Omega Home Security System WMS T AL User Manual

Users Guide  
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WMS-T-AL  
Dual Set Point Temperature Alarm  
 
WMS-T-AL Dual Set Point Temperature Alarm  
Introduction  
The WMS-T-AL is a microprocessor-based dual set point Temperature Alarm packaged in a  
NEMA 4X box with a transparent cover. It has been designed with two independently  
controlled relays. The relays are used to control power to the users temperature sensitive  
device(s) or to operate operator selected secondary alarms. The control module has a liquid  
crystal digital display and push buttons for viewing and selection of the operating mode and  
the alarm threshold values. The user can control three parameters for each alarm channel:  
Threshold delay before the relay triggers after threshold temperature is crossed, and delay time  
before the relay turns off after the temperature re-crosses the threshold . Each relay can be used  
in either the normally open or the normally closed mode. A piezoelectric buzzer in the control  
module can be activated to turn on when ever the alarm state is active.  
General Description  
The WMS-T-AL consists of two components a temperature sensor to measure temperature and  
a control module.  
TEMPERATURE SENSOR  
The temperature sensing probe is based on a precision thermistor and is designed to measure  
over a wide range of temperatures. The thermistor has a resistance value of 10,000 ohms at 25°C  
and has a highly reproducible response curve. The sensor accuracy is 1°F ( 0.55°C). Resolution  
is to 0.1°F (0.05°C). The measurement range is from -40°F (-40°C) to 160°F (60°C). The Alarm  
range is from -40°F (-3°C) to 160°F (+3°C). The temperature sensor is supplied with a 40 ft.  
Cable.  
CONTROL MODULE  
The function of the Control Module is to activate its control relays when ever user selected  
temperature vales are reached and sustained for user determined periods of time. The Control  
Module is microprocessor based and is controlled via push buttons and a two-row-liquid-  
crystal-display. There are Option Switches on the printed circuit board for selection of  
temperature units (°F or °C) , for enabling the audible alarm, and a potentiometer for  
controlling the LCD contrast.  
User Interface  
There are two modes of operation for the model WMS-T-AL Temperature Alarm. RUNNING  
and PAUSED. The RUNNING mode is the normal operating mode when the unit is initially  
powered up. The PAUSED mode is any state other than the normal OPERATING mode.  
Pressing any button during the RUNNING mode will place the unit in the PAUSED mode.  
1
 
MENU STRUCTURE  
The user interface contains the following menu items:  
Temperature Alarms  
• Alarm Delays  
• Maximum/Minimum Temperature  
The MENU Button  
The MENU button will take the unit out of the RUNNING mode and allow the user to change  
the operating parameters and view maximum values.  
Once the MENU button has been pressed the user may use the UP and DOWN buttons to scroll  
through the menu.  
Subsequent presses of the MENU button will bounce the cursor between editable fields of any  
menu item, where applicable. When in an editable field, the cursor will become a blinking  
block.  
The GO Button  
The GO Button always returns the unit to the RUNNING mode, regardless of where the user  
may be in the menu structure.  
The UP and DOWN Buttons  
The UP and DOWN buttons control either of two things:  
1. Scrolling through menu items when the user is not in an editable field.  
2. Scrolling through user selectable values when the user is in an editable field.  
The CLEAR Button  
Pressing the CLEAR button performs the following actions:  
1. If the user is in an editable field, the field will be set to 0.  
2. It the user is viewing the maximum/minimum temperature value, the recorded  
value will be cleared.  
3. If the unit is alarming, all delay counters will be cleared.  
ALARM Features  
The WMS-T-AL Temperature Alarm provides the following alarm features:  
• Two independent temperature alarms  
• Programmable On and OFF delays  
• Pausing of alarm when any key is pressed  
2
 
• When audible, Alarm 1 will produce a beep at 400 ms intervals while Alarm 2 will  
beep at 200 ms intervals.  
• When the alarms are in the audible mode and both alarms are active, Alarm 2 will  
have precedence.  
• The alarm can be put into the silent mode by moving Switch 4 to the off position on  
the switch block at the bottom of the circuit board. It is necessary to re-boot the  
WMS-T-AL after moving the switch in order to in able the change.  
Units of Measure  
It is possible to display temperature values in either °F or °C units. Selection of the unit system  
to be used is done with Switch 3 on the switch block at the bottom of the circuit board. The Off  
position is for °F and the On position is for °C. It is necessary to re-boot the WMS-T-AL after  
moving the switch in order to in able the change.  
Temperature Sensor Placement  
The validity of temperature signals can be compromised by the choice of the location of the  
anemometer with respect to the surrounding terrain. Placement of the temperature sensor  
should follow standards established by agencies such as the World Meteorological Organization  
(WMO) and the National Oceanic and Atmospheric Administration’s (NOAA) National  
Weather Service (NWS).  
Temperature Inputs  
The temperature inputs are P17, TMP1 and P18, TMP2.  
Power Supply  
Use a 12V AC or DC power supply on the ACin/DCin and ACin/DCgnd terminals.  
Earth Ground  
Attach a wire of at least 18 AWG or larger to the EARTH terminal. The other end of this wire  
must be attached to a metal water pipe or a copper-ground-rod. This is the ground path for all  
of the lightning and electrostatic protection devices incorporated on the WMS-T-AL circuit  
board. It is very important that this earth ground connection is made! Your WARRANTY may  
be voided if the earth ground connection is not made.  
3
 
QUICK START  
Before permanently installing the WMS-T-AL it is advisable to “bench testit to gain familiarity  
with its operation. The test is conducted in the following manner.  
Attach the temperature sensor leads to the terminals on the WMS-T-AL circuit board labeled  
TMP1 and TMP2.  
Attach 12V dc or ac to the terminals on the WMS-T-AL circuit board marked AC in/DC in and  
AC in/DC gnd.  
When the WMS-T-AL circuit board is energized the LCD is activated and it will display the  
temperature on the first line and the alarm set point values on the second line.  
There are five con  
trol buttons next to the LCD. These are used to set the alarm thresholds for the  
two alarms, to set the delay times between the time that the temperature crosses the alarm  
threshold and when the alarm state changes conditions, and to clear the maximum and  
minimum temperature value in the temperature log. The default condition for the temperature  
alarms is 75°F.  
Both the on-delay and the off-delay default values are 15 seconds.  
To change the temperature alarm threshold value press the Menu button. The top line of the  
display will change from “Temp XX.X (°F)” to “Temp Alarms (°F)”. Press the Menu button  
again and the cursor moves over the Alarm 1 temperature value. Press the Up or Dn button to  
increment or decrement the alarm threshold value for Alarm 1. Press the Go button to return to  
the RUNNING mode. Repeat the process for Alarm 2.  
To Change the Alarm On and Alarm Off delays, with the unit in the RUNNING mode press the  
Menu then press the Up button until the “Alarm Delays (s)” menu appears. Press the Menu  
button and the cursor will move to the “ON: XX” field. Then Press the Up or Dn button to  
increment or decrement the On delay value to the desired value. Press the Menu button again  
to advance the cursor to the “OFF: XX” field and adjust the value with the Up or Dn button.  
Press the Go button to return to the RUNNING mode.  
To view the Minimum and Maximum Temperature registers from the RUNNING mode press  
the Menu button, then press the Up button until the “Temps (°F)” screen is displayed and the  
second line will show the minimum and maximum temperatures obtained since the last reset.  
To reset the maximum wind speed value to zero press the Clr button. Press the Go button to  
return to the RUNNING mode.  
This concludes the series of quick start tests.  
4
 
SPECIFICATIONS  
Sensor Unit  
Sensor  
Thermistor, 10K ohms  
Accuracy: 1°F @ 77°F  
Alarm Delay Range ON or Off  
0 - 99 seconds  
Controls  
Four, push buttons select:  
1. Run or Pause mode  
2. Menu Select  
3. Increment  
4. Decrement  
Option slide switch: (Switches are read only during power-up.)  
Switch 1: ON = TEMPERATURE  
Switch 2: N.A  
Switch 3:  
ON = °C; OFF = °F  
Switch 4: ON = Audible alarms, OFF = Silent alarms  
5
 
NOTES:  
 
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 WARRANTY 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; misapplication; misuse or other operating  
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not  
limited to contact points, fuses, and triacs.  
OMEGA is pleased to offer suggestions on the use of its various products. However,  
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any  
damages that result from the use of its products in accordance with information provided by  
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the  
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR  
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF  
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY  
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF  
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of  
OMEGA with respect to this order, whether based on contract, warranty, negligence,  
indemnification, strict liability or otherwise, shall not exceed the purchase price of the  
component upon which liability is based. In no event shall OMEGA be liable for  
consequential, incidental or special damages.  
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  
applications 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  
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN  
(AR) NUMBER FROM OMEGAS 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:  
FOR NON-WARRANTY REPAIRS, consult OMEGA  
for current repair charges. Have the following  
information available BEFORE contacting OMEGA:  
1. Purchase Order number under which the product  
was PURCHASED,  
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 make running changes, not model changes, whenever an improvement is possible. This affords  
our customers the latest in technology and engineering.  
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.  
© Copyright 2007 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,  
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the  
prior written consent of OMEGA ENGINEERING, INC.  
 
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