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Strainer monitoring kit (pressure sensor) · BACnet points list
Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP) BACnet points list
Updated 12 November 2026Unofficial source
The Smart Strainer kit measures inlet and outlet pressure and temperature across a strainer screen and works out how full the basket is. On strainer models with an automatic flush ball valve it opens the valve when the pressure drop passes a set threshold. Over BACnet MS/TP it reports seven Analog Inputs, five alarm and status inputs and a flush status value.
This page lists 13 BACnet objects for the Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP) — 1 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from a copy of Watts’s documentation hosted by BACnet International catalog, not by Watts itself, so treat it as unofficial.
- Manufacturer
- Watts
- Model
- Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP)
- Equipment
- Strainer monitoring kit (pressure sensor)
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 13 (1 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.2.1 (application J1331)
- Also known as
- 118501, Watts Smart Strainer, Smart Strainer kit
- Source document
- BACnet Protocol Implementation Conformance Statement - Smart Strainer 118501 · rev. August 24, 2026 (unofficial copy, hosted by BACnet International catalog)
Reference only, provided as-is: verify against Watts’s current documentation and the live device before use. Not official Watts information. Terms of use.
BMS integration notes: Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP)
Poll the inlet and outlet pressures and the basket fill level, and map the three level alarms and the leak input to BMS alarms. The valve-open input and flush status show when the strainer is flushing.
Minimum points to map
The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.
| Object | Name | Why | Access |
|---|---|---|---|
| AI 6 | Basket Fill Level | Screen loading, % | Read |
| AI 2 | Inlet Pressure | Inlet pressure, psi | Read |
| AI 3 | Outlet Pressure | Outlet pressure, psi | Read |
| BV 0 | Flush Status | Flush state | Write |
| BI 4 | Valve Open Status | Flush valve open | Read |
| BI 3 | Alarm High Level | High basket-level alarm | Read |
| BI 0 | Leak Status | Leak alarm | Read |
Network setup
- MS/TP data rates 9600 to 115200; Max_Master 0-127 and Max_Info_Frames 1-255 are writable on the Network Port object.
- The PICS lists 10K ohm bias resistors on the MS/TP port.
Watch out for
- The PICS does not say what writing BV 0 does; test before using it as a flush command.
Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP) BACnet objects
Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AI | 0 | Sensor Type | Sensor type code, 0-65535 | no-units | Read | |
| AI | 1 | Days | Day count, 0-65535 | days | Read | |
| AImin | 2 | Inlet Pressure | Strainer inlet pressure | psi | Read | |
| AImin | 3 | Outlet Pressure | Strainer outlet pressure | psi | Read | |
| AI | 4 | Inlet Temperature | Inlet water temperature | °F | Read | |
| AI | 5 | Outlet Temperature | Outlet water temperature | °F | Read | |
| AImin | 6 | Basket Fill Level | Screen loading, 0-100 % | % | Read | |
| BImin | 0 | Leak Status | Leak detected | Read | inactive / active | |
| BI | 1 | Alarm Low Level | Low-level alarm | Read | inactive / active | |
| BI | 2 | Alarm Mid Level | Mid-level alarm | Read | inactive / active | |
| BImin | 3 | Alarm High Level | High-level alarm | Read | inactive / active | |
| BImin | 4 | Valve Open Status | Flush ball valve open | Read | inactive / active | |
| BVmin | 0 | Flush Status | Flush state; Present_Value is writable | Write | inactive / active |
No points match these filters.
Object ID lookup: Watts Smart Strainer 118501 point IDs by name
Integration notes
- Object list taken from the PICS object lists and range table; it gives no separate descriptions, so short ones are added here.
- AI and BI Present_Value is writable only when Out_Of_Service is true. BV 0 Present_Value is writable.
- Pressure and temperature ranges depend on the fitted sensor.
- Copy taken from the BACnet International product catalog; dated August 24, 2026.
Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP) and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.
Questions about the Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP)
How many BACnet points does the Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP) have?
This list has 13 BACnet objects: 7 analog inputs, 5 binary inputs, 1 binary value. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP) BACnet points are writable?
1 of the 13 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.
Where is the official Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP) BACnet documentation?
Watts does not publish it on its own website. This list comes from BACnet Protocol Implementation Conformance Statement - Smart Strainer 118501, revision August 24, 2026, a copy hosted by BACnet International catalog at https://www.bacnetinternational.net/catalog/manu/watts%20regulator%20company/PICS_118501.pdf. Ask Watts or its representative for the current revision.
What are the minimum BACnet points to integrate the Watts Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP)?
Start with AI 6 Basket Fill Level (Screen loading, %); AI 2 Inlet Pressure (Inlet pressure, psi); AI 3 Outlet Pressure (Outlet pressure, psi); BV 0 Flush Status (Flush state); BI 4 Valve Open Status (Flush valve open); BI 3 Alarm High Level (High basket-level alarm); BI 0 Leak Status (Leak alarm).
How do I check these points on the real Smart Strainer 118501 differential pressure monitoring kit (BACnet MS/TP)?
Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.
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Source: BACnet Protocol Implementation Conformance Statement - Smart Strainer 118501 · rev. August 24, 2026. Object names, instances and units are reproduced as published; descriptions are our own.