Omron PS-5S Electrode Holder — Selection Guide & Specs

By Abdullah Zahid
13 min read
Omron PS-5S 5-pole electrode holder for conductive water level control in building tank systems

Omron PS-5S Electrode Holder — Specs, Compatibility, Variants & Selection Guide

When you are specifying level control hardware for a building water supply or drainage system and need five distinct electrode points in a single holder, the Omron PS-5S is the part engineers reach for. As a 5-pole electrode holder from the PS-@S(R)/-31 family, the PS-5S provides the mechanical and electrical interface between up to five electrode rods in a tank and an Omron 61F floatless level controller — giving you high, low, alarm, and common points in one compact, resin-bodied assembly. This is a bottom-of-funnel decision: if you have already confirmed that conductive level sensing is suitable for your application and you need five poles, this page gives you everything to complete the specification and order with confidence.

If you have already confirmed this is the correct part, check current pricing and availability for the Omron PS-5S at LeadTime.ca — ships worldwide.

Who Should Buy the Omron PS-5S — and Who Shouldn't

The PS-5S is the right electrode holder when all of the following are true for your application:

  • You require five electrode poles to support multi-point level logic — high, low, alarm, pump stop, and common — in a single holder.
  • Your level controller is from the Omron 61F floatless level controller family and your wiring scheme calls for the standard (non-2-wire) connection type.
  • The process liquid is clean tap water or purified water — conductive, non-corrosive, and free of heavy contamination.
  • Your installation has adequate mechanical space and mounting access for the PS-5S form factor.
  • You are sourcing compatible electrode rods and cables separately and need a holder that allows easy electrode withdrawal for inspection.

If you need fewer than five level points, the PS-3S, PS-3SR, PS-4S, or PS-4SR variants are the correct choice. If your controller or wiring scheme requires a 2-wire type holder, specify the PS-5SR instead. For very tight installation spaces, the PS-31 compact electrode holder may be the better fit.

On this page:

What the Omron PS-5S Does in a Level Control System

The Omron PS-5S is not an electronic transmitter or a standalone sensor — it is a mechanical and electrical holder that positions multiple conductive electrode rods in a tank at precisely the depths that correspond to your desired level setpoints. Made from resin (PBT), the PS-5S accepts five electrodes and provides the termination points that connect those rods through cables to an Omron 61F floatless level controller. The controller completes the circuit when conductive liquid bridges an electrode to the common electrode, detecting whether the liquid level is above or below each set point.

The PS-5S is part of the PS-@S(R)/-31 electrode holder family, which Omron describes explicitly as separate electrode holders for water supply and drainage control in buildings. The PS-@S(R) models are available in 3-, 4-, and 5-pole configurations to match the number of level points required in a given application — the PS-5S is the highest-pole-count standard variant in this family. Omron documentation also highlights that the PS-@S(R) holders allow electrodes to be withdrawn easily for inspection, a practical advantage for maintenance teams working on pump panels with limited access.

What distinguishes the PS-5S from a full level transmitter is its simplicity: there are no electronics inside the holder itself, no calibration, and no signal conditioning. The intelligence lives in the 61F controller. The holder's job is purely mechanical and electrical — reliable mounting, secure termination, and clean electrode separation.

Typical System Architecture

The PS-5S sits at the physical interface between the tank environment and the control panel, bridging the electrode rods in the liquid to the level controller inputs. A typical installation chain looks like this:

  • Power supply and Omron 61F floatless level controller mounted in the control panel, providing control outputs to pump starters or contactors.
  • Multi-conductor cable routed from the panel to the tank entry point, terminated at the PS-5S holder.
  • Omron PS-5S mounted at the tank top or panel access point, holding five electrode rods at staggered lengths corresponding to the desired level setpoints.
  • Five electrode rods suspended into the tank at positions for common, low level, pump-stop, high level, and high-high alarm (or equivalent logic sequence).
  • Pump starter or alarm relay downstream of the 61F, switching based on which electrodes are wet or dry.

Typical Applications for the Omron PS-5S Electrode Holder

Building water supply control is the most common application for the PS-5S. In header tanks and rooftop reservoirs serving multi-storey buildings, multi-point level detection is needed to start fill pumps at a low level, stop them at high level, and trigger alarms at extreme high and low conditions — exactly the scenario where all five poles are used.

Drainage and sump pump control for clean water or lightly contaminated water is a second strong use case. A 5-pole holder allows independent setpoints for pump-on, pump-off, and high-water alarm, which is typical in building drainage and stormwater management.

OEM panel builders and systems integrators specifying packaged pump control panels or water treatment skids often standardise on the PS-5S and Omron 61F as a proven, field-supported combination. Replacement of existing PS-5S holders in legacy Omron-based control panels is also a common driver — maintenance teams need a direct, like-for-like swap to avoid rewiring.

Application Typical Deployment
Building water supply Header tank or rooftop reservoir with pump-start, pump-stop, low alarm, high alarm, and common electrodes
Drainage / sump pump control Clean water sump with independent on, off, and high-water alarm setpoints using all five poles
OEM pump panel integration Built-in component in packaged panel with Omron 61F, PS-5S, and matched electrode rods as a pre-wired assembly
Water treatment / filtration (clean side) Feed tank level control in RO or filtration skid, monitoring fill and low-low alarm for pump protection
Legacy panel replacement Direct PS-5S swap in existing Omron level control installation without controller or wiring changes

Omron PS-5S Specifications and Variant Comparison

Parameter Value Notes
Brand OMRON Manufacturer datasheet
Model PS-5S 5-pole electrode holder
Product Family PS-@S(R)/-31 Electrode holders for water supply and drainage control
Number of Poles 5 For multi-point level control applications
Intended Medium Tap water and purified water Building water supply and drainage; confirm suitability for other media
Holder Material Resin (PBT) As per datasheet and distributor listings
Compatible Controller Family Omron 61F floatless level controllers Verify specific 61F model; check individual datasheets
Wiring Type Standard (non-2-wire) For 2-wire type, specify PS-5SR
Typical Environment Building water tanks, indoor installations Verify full environmental ratings in Omron datasheet
Required Accessories Electrodes, cables, fittings Ordered separately; confirm compatibility with PS-5S

Full technical specifications are available on the product page at LeadTime.ca.

Model Poles Wiring Type Best For
PS-3S 3 Standard Simple two-point level control with common
PS-3SR 3 2-wire type 2-wire controller wiring, three electrodes
PS-4S 4 Standard Three-point level control with common
PS-4SR 4 2-wire type 2-wire controller wiring, four electrodes
PS-5S 5 Standard Full multi-point level control: high, low, alarm, pump-stop, common
PS-5SR 5 2-wire type 2-wire controller scheme requiring five electrodes
PS-31 Compact variant See datasheet Tight installation spaces or special mounting requirements

If your controller or wiring diagram calls for a 2-wire type connection with five electrodes, the PS-5SR is the correct selection — confirm the right variant with the LeadTime.ca team before placing your order.

Expert Verdict: Where the PS-5S Fits and Where It Doesn't

The Omron PS-5S earns its place on any BOM where a controls engineer or panel builder needs fully compatible, five-point conductive level detection working in concert with an Omron 61F floatless level controller. It handles a clearly defined job — holding five electrodes securely, providing reliable electrical termination, and allowing easy withdrawal of those electrodes for inspection — and it does that job without introducing complexity. For building water supply and drainage systems where clean, conductive water is the medium, this is a low-risk, proven component with a straightforward selection path. Maintenance teams also benefit from the PS-5S when replacing failed holders in existing Omron installations: it is a direct, like-for-like swap that avoids any rewiring or controller changes.

The PS-5S has real limits, and they are worth stating plainly. The conductive level method itself — not the hardware — is the constraint. Highly corrosive liquids, non-conductive media, slurries, or heavily contaminated water will cause unreliable operation or premature failure regardless of the holder quality. In those scenarios, a different sensing technology is the correct answer, not a different electrode holder. Similarly, if your design requires only three or four level points, the PS-3S, PS-3SR, PS-4S, or PS-4SR are the right choices — over-specifying the number of poles adds unnecessary wiring. If your controller demands a 2-wire type scheme, the PS-5SR is the correct part; wiring the PS-5S into a 2-wire controller application is the most common ordering mistake in this family.

From a procurement standpoint, the PS-5S is a low-cost accessory relative to the 61F controller and pump hardware it supports, and it is generally available through stocked distributor channels. That said, confirming current stock and lead time before committing to a project schedule remains good practice — particularly for OEM builds where the holder, electrodes, and cables need to arrive together. Working with a specialist automation distributor means you get compatibility validation against your specific 61F model and wiring scheme, not just a part number shipped in a box. Check current availability for the Omron PS-5S at LeadTime.ca — we stock and ship Omron level control accessories worldwide.

For volume pricing, project-quantity quotes, or to confirm realistic lead times before locking in a build schedule, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Need to Know Before Ordering the PS-5S

Because community archives contain very little model-specific discussion of the PS-5S — which is typical for passive accessory components that do their job quietly and reliably — the most useful guidance comes not from forum war stories but from the selection and application patterns where ordering errors actually occur. The PS-@S(R)/-31 family is straightforward hardware, but the decisions that happen before the order is placed determine whether the installation works correctly from day one.

The single most common error pattern with this type of electrode holder family is pole-count confusion. Engineers specifying a level control system sometimes count their functional setpoints without accounting for the common electrode, or they select a holder based on the number of controller input terminals without cross-checking the physical level points required. A 5-pole holder does not mean five independently switched outputs — it means five electrode positions, one of which is typically the common. If your logic genuinely needs four independently sensed level points plus a common, the PS-5S is correct. If you only need two sensed points plus a common, you are paying for poles you will never connect, and the PS-3S is the right call.

The second pattern worth flagging is the standard versus 2-wire type distinction. The PS-5S and the PS-5SR are both 5-pole holders and look similar in a parts list, but they are not interchangeable in all controller wiring schemes. Buyers consulting a specialist distributor before ordering — rather than searching a generic parts catalogue — avoid this mistake because the question gets asked during the order process, not during commissioning. LeadTime.ca positions itself exactly here: when community guidance is sparse and the manufacturer's family table lists multiple variants, a brief conversation with a knowledgeable distributor costs nothing and prevents a return shipment.

Wiring and Installation Overview for the Omron PS-5S

The following is an overview of the key steps and requirements. Engineers requiring full wiring diagrams and step-by-step configuration procedures should refer to the Omron PS-@S(R)/-31 electrode holder documentation and the relevant Omron 61F controller instruction sheet.

  • Isolate all power to the level control circuit before handling the holder or electrodes, and follow applicable local electrical and safety codes throughout the installation.
  • Mount the PS-5S at the tank entry point with a proper mechanical seal to prevent liquid leakage around the holder body; verify orientation and clearance per the Omron installation instructions.
  • Set each of the five electrode rods to the depth corresponding to its intended level setpoint — electrode length determines switching point, so document each measurement before securing the rods.
  • Route multi-conductor cable from the PS-5S to the Omron 61F controller panel, terminate each electrode connection at the matching controller input terminal, and verify all terminations are secure and correctly identified.
  • Before re-energising, visually confirm that electrodes are properly separated with no contact between adjacent rods, that all cable entries are secured, and that the outside of the holder is dry and free from condensation paths that could cause false readings.

Wrong-Part Prevention Checklist Before Ordering the Omron PS-5S

Use this checklist verbatim before placing your order — it covers the most common ways the wrong part ends up in a build:

  1. Confirm you require a 5-pole holder (PS-5S) and not 3- or 4-pole or a 2-wire version (PS-5SR).
  2. Confirm the process liquid is compatible (clean tap or purified water, not highly corrosive or slurry).
  3. Verify mechanical connection and installation space match the PS-5S dimensions and mounting style.
  4. Check compatibility with the level controller (e.g., Omron 61F model and wiring scheme).
  5. Ensure you have or are ordering compatible electrode rods and cables separately.
  6. Verify environmental conditions (temperature, enclosure, splash exposure) are within the holder's ratings.

If any item on this list is unresolved, contact the LeadTime.ca team before ordering — we can confirm compatibility against your specific 61F model and help you identify required accessories in a single conversation.

Frequently Asked Questions

Is the PS-5S compatible with all Omron 61F controller models, or do I need to check my specific variant?

The PS-5S is designed for use with the Omron 61F floatless level controller family, but you should verify compatibility with your specific 61F model number and its associated wiring scheme before ordering. Different 61F variants have different input terminal configurations, and confirming that the PS-5S wiring type (standard, non-2-wire) matches your controller's wiring diagram is a required step in the selection process.

What is the practical difference between the PS-5S and the PS-5SR, and which should I order?

Both are 5-pole electrode holders in the same PS-@S(R) family, but they differ in wiring type: the PS-5S is the standard type and the PS-5SR is the 2-wire type. The correct choice is determined by your controller model and the wiring scheme it requires, not by the number of level points. If your 61F model and its wiring diagram specify a 2-wire type electrode holder, order the PS-5SR. If standard wiring applies, the PS-5S is correct. Ordering the wrong wiring type is the most common ordering error in this product family.

Can the PS-5S be used with liquids other than clean tap or purified water?

The PS-5S and the PS-@S(R)/-31 family are described by Omron as electrode holders for water supply and drainage control in buildings, with intended media of tap water and purified water. Using the holder in highly corrosive, non-conductive, or heavily contaminated liquids risks unreliable level detection and premature degradation of the holder material (PBT resin) and electrodes. For challenging liquid media, a different sensing technology should be evaluated rather than a different electrode holder variant.

How do I set the level setpoints using the PS-5S?

Level setpoints are determined by the physical length of each electrode rod inserted into the PS-5S holder. The controller detects a level when conductive liquid bridges that electrode to the common electrode. To set a switching point, you cut or select the corresponding electrode rod to reach the desired depth in the tank. This means electrode lengths must be calculated before installation and documented, because adjusting setpoints after installation requires withdrawing and trimming or replacing the rods. The PS-@S(R) design allows electrodes to be withdrawn easily for inspection, which also facilitates adjustments.

How often should I inspect and clean the PS-5S electrode assembly?

Inspection and cleaning frequency depends on water quality and the operating environment. In clean municipal water supply applications, annual inspection is a common practice; in environments with higher mineral content, biofilm risk, or any suspended solids, more frequent checks are warranted. Typical failure symptoms that indicate fouling include pumps failing to start or stop at the correct level, continuous alarm conditions, or erratic level readings. Electrodes showing visible scale, corrosion, or coating should be cleaned or replaced, and the holder body and exterior cable terminations should be checked for moisture and condensation paths.

Why Order the Omron PS-5S from LeadTime.ca

  • LeadTime.ca stocks and ships Omron level control accessories worldwide — no single-region restrictions.
  • Specialist distributor support means compatibility is confirmed against your specific 61F controller model before the order ships, not after.
  • Volume pricing is available for OEM panel builders and panel shops ordering the PS-5S alongside matched electrodes, cables, and 61F controllers.
  • Hard-to-find Omron accessories and legacy part numbers are actively sourced — if it is in the Omron catalogue, we can locate it.
  • Fast response on lead time inquiries allows you to make accurate project scheduling decisions before committing to a build.

At-a-Glance Summary

  • The Omron PS-5S is a 5-pole electrode holder from the PS-@S(R)/-31 family, designed for multi-point conductive level control in building water supply and drainage systems.
  • It is explicitly described by Omron as a separate electrode holder for water supply and drainage control in buildings — not a standalone sensor or transmitter.
  • Intended media: tap water and purified water; the PBT resin body is not rated for highly corrosive or heavily contaminated liquids.
  • Compatible with the Omron 61F floatless level controller family; confirm your specific 61F model and wiring scheme before ordering.
  • Wiring type is standard (non-2-wire); the PS-5SR is the 2-wire type equivalent for the same pole count.
  • The PS-@S(R) family is available in 3-, 4-, and 5-pole configurations — specify PS-5S only when five electrode positions are genuinely required.
  • Electrodes can be withdrawn easily from the PS-5S for inspection, a maintenance advantage noted in Omron documentation.
  • Required accessories — electrode rods, cables, and fittings — are ordered separately; confirm compatibility before placing a combined order.
  • Pricing is at the low-cost accessory level relative to controllers and pumps; verify current pricing and lead time on the product page or by contacting LeadTime.ca directly.

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