SLX 160 Overview:

The SLX 160 Submersible Level Transducer is typically used to monitor the level of sewage wet wells, chemical tanks, streams, clearwells, ground storage tanks or other applications with low-to-moderate suspended solids.

The SLX 160 has a 2.0" diameter ABS/PVC housing and 0.9" ceramic diaphragm.  The housing is suited for use in chemically aggressive applications.  The plastic housing also provides excellent electrical isolation from surges which are typically encountered due to lightning. 

SLX 160 is available in either of two outputs: 1) The SLX 160-M provides an industry standard, loop-powered 4-20 mADC output 2) the SLX 160-E is a three wire transducer with 5 VDC excitation and a 0.5-4.5 VDC ratiometric output (nominal).  

The SLX 160-M is a two-wire loop-powered device that provides a 4-20 mADC output.  The SLX 160-E and SLX 160-M are available in standard ranges of 0-1, 3, 5, 7, 10, 15 and 30 PSI.  The SLX 160-M can be factory calibrated to the customer specified span (e.g. 4-20 mADC over 0-18' excursion).  

The SLX 160-M has a 12 VDC lift-off voltage (nominal) and operates on a supply voltage of up to 30VDC.  

The SLX 160 ’s sensor has a 1.0% typical accuracy.  The SLX 160 is pendent mounted (i.e. suspended) via its Kevlar®-strengthened signal cable.  Thus, the SLX 160 is appropriate for applications with low to moderate turbulence.  [Applications with high turbulence may benefit from the SLX 130’s ability to be pipe mounted.]

Sensing Ranges:

1 PSI (2.31 foot maximum excursion)
3 PSI (6.93 foot maximum excursion)
5 PSI (11.5 foot maximum excursion)
7 PSI (16.2 foot maximum excursion)
10.0 PSI (23.1 foot maximum excursion)
15.0 PSI (34.6 foot maximum excursion)
30 PSI (34.7 foot maximum excursion)

Types of Signal Cable: 

  • The SLX 160-M is available with either a TPE (Thermoplastic elastomer) or Teflon(R) jacketed cable. Further, the TPE jacketed cable is available in two variations [i.e. with/without Ropellant(TM)  (i.e. rodent repellent) additive]. 
  • The SLX 160-E is available, exclusively, with the Teflon(R) jacketed cable.

Engineering Specification - SLX 160 Submersible Transducer: 

A 2-wire, 4-20 mADC, 10-36 VDC, loop-powered submersible level transmitter shall be provided to sense the liquid level of the _____________ at the location as shown on the plan drawings.  The submersible level transmitter shall be pendant mounted using the manufacturer’s supplied mounting hardware and in accordance with the manufacturer’s mounting instructions. 

To provide enhanced chemical resistance and electrical isolation the transducer’s housing shall be made of plastic (PVC/ABS/Nylon) and contain a 0.9” diameter, gold-flashed, ceramic diaphragm.  Stainless steel bodied transducers do not provide such electrical isolation.  Further, stainless steel diaphragms may be deformed or damaged by point-pressures.  Such deformation produces a nonlinear output.  Transducers with stainless steel bodies and/or stainless steel diaphragms are specifically precluded by the specification.  To provide enhanced electrical and surge protection the transducer shall contain, as a minimum, three levels of transient protection.  To enhance ease of installation and reduce complexity the transducer’s electrical connections shall be polarity insensitive.

The transducer’s internal air pressure shall be relieved to atmospheric pressure through a vent tube which is an integral part of the signal cable.  To ensure long-term signal-stability and sensor-security the transducer’s breather tube shall be protected from atmospheric hazards by a sealed breather system or hydrophobic filter.  Transducers which do not terminate the breather tube at a sealed breather or hydrophobic vent are of inferior design and prone to clogging.  Further, transducers which rely on the signal cable’s ‘packing’ for equalization of pressure (i.e. transducers without a dedicated breather tube) are also of an inferior design.  Transducers of inferior design are excluded by the specification. 

To enhance the signal cable’s strength and resilience the signal cable shall include a aramid strengthening member.  To enhance the transducer’s stability in the submerged environment the transducer shall be internally weighted.  Transducers which provide similar stability by means of external weights also provide surfaces which accumulate debris thus making periodic maintenance (i.e. debris removal) a time consumptive process.  Transducers with external weights are excluded by the specification.   

The transducer shall be available in fixed pressure ranges of 1, 3, 5, 7, 10, 15 or 30 PSI or can be factory-calibrated to the customer’s specified span/range.  The sensor’s signal cable shall be of a length as specified by the customer and shall be jacketed and with { Teflon (Option ‘T’) … or … TPE (Option ‘W’) … or … TPE with Ropellant™ Additive (Option ‘R’) [ < Choose one]}.  The transducer shall be a CONTEGRA Model SLX 160-M.


          SLX 160 Sales Literature: 10475-0001-15 SLX 160 Sales Literature     

          SLX 160 Installation:     10476-0001-02 SLX 160 Install

          Ropellant(tm) announcement:     Ropellant

          Small Signal Wiring Practices:     10417-0001-02 Wiring

          SLX Cable Hanger:     10179-0002-06 CH-SLX1c