Pet-Immune PIR Detectors: Mounting, Animal Size and False-Alarm Limitations

Pet-immune PIR detectors reduce unwanted alarms from animals only within the conditions specified for the exact model. An animal weight rating is not a promise that every smaller animal will be ignored in every room. Mounting height, lens pattern, furniture and climbing routes all affect the result. For NZ installers, the right starting point is a room survey and the current detector instructions, followed by a documented test of both animal tolerance and human detection.

Treat pet immunity as a conditional feature

A PIR responds to changes in infrared energy across its detection zones. Pet-tolerant designs use optics and processing to distinguish some expected animal movement from a person moving through the protected space. That process has limits, especially when an animal is close to the detector or climbs into areas intended for human detection.

Manufacturer ranges include different PIR, dual-technology and wireless options. Do not apply a weight figure, mounting height or jumper setting from one model to another. RISCO's DigiSense page lists separate PIR Pet and DT Pet models with their own installation documents. Obtain the matching document and hardware revision before choosing a setting.

Survey animals and the room together

Ask about the number, size and behaviour of animals present while the alarm is armed. Include visiting animals, a growing puppy and an animal that jumps onto shelving. Record where the animal sleeps, how it reaches food or water and which doors remain open. A test conducted while the animal is held on the floor does not represent an unsupervised room.

Mark sofas, benches, stairs, cat trees, windowsills and storage stacks on the survey. Check whether rearranged furniture could create a new climbing route. In a commercial reception or caretaker's area, deliveries and cleaning equipment may alter that route regularly. Explain that the installation conditions form part of the agreed protection arrangement and need review when the room changes.

Follow exact mounting and lens instructions

Use the manufacturer's specified mounting height and orientation for the chosen model and pet setting. Do not lower, tilt or swivel the detector merely to make its view look convenient. Those changes can shift zones onto furniture or remove intended human coverage. Where brackets are supported, check whether their use is restricted for pet immunity.

Secure the mounting surface so vibration cannot change the view. Seal cable entries as instructed and keep the lens clean without using an unapproved coating or solvent. Confirm that any lens mask is the specified component installed in the documented position. Tape or improvised masking can create untested blind spots and should not become a substitute for a suitable detector location.

Avoid pointing the detector into environmental conditions excluded by its manual. Sunlight, heat sources, moving curtains and draughts can complicate performance. A dual-technology label does not remove the need for a proper survey. Microwave settings and room boundaries also need model-specific attention; do not assume every technology combination behaves the same way.

RISCO pet-detector mounting and rating examples

The following figures show why a pet rating must be checked against the exact model and revision. RISCO's published DigiSense specifications distinguish PIR Pet from DT Pet; its iWAVE instructions also specify an animal-height limit and sensitivity setting. These are reference examples, not interchangeable installation instructions.

Sources: RISCO DigiSense specifications by model and RISCO iWAVE RWX95PA/PABL installation instructions 5IN2978-F (PDF), checked 25 October 2026. Where a supplied unit's matching manual differs, follow that manual and resolve the discrepancy with technical support before commissioning.

For example, a dog below the weight limit can still fall outside the iWAVE document's stated conditions if it exceeds the height limit. A cat on a bench also changes its position in the detection pattern. Measure mounting height from the finished floor, record the animal's size and reachable furniture, and test human detection after selecting the supported pet setting.

Understand why weight alone is misleading

Compare two illustrative rooms containing the same dog. In the first, the dog stays on a clear floor with no furniture near the detector. In the second, it climbs onto a bench beneath the lens. The dog's weight has not changed, but its position within the detection pattern has. That is why a catalogue number cannot replace assessment of the protected volume.

Multiple animals can present another challenge. Do not add their weights and assume the sum is covered, or assume the published figure applies independently to each animal. Ask the manufacturer how its stated rating is defined. If the behaviour falls outside the supported conditions, revise the layout or protection method instead of promising an outcome that has not been established.

Select the protection method for the occupied scenario

Perimeter contacts or separately designed detection can help protect selected openings while an animal occupies an internal area. They do not automatically provide the same coverage as volumetric detection. Explain the remaining gaps and agree the armed configuration with the client. Avoid simply omitting a vulnerable room without making the consequence clear.

Commission human detection as well as animal tolerance

Follow the manual's warm-up and walk-test procedure. Test the intended human routes across the protected area, including approaches near furniture and doorways. Confirm the alarm panel receives the correct zone event and tamper indication. For wireless devices, check the radio path and any sleep or rearm behaviour that affects the test sequence.

Observe representative animal movement under the agreed conditions without putting the animal or technician at risk. Repeat checks with the room arranged as it will be used. A short successful demonstration is useful evidence, but cannot guarantee every future movement or environmental condition. Record what was tested, what was not tested and any restrictions the client must maintain.

Keep the monitoring provider informed during authorised tests and restore normal service afterwards. Check that temporary bypasses and walk-test modes have been removed. Explain how to report a repeated unwanted alarm, which zone name to quote and what recent room or animal changes to record. That information is more useful than repeatedly increasing pulse count without investigating the cause.

Hand over limitations and a practical review plan

Give the client the detector model, relevant settings and a clear explanation of the supported animal conditions. Ask them to seek a review after acquiring another pet, moving shelving, changing the detector position or altering room access. Include the model instructions in the service record so another technician does not apply a different product's limits.

For recurring alarms, compare event times with heating, sunlight, animal movement, cleaning activity and other zone faults. Inspect wiring, power and tamper conditions as well as the detector view. Make one evidence-based adjustment at a time and retest human detection. The goal is reliable agreed coverage with understood limitations, rather than an unsupported guarantee that an alarm will never occur.

Equipment selection and technical references

Use these detector options as a starting point for a project specification. The pictured items are equipment candidates, not a pre-approved complete design. Confirm model, accessories, interface support and suitability before ordering.

Related installer guidance: PIR vs Dual-Technology Detectors for Commercial Sites.

Primary references checked 24 October 2026: RISCO DigiSense model specifications and installation documents; Bosch guidance on pet-immune detector limitations.

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