Sigma Controls, Inc.
217 S. 5th St. Perkasie, Pa 18944
phone 215.257.3412 - fax 215.257.3416

Sigma Controls

Frequently Asked Questions

How do you pronounce Myriad?

Pronunciation; MEER·ee·ad

 1.   (adj.) Composed of numerous diverse elements or facets: the myriad life of the metropolis.
2.   (n.) Constituting a very large, indefinite number; innumerable: the myriad of fish in the ocean.
3.   (n.) Sigma Controls’ versatile controller. Can be used for a myriad of control applications

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I have installed a Myriad DPC (Duplex Pump Controller). Why isn't it turning on the pump?

First you should read the manual you can download it here:

1.   You must have a good signal from the sensor. Usually this is a submersible level transducer. The main (startup) display shows this value.
2.   The lead on and lead off points must be set so that the controller knows when to call for a pump. These are found by going to MENU 1 and then selecting SETPNTS.
3.   There should be jumpers installed for the negative DC power. These are shown on the drawing in the manual. Basically you must connect all of these terminals together. CAI, 1DC, 2DC, 3DC, 4DC, and CAO.
4.   Field components must be installed or jumpers must be used in their place.
    * Run Feedback - Supply a +24 volts signal to 1DI and 2DI that comes on when the pumps are running. Otherwise put a jumper from V24 to 1DI and 2DI.
    * Critical Alarms - Supply a +24 volts signal to 3DI and 4DI that drops out when the pumps should shutdown. Usually this is a contact from a motor starters overload relay or a over temperature sensor . Otherwise put a jumper from V24 to 3DI and 4DI.
    * Auto Switch - Supply a +24 volt signal to 1AI and 2AI that comes on when the pumps are enabled to run. Usually this is a contact from a OFF / ENABLE or a HAND / OFF / AUTO switch (in the auto position). Otherwise put a jumper from V24 to 1AI and 2AI.
5.   The diagnostic screen can be helpful in verifying these signals. !!INSERT DOCUMENT LINK HERE!!

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Submersibles Level Sensors ( Submersibles Level Sensors )
Which model should I use?

o The model 6100 is the standard in wastewater. It has a large sensing surface. It is rugged and handles turbulent processes well. It should be used where solids are present in the liquid.
o The model 6200 is also has a large sensing surface but not as large as the 6100. It is a more cost effective alternative to the 6100. It should be used where solids are present in the liquid and the 6100 cannot be used because of available space.
o The model 6000 is the standard in clear wells (drinking water wells, ponds, tanks, lakes etc.). It has a 1.25” thickness. It is rugged and has a thick stainless steel body. It should be used where width is not an issue.
o The model 8000MP is for use in many submersed applications. It is very accurate and it is temperature compensated form 0 – 50 Deg C. It has a 1.00” diameter. It has a stainless steel body. It should be used where the temperature of the liquid varies or where high accuracy is desired.
o The model 5000 is a very small diameter sensor for use in water wells. It has a .690” thickness. It has a stainless steel body. It should be used where the width of the 6000 and 8000 are too large.
o The model 7000 the same as the 6000 except is made of PVC. It ha

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What does the "MP" part of the model number mean?

Microprocessor based electronics. As opposed to analog circuitry. The MP units measure temperature as well as pressure. This allows the output to be kept within tolerance over a 0 – 50 Deg C range. The MP boards are capable of digital communication with other devices. Communication options must be selected when ordering.

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Can I cut the cable?

The cable is a conduit for the four wires, but it is also an air vent for the sensor. IT IS VERY IMPORTANT THAT THE END OF OUR CABLE BE IN A DRY PLACE. If water or high levels of condensation get inside this cable, the unit it will be damaged THIS IS NOT COVERED UNDER WARRENTY. As long as the cable end is in a dry place, the cable can be cut and re-connected.

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Does it need a desiccant bag?

 We don’t use a bag. If high levels of condensation are present at the end of the cable then use our Sigma R.D.E.  Rechargeable Desiccant Enclosure.

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What are the blue and yellow for?

They are for digital communication with other devices. Communication options must be selected when ordering. Do not connect anything to these wires unless you have ordered communication options and you have consulted a wiring diagram for proper installation.

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How do I mount it?

There are several options available depending on the model. These are the most common.
o Most of our sensors are installed by hanging the unit by its cable. Often a strain relief is used so that the cable is not crimped at the hanging point. It is not uncommon to hang a sensor 500 ft down a well with no additional support other than the cable.
o SB Option – The cable support bracket is attached to the sensor. Stainless steel cable is attached to the bracket and run along side of the submersible cable. This allows the sensor to be pulled up by the stainless steel cable. This prevents the sensor from being separated from the cable when being removed from an installation where the sensor may be restricted. SB options must be selected when ordering.
o CD Option – The conduit adapter allows the senor cable to be run inside conduit while rigidly holding the sensor in place. ½ “conduit with a male threaded end or fitting is screwed into the top of the sensor. The conduit can be mounted using standard electrical hardware. CD options must be selected when ordering.
o SO Option – The Standoff adapter allows the model 6100 to be elevated from the floor. The whole assembly can then be set on the floor of the pit. SO options must be selected when ordering

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4-20ma Loop Signal ( 4-20ma Loop Signal )
How does it work?

The Four-to-Twenty Milliamp Circuit is the most common way to transfer an instrumentation signal from one device to another using only two wires. 4 milliamps would usually translate to a zero value and 20 milliamps would be some full-scale value. For example, if we want to keep track of the level of water in a 16' storage tank, 4 mA would mean the tank was empty, 20 mA would be full, and each milliamp in between would translate to one foot of water. A transmitter at the tank would sense the level by pressure and translate that into the 4-20 mA instrumentation signal and send it to a gauge or a chart recorder in a control room. The circuit is commonly powered by a 24 volt DC supply.

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How do I test if my sensor is working?

Sigma sensors connected to user-supplied indicating and or controlling equipment.

    1) Equipment does not turn on:
        a) Check for proper supply voltage to the indicator / controller (120VAC, 240VAC, or other).
        b) Check fuses, if any.
        c) Check Wiring terminations.
    2) Equipment operates, but no level is indicated, or indicated level is totally incorrect:--
        a) Check polarity of sensor leads, red to positive terminal, black to negative.
        b) Test for DC voltage across sensor lead connections; minimum 13VDC, nominal 24VDC, maximum 45VDC.
        c) Determine input signal required by equipment.  4-20MA, 1-5VDC, 1-10VDC?
        d) Lift sensor several feet in well.  Does the indicated level change?
            Yes:  Equipment not calibrated for the range of 4-20MA output of the sensor. Check sensor calibration sheet supplied with manual.  Recalibrate equipment.            
            No:    Possible wiring errors, see Manual open surge protector, damaged sensor.
    3) Equipment works, but indicated level is incorrect, (major or minor error).
        a) Level indication changes when cable pulled to raise and lower sensor, and calibration is correct.  Sensor is not at required depth; or level is not anticipated height.
        b) Pulling cable up to raise, then lower, sensor does not affect indication.  Sensor probably hung-up and not completely down well; continue pulling the cable out until sensor is freed.  Re-lower sensor to proper depth.

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Control Panels ( Control Panels )
If I buy your product can you put them in a box for me?

Yes, Sigma Controls has manufactured custom and standard control panels since 1985. From conceptual design to finished product, Sigma Controls can handle the smallest to the largest control panel project. Utilizing our own microprocessor based controller (Myriad Series) any industrial programmable controller (PLC) or simple relay logic, a control panel can be fabricated to meet the specific job requirements. All Sigma control panels are designed to meet all applicable national and local standards NEC, FPA, and NEMA. We are a UL508A certified facility and can certify any panel as a listed, serialized UL assembly.

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Business Hours ( Business Hours )
Business Hours

Monday to Friday 8:00 am to 5:00pm EST
During holidays our answering machine may provide cell phone numbers for emergency contacts.

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Warranty ( Warranty )
Warranty Info

All Sigma Controls, Inc. products are warranted to be free from defective materials and workmanship for one (1) year from date of shipment. Sigma reserves the right to repair or replace at its option any product found to be defective. In no event shall Sigma Controls, Inc. be liable for any consequential, incidental, or special damages and the limit of its liability shall not exceed the purchase price of the supplied equipment.




Return status can be determined upon factory inspection of returned equipment.

A completed Return Authorization form must accompany all items returned for repair.

Repairs will be evaluated as quickly as possible. Cost for non-warranty repairs will be provided before repairs are initiated and repairs will be completed only after approval by customer.

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Sales ( Sales )
Can I buy direct or should I go through a Rep

If there is a representative in your area you should call them first. Otherwise we can accept direct orders.

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Do you accept credit cards?

Yes, we can take major credit card orders over the phone or you can buy directly from our online store

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Do you offer discounts?

Yes, certain discounts apply depending on quantity and other factors please call to discuss.

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Email Support ( Email Support )
Email Support

Most of our customer contact people can be emailed by using their first name then For example;
See the contacts page for a list of names
Email links are not provided here otherwise they might be used by spammers.

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Phone Support ( Phone Support )
Phone Support

We have always provided applications & technical support free of charge for the life of our equipment, during business hours. During holidays our answering machine may provide cell phone numbers for emergency contacts.

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Onsite Support ( Onsite Support )
Onsite Support

We support our equipment in the field when needed. This is usually chargeable. Call to discuss your problem first. Most problems can be resolved over the phone. Startup assistance is available but it must be arranged well in advance of date.

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Returns ( Returns )

Call to discuss your problem first. Most problems can be resolved over the phone. If the unit has to be sent back to us, use the RA form provided here. Click here for a printable RA form.

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