FAQ

Level Switches - General

Are Babbitt Level switches approved for a classified area?

All Babbitt Level switches are approved for Class I, Groups C & D Div. I & II; Class II, Groups E, F & G Div. I & II.

Are Babbitt Level switch housings NEMA 4 rated?

Yes, all Babbitt Level switches are NEMA 4 – General purpose. For NEMA 4X, an additional O-Ring is required which can be added at the factory upon request.

What is the highest temperature Babbitt Level switches are designed to handle?

Standard Babbitt Level Switches can handle temperatures ranging from 180F to 450F depending upon the model and insulator material. Optional Teflon insulators can be added for temperatures up to 450F. An optional Peek insulator will allow for temperatures up to 550F. For dry applications, a custom ceramic insulator will allow for operations in temperatures as high as 1200 F. In liquid applications, 575 F is highest allowable temperature.

Are Babbitt Level switches an appropriate crossover for vibrating tuning forks?

Absolutely. Vibrating tuning fork switches have a fork shape sensing element which vibrates. As material comes into contact with the forks this vibration begins to dampen. The dampening of the signal is sensed by the circuitry and gives the desired output. Babbitt Level switches use a radio frequency signal which sends a sign wave down the probe. Any material that comes into contact with the probe decreases the amplitude of the signal. The circuity senses the change in signal and gives the desired output. While the technology between the two are different, the end result is the same – product is sensed and an output is given. However, unlike vibrating tuning forks, Babbitt Radio Frequency Level switches are not as susceptible to product buildup making them better suited for certain applications. (Learn more about our LS7000 Full-Featured Level Sensor.)

Are Babbitt Level switches an appropriate crossover for rotating paddle switches?

Absolutely. Rotating paddle switches have a paddle which rotates. As material comes into contact with the rotating paddle, the rotation stops and the circuitry gives the desired output. Babbitt Level switches use a radio frequency signal which sends a sign wave down the probe. Any material that comes into contact with the probe decreases the amplitude of the signal. The circuity senses the change in signal and gives the desired output. While the technology between the two are different, the end result is the same – product is sensed and an output is given. However, unlike rotating paddle switches, Babbitt Level switches have no moving parts. There are no motors to burn up, paddles to fall off or bearings to wear out. Also, Babbitt Radio Frequency Level switches are not as susceptible to product buildup which makes them better suited for dry bulk solid applications. (Learn more about our Dry Bulk Solids applications.)

Are Babbitt Level switches an appropriate crossover for part numbers L2000, L3520, L3521, L3522, L3540 or L3541?

Absolutely, Babbitt Level switches are very similar with only slight differences in specifications. However, to help determine which Babbitt Level switch is right for your application, we will need more information about your particular application. Please contact us via the contact us or request a quote submission form.

Are Babbitt continuous level transmitters an appropriate crossover for part numbers L2610, L2631, L3610 or L4610?

In most cases, yes, however there are variances in products and specifications. In order to determine which Babbitt transmitter is best suited, we will need more information about your application. Please contact us via the contact us or request a quote submission form.

Level Switches – Probes & Coatings

How are your probe lengths measured?

Probes are measured from the end of the process connection to the tip of the probe.

How long and short do you make your probes?

Rigid probes are available in lengths up to 12 feet and cable probes in lengths up to 100 feet. Depending upon the application, probes as short as 1 inch to completely flush are available.

If I purchased a probe too long do I need to order a shorter one? How about if I ordered a probe too short and I need a longer probe?

Stainless steel probes that are too long can simply be cut with a hack saw. If the stainless steel probe is to short, it can be lengthened by welding an additional rod. HALAR probes can NOT BE field modified.

Can I use a stainless steel probe to ignore FOAM in a water based application?

No, you will need a HALAR coated probe in water based foam applications because stainless steel will detect the water in the foam as product. Although, a stainless steel probe can be used for oil based foam applications.

What is HALAR?

HALAR is a fluoropolymer coating with similar chemical resistance characteristics to Teflon.

What’s the difference between HALAR and Teflon?

HALAR’s chemical characteristics allow for a thicker coating to be applied to the probe. HALAR also tends to be less expensive than Teflon. Teflon, on the other hand, has superior release properties and may be better suited in certain food applications.

Why would I need a HALAR coated probe in my application?

A HALAR coated probe would be needed for single point RF switch applications where a conductive buildup is expected, providing isolation from ground. A HALAR coated probe is needed for dual point RF operations within a conductive media (water), where isolation from ground is REQUIRED for proper dual point operation.

Why would I need a Teflon coated probe in my application?

There are a few applications where Teflon has demonstrated better chemical resistance and release properties than HALAR. TEFLON is also better suited for certain food applications.

How thick is the HALAR coating?

5-10 mils.

Is the HALAR coating tested for flaws? If so, how?

Yes, we do an electric spark test. The coated probe is placed in a tank of water tip end first, leaving the uncoated portion of the probe out of the water. A voltage is applied to the uncoated portion. If there is a flaw in the coating, the voltage will pass into the water.

Ultrasonic and Radar

Can the Ultrasonic see through foam?

No. Sound waves unlike the microwave pulse of a radar tend to be absorbed by foam. In the case of foam, Radar is the better choice.

Can the Radar unit see through foam?

Yes, the radar unit can see through both foam and vapor.

Do you have an explosion proof Ultrasonic?

No, but an explosion proof radar would be an alternative solution. Explosion proof radars are available in either 24VDC or 2 Wire loop power.

Do you offer a high temperature or high pressure ultrasonic?

Yes, we do offer options for higher temperature/pressure ratings on our ultrasonics. Standard ultrasonics are rated to 140F and 15PSI. The high pressure ultrasonic is rated to 5 Bars (72 PSI) and the high temperature ultrasonic will work in applications up to 260F.

Do you offer a sanitary Ultrasonic?

Yes, we offer two different model ultrasonics for sanitary applications. The standard sanitary ultrasonic will work in normal operations, but will need to be removed during cleaning. The other sanitary model will allow for high temperature/pressure and therefore does not have to be removed during cleaning. Both models will work in tanks up to 30 feet and are available in 1 ½” or 2” Tri-Clamp connections.

Do you offer a high pressure Radar?

Yes, we do offer options for higher pressure ratings on our Radars. Standard Radars have a Polypropylene Antenna and are rated to 190F and 150PSI. The high pressure Radar has a Teflon Antenna and is rated to 70 Bars (1,000 PSI) and will work in applications up to 140F.

Do you offer a high temperature Radar?

Yes, we do offer options for higher temperature ratings on our Radars. Standard Radars have a Polypropylene Antenna and are rated to 190F and 150PSI. The high temperature Radar has a Teflon Antenna and Teflon De-Coupler and will work in applications up to 350F and is rated to 5 Bars (72 PSI).

Can the Radar be high temp AND high pressure?

No, the high pressure Radar is not high temperature because its mounting threads are made of Aluminum. For high temperature, we would have to use TEFLON threads, but TEFLON threads will not take 100psi of pressure.

Do you have an Ultrasonic or Radar with HART communication?

Yes, both the Ultrasonic and Radar 2 Wire units come with HART communication.

How far from the tank wall does the Ultrasonic or Radar need to be mounted?

Two feet is a good general rule of thumb. To be specific, half the radius of the tank or 0.1 x tank height.

Can an Ultrasonic or Radar be mounted in the center of a dome capped tank?

Yes, but a stilling well which goes to the bottom of the tank will be required. The ultrasonic can have either a plastic or metal pipe, but the radar must have a metal pipe.

Dual Point RF Switches (LS7000/2 & LS8000/2)

How short can the measuring range be on a dual point RF switch?

2 inches

Would a 7000/2 work well in a plastic pellet application?

No, we generally do not recommend 7000/2 units in dry applications due to the low conductivity. Two separate 7000 units would be a better solution.

What liquids do the dual point switches work best in?

They are designed to work in Homogeneous Liquids, such as Water, Acids and Solvents. Liquids that change in conductivity or applications where various materials may be in the vessel at different times are undesirable applications. If this is the case, please use two probes.

Can I use a dual point switch in an application that will possibly leave a buildup on the probe?

Unfortunately, No. Material sticking on the probe will affect set point repeatability. If this will be a problem, we strongly recommend using 2 separate LS7000 units instead of the LS 7000/2.

LT 9000

Will the LT9000 work in a NON-conductive application?

No. When we boost the LT9000 signal enough to work in non-conductive applications it becomes unstable so we suggest limiting it to conductive media.

Does the probe on an LT9000 need to be HALAR coated?

Yes, because the LT9000 is limited to electrically conductive applications a coating is required in order to electrically isolate the probe from ground.

LTM Transmitters

What is the difference between the LT-1 transmitter and the LTM 250/350 transmitters?

The LT-1 is an analog transmitter with no digital display. The LT-1 provides step up level through a series of reed micro switches and is available in ¼” or ½” increments. LT-1 transmitters are a better option when price is a concern or for applications that have vibration. LTM 250/350 transmitters are loop powered and provide continuous level transmission. The LTM’s are extremely accurate and provide precise level indication. LTM transmitters have different approvals (CSA/ATEX) and have options for different communication options such as HART or Field Bus.

What are the Approval Ratings for the LTM’s?

CSA-USA Exp. (Explosion-Proof); Class I, Div. 1, Grp. B, C, D, E, F, G

Is the LTM Intrinsically safe?

No, the LTM’s are not intrinsically safe.

Can a standalone LTM be mounted with a flange?

Yes

What is the maximum temperature and pressure on a direct insertion unit?

The maximum temperature is 300 F. The highest float pressure is 1600 PSI.

Is the remote mounted head available on the LTM250 and LTM350?

Yes, the remote mounted head option is available on both.

Can the zero and span be adjusted remotely?

No, the zero and span will need to be adjusted from the LTM head display.

Will the float and stop ring on an LTM350 fit in a 2” coupling installed on a tank?

The float and stop ring will fit thru a 2” coupling. The OAD of the float is 1.88” and the stop ring is smaller with an OAD of 1.3”.

What is the length of the float? What is the float OD?

The float length is 2.94” and the OD is 1.88”.

Does vibration affect the magnetostrictive working principle (the strain wave travelling down the wave-guide)?

The LTM’s are vulnerable to vibration if it is medium to high intensity. The magneto wire tends to rattle inside the probe causing erratic and /or false signals. The LT-1 would be a better option.

Are all compression fittings adjustable?

Compression fittings are adjustable as long as the PSI is low. When the PSI is low (under 100 psi) plastic rings are used. When the psi is higher than 100, 316SS rings are used and once tightened down it is fixed in that spot.

Have questions about your next application? Contact us