the cold room at night
the compressor that stops before dawn and the product nobody sees until the morning shift
AstreaIoT · sensors that alert you on WhatsApp when something on your site goes out of range
For distributors of meat, dairy and refrigerated groceries · NOM-251
the cold room at night, the open door and the log the chain asks for:
your product watched from the warehouse to the customer’s dock.
A night with the compressor stopped or a freezer door left ajar shows up in the morning, when the product is already out of range. And when the chain or the supermarket receives, it asks for the temperature log: without it, it is your driver’s word against the receiver’s. AstreaIoT watches every cold room and freezer in the warehouse, alerts on WhatsApp whoever can act and builds the log by itself.
meat cold room2.1°Cfreezer room−18.6°Ccompressor12.7Adoorclosedsample readings, as your team sees them
the open door
a freezer door left ajar at night, and the temperature rising with nobody watching
the log at the dock
the receiving chain asks for the temperature record; without it, you lose the argument
from the warehouse to the truck, one platform.
The warehouse’s cold rooms and freezers come in from the first site. The truck’s box and the route with temperature are delivered per project, on the same platform and with the same log.
cold rooms and freezers
from day one2.1 °C · meat cold roomthe temperature now · example
−18.6 °C · freezer roomthe temperature now · example
12.7 A · compressorthe current now · example
the month's kWh per room, from the panel · example
- freezer3,020 kWh
- meat2,140 kWh
- dairy1,380 kWh
In every cold room and freezer of the warehouse: a temperature sensor, a door-opening sensor and a current meter on the compressor. If a compressor works too hard, you see it weeks before it fails.
the door left open
from day oneopen 17 min · 02:14the freezer door, at night · example
An opening sensor on every door: if it stays open more than 5 minutes the alert comes, and at 15 it steps up, with the temperature already climbing.
the log your customer asks for
from day one168 rows · 0 without a readingthe week's record, meat cold room · example
The temperature record: one PDF per room with one row per hour, to hand to the chain or the supermarket when they ask.
the truck, per project
per projectA cellular sensor in the refrigerated box with temperature, door and location, or a mobile gateway for several zones of the box. Delivered per project: it needs a SIM and coverage on your route.
point by point
four places your product goes through.
From the cold room to the customer’s dock: in each place, what is watched and who gets the alert.
example distribution center · the truck’s box comes per project
hover a row · click to pin it · esc to let go
what goes on each piece of equipment
each sensor goes on equipment you already have.
Five points in a distribution warehouse and where the sensor goes on each. All of them go on the outside: no equipment is replaced.
- coldcold room
measures: the temperature inside the room, and every time the door opens.
installed: the probe on the wall, away from the evaporator; the contact on the door frame.
- doordock door
measures: when the roll-up door opens and closes, with its time.
installed: at floor level, next to the track, with no wiring.
- powerelectrical panel
measures: the current of each compressor: if one stops, you see it before the temperature.
installed: clamped around the cables, without cutting them.
- coldfreezer room
measures: the frozen goods' temperature, at −18 °C, and every time the door opens.
installed: the probe on the wall, away from the evaporator; the contact on the door frame.
- networkgateway
measures: it does not measure; it gathers the warehouse’s readings and sends them to the dashboard.
installed: on a mast, with the antenna clear above the roof.
One night at the warehouse, with sample data
what happens, and what you get.
- 10 days before
The platform sees the compressor working too hard.
The meat cold room's compressor has drawn more than 15 % over its baseline for two weeks. A recommendation is left in the dashboard: schedule the maintenance, while the room is still in range.
recommendation · openCompressor · meat cold roomCEDIS Nortelikely cause
It has drawn more than 15 % over normal (11.2 A) for 2 weeks: usually low refrigerant, a dirty condenser or a worn compressor.
what to do
Schedule the compressor maintenance: the refrigerant, the condenser cleaning and the wear, before it fails.
Oct 18 · the room is still in range
The recommendation in the dashboard, as the platform leaves it. Example. - 01:20
The compressor cannot keep up: its current shoots up.
The blocked condenser makes it work too hard. At 01:30 it passes 15 A, 125 % of its nameplate, and the room starts to climb from 2.2 °C.
WhatsApp alert 01:35 · condenser cleaned 02:25currentout of rangenormal, up to 15 AMinimum11.7 Amié 28 · 02:40Maximum15.6 Aoutmié 28 · 01:35Out of range55 min1 excursion · mié 28Ver como tabla
Current of the meat cold room's compressor from 23:00 to 05:00: steady at 12.7 A until 01:20, it climbs to 15.6 A and is over the 15 A limit from 01:30; at 02:25 it drops to 11.8 A and stays there. Sample data. Day Minimum Maximum Out of range mar 27 oct 12.6 A 12.7 A — mié 28 oct 11.7 A 15.6 A 55 min The compressor's current from 23:00 to 05:00, and the limit that triggers the alert. Example. - 01:35
The alert reaches the maintenance lead's WhatsApp.
With the warehouse closed. It says which unit, what is happening and what to check first, and it is answered from the same chat. If nobody answers, it moves up to the next person in the chain.
The message the platform sends, with sample data (in Spanish). - 02:10
They arrive, clean the condenser and the current drops.
The app keeps what was done and who did it. At 02:25 the compressor is back at 11.8 A, and the room, which reached 3.8 °C, goes back to 2 °C without leaving its range.
overload
Compressor · meat cold room
Refrigeration · CEDIS Norte
Criticalcurrent · 01:3515.6Anameplate 12 AdiagnosisIt has drawn more than 15 % over normal for 2 weeks: usually low refrigerant, a dirty condenser or a worn compressor.
› The product first: do not open the room. Check the condenser and the refrigerant; if the current does not drop, call the technician.
what was done02:10Acknowledged · maintenance lead
02:25Condenser cleaned; the compressor at 11.8 A
The alert in the app of whoever handled it. - in the morning
The chain says the meat arrived warm. The record answers.
The room's hour-by-hour record, as you send it to your customer. Sample data.
the same night, two records
what the log sheet sees against what the sensor sees.
The room's log sheet is filled in three times a day. On October 27 the three readings were fine, and from 01:20 to 03:30 the meat cold room climbed to 3.8 °C with the compressor overloaded. The sheet does not see it; the sensor does, and the current alerted first.
temperatureout of rangeallowed, 0 to 4 °C
Minimum2.0 °Cmar 27 · 08:00
Maximum3.8 °Cmié 28 · 02:25
Out of range0 min0 excursions
Ver como tabla
| Day | Minimum | Maximum | Out of range |
|---|---|---|---|
| mar 27 oct | 2.0 °C | 3.0 °C | — |
| mié 28 oct | 2.0 °C | 3.8 °C | — |
meat cold room · October 27 to 28 · sample data
| the hand log sheet | the sensor | |
|---|---|---|
| Readings in the day | Three, by hand, at 8:00, 14:00 and 20:00. | All day and all night, with nobody taking them. |
| The climb in the early hours | Not there: nobody writes at that hour. | From 2.2 to 3.8 °C between 01:20 and 02:25, without leaving 0 to 4 °C. |
| The compressor | Nobody knows it is working too hard. | At 01:35, 15.6 A against a 12 A nameplate: the alert, before the room left its range. |
| When the customer complains | Your word against theirs. | The room's hourly record, with the temperature the load left at. |
| A missing reading | The gap stays, and the finding is yours. | The record counts the hours without a reading for each unit. |
what you see before the load is lost.
four cases, each with its reading.
What we see in a warehouse, with the reading that gives it away before it costs. Sample data.
The power goes or the compressor stops in the early hours.
The room starts to climb with the door shut and the compressor drawing no current: the alert comes when it passes 4 °C, with the likely cause, a power cut or a stopped compressor.
points 1 and 3 · cold room and panelThe freezer door is left ajar after loading.
The contact marks the door open: the alert comes at 5 minutes and steps up at 15, with the temperature already climbing. It says which door and since when.
point 4 · freezer roomA compressor works too hard and nobody notices.
The current meter learns the compressor's baseline: if it runs more than 15 % over for weeks, a recommendation is left to schedule the maintenance before it fails.
point 3 · panelThe chain asks for the log at receiving, or the audit arrives.
The temperature record of the room the load left from: one PDF per unit, one row per hour, no gaps at night, ready in minutes.
point 1 · cold roomper warehouse, in four steps.
site survey
1 dayTechnical visit: inventory of cold rooms, freezers, doors and panels, and what each customer asks for at receiving.
physical installation
2–7 days per siteSensors in every cold room and freezer, a current meter on each compressor and a gateway that stores readings while there is no connection, without stopping operations.
rules and alerts
by roleRanges per room, a day rule and a night rule for the doors, and who gets each alert on WhatsApp.
the truck
per projectWhen you want the route with temperature: sized per unit, with the SIM and coverage of your routes.
To start, you tell us which cold rooms and freezers we watch, what each customer asks for at receiving and who gets the alert, in what order. The gateway needs a power outlet and cell signal.
The norm and calibration. NOM-251-SSA1-2009 asks for cold chain temperature records: readings every few minutes per room, timestamped with a change log, and the period report as a PDF. Each sensor comes with its factory calibration report; it is not a certificate from a lab accredited by the ema. For the audit, your calibrated thermometer is still the reference.
who we are.
AstreaIoT is the monitoring platform of Astrea Technologies, an engineering and software company in Monterrey since 2018. The sensor network is ours, we build the platform and the app, and the hardware comes from manufacturers we work with directly. We install in northern Mexico with our own team and in the rest of the country with partner integrators.
Hardware from Milesight, Dragino and Tektelic; stock in Mexico through Syscom.
common questions before the quote.
Are the truck’s GPS and temperature included?
Not in today’s box: the truck’s box and the route with temperature are delivered per project. It is sized per unit, with a cellular sensor in the box or a mobile gateway, and needs a SIM and coverage on your routes.
Can it connect to old cold rooms and freezers?
Yes. The sensors are external and mount on any equipment, without touching the refrigeration system and without stopping operations.
What happens if the warehouse loses internet?
The gateway stores the readings while there is no connection and uploads them when it comes back. The sensors keep recording and everything syncs on reconnect.
How are the sensors calibrated, and how often?
Each sensor ships with its factory calibration report. It is not a certificate from a lab accredited by ema: for the inspection, your calibrated thermometer remains the reference, and the platform keeps each device’s certificate in its calibration record. Recalibration every 12 months: we keep the calendar.
What if I also run warehouses for third parties?
The refrigerated warehouses and 3PL page covers third-party rooms and the report for each brand. It is the same platform.
the warehouse’s next night is already watched.
Thirty minutes. You tell us how many cold rooms and freezers you have, how many units go out on routes and what each customer asks for at receiving. We hand you a quote per warehouse and what goes per project.