Warehouse sensor alerts: rules people don’t learn to ignore

Spatial Map raises in-app alerts from rules on any facility table — sensor readings included — and shows each alert on the floor plan where it happened. Good warehouse sensor alerts are rarer than good sensors. Most sites that install temperature, humidity, door and leak sensors go through the same cycle: every threshold alerts, a door opening at the dock sends ten messages, a probe with a flat battery alerts all weekend, and within a month people mute the channel. That is alert fatigue, and it is a design problem, not a people problem.

The minutes are examples. Take your own from the product’s tolerance and from what your sensors actually do — a week of readings on a map shows quickly which probes spike at every door opening. For the temperature side in full, see warehouse temperature monitoring.

1. 1
   Thresholds with a duration

   “Above 8 °C” alerts on every door opening. “Above 8 °C for 15 minutes” alerts when the cold room is really losing it.

2. 2
   A stale-sensor rule for every sensor table

   If a probe has not reported for three intervals, that is an alert in its own right. Otherwise a dead sensor looks exactly like a healthy one.

3. 3
   Count when the problem is a zone

   If ten probes in one freezer go high together, that is one freezer problem. A count rule says so once.

4. 4
   Severity that means something

   Critical: act now, product at risk. Warning: look this shift. Info: plan it. If everything is critical, nothing is.

5. 5
   A cooldown

   When a reading hovers around the limit, the alert opens and closes again and again. A “don’t reopen within” window turns that into one alert.

6. 6
   The right people

   The cold-chain lead gets temperature, maintenance gets batteries and offline gateways, security gets doors out of hours. Nobody wants all of it.

7. 7
   A message that says what to do

   Name the room, the reading and the limit: “Freezer F3 is at −12 °C (limit −18 °C)”. The person reading it should not need to open three screens.

In Spatial Map, alert rules are set on a table — for one facility or workspace-wide — under Alerts → Rules → New rule. A rule is one of four types:

• Condition — optional; none means every item in the table. Combine fields, for example a unit type and a reading.
• Severity — Info, Warning or Critical.
• Message — can include any field of the row and the item’s name; left empty, it uses the rule’s name and the item.
• Notify — roles (owners, admins, editors, viewers) or specific people. Nobody picked means everyone. They get the bell badge and a pop-up; every member can see every alert on the Alerts page.
• Don’t reopen within (minutes) — the cooldown.
• Preview — while you edit, the rule shows how many items match now and whether it would alert now, so you can tune a threshold before saving.

Rules are checked on the server every 15 seconds. An alert opens when an item breaches a rule and closes itself — “Back to normal” — when the item stops breaching it. People can Acknowledge or Resolve an alert, and Show on map opens the facility at the item, next to the rack, door or room it belongs to. More on the feature: IoT alerts on a floor plan.

The last rule is the quiet hero: instead of an alert per probe, maintenance gets one when enough batteries need changing to justify a round. The Polar Pharma demo has the tables to try rules like these on: temperature probes, excursions and cold-room door events.

Storage zones with live sensor markers

• Which rules fired most? A rule that fires daily and is always acknowledged without action needs a longer duration or a higher limit.
• Which alerts were never acknowledged? They went to the wrong people, or nobody believes them.
• Which incidents had no alert? Add the rule that would have caught them.
• Which sensors are always silent or always noisy? Fix the hardware, not the rule.

Readings and alerts sit next to each other on the map and in reports, so this review takes minutes. For where sensors go and how readings reach the map, see IoT sensor floor plan monitoring. A 7-day free trial covers up to five facilities with no card; Pro is $60 a month or $600 a year for up to four.