies of purchaser set forth herein are exclusive,  
and the total liability of OMEGA w ith respect to this order, w hether based on contract, w arranty, neg-  
ligence, indem nification, strict liability or otherw ise, shall not exceed the purchase price of the  
com ponent upon w hich liability is based. In no event shall OMEGA be liable for consequential, inci-  
dental or special dam ages.  
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic  
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical appli-  
cations or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical  
application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic  
WARRANTY / DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA  
harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.  
RETURN REQUESTS / INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURN-  
ING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER  
FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The  
assigned AR number should then be marked on the outside of the return package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage  
in transit.  
FOR WARRANTY RETURNS,  
please have the following information available  
BEFORE contacting OMEGA:  
1. Purchase Order number under which the  
product was PURCHASED,  
FOR NON-WARRANTY REPAIRS, consult  
OMEGA for current repair charges. Have the following  
information available BEFORE contacting OMEGA.  
1. Purchase Order number to cover the COST  
of the repair,  
2. Model and serial number of the product  
under warranty, and  
3. Repair instructions and/or specific problems  
relative to the product.  
2. Model and serial number of the product, and  
3. Repair instructions and/or specific problems relative  
to the product.  
OMEGA’s policy is to m ake running changes, not m odel changes, whenever an im provem ent is possible.  
This affords our custom ers the latest in technology and engineering.  
OMEGA is a registered tradem ark of OMEGA ENGINEERING, INC.  
©Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This docum ent m ay not be copied, photocopied,  
reproduced, translated, or reduced to any electronic m edium or m achine-readable form , in whole or in part, without  
the prior written consent of OMEGA ENGINEERING, INC.  
 
W h e re Do I Fin d Eve ry th in g I N e e d fo r  
Pro ce ss Me a su re m e n t a n d Co n tro l?  
O MEGA...O f Co u rse !  
TEMPERATURE  
M Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies  
M Wire: Thermocouple, RTD & Thermistor  
M Calibrators & Ice Point References  
M Recorders, Controllers & Process Monitors  
M Infrared Pyrometers  
PRESSURE, STRAIN AN D FO RCE  
M Transducers & Strain Gages  
M Load Cells & Pressure Gages  
M Displacement Transducers  
M Instrumentation & Accessories  
FLO W / LEVEL  
M Rotameters, Gas Mass Flow Meters & Flow Computers  
M Air Velocity Indicators  
M Turbine/ Paddlewheel Systems  
M Totalizers & Batch Controllers  
p H/ CO N DUCTIVITY  
M pH Electrodes, Testers & Accessories  
M Benchtop/ Laboratory Meters  
M Controllers, Calibrators, Simulators & Pumps  
M Industrial pH & Conductivity Equipment  
DATA ACQ UISITIO N  
M Data Acquisition & Engineering Software  
M Communications-Based Acquisition Systems  
M Plug-in Cards for Apple, IBM & Compatibles  
M Datalogging Systems  
M Recorders, Printers & Plotters  
HEATERS  
M Heating Cable  
M Cartridge & Strip Heaters  
M Immersion & Band Heaters  
M Flexible Heaters  
M Laboratory Heaters  
EN VIRO N MEN TAL  
MO N ITO RIN G AN D CO N TRO L  
M Metering & Control Instrumentation  
M Refractometers  
M Pumps & Tubing  
M Air, Soil & Water Monitors  
M Industrial Water & Wastewater Treatment  
M pH, Conductivity & Dissolved Oxygen Instruments  
M-3346/ 0700  
 

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