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Cisco Meraki

MT Frequently Asked Questions

Overview

This article is intended to provide a summary of the frequently asked questions on MT sensors.

Licensing

How does licensing work?

MT sensors require a dashboard license to operate, however, the licenses are not hardware-SKU specific. 

How does the free licensing work?

Similar to the free MV sense licenses, Meraki provides five free licenses for MT sensors to all new and existing organizations, and these licenses do not expire. Note that these licenses cannot be transferred to another organization in either co-term or PDL model.

Connectivity

How do MT sensors communicate with the Meraki dashboard?

MT sensors uses Bluetooth® Low Energy to communicate with Meraki IoT gateways.

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Supported IoT gateway devices are second-generation MVs and Wi-Fi 6 MRs. A full list of supported gateways is below.

MV MR
MV2, MV12(W/NE), MV22(X), MV32, MV72(X)

Wi-Fi 5 Wave 2 APs - MR33, MR42, MR42E, MR52, MR53, MR53E, MR74, MR84

Wi-Fi 6 APs - MR28, MR36, MR36H, MR44, MR45, MR46, MR46E, MR55, MR56, MR76, MR78, MR86 

Wi-Fi 6E APs - MR57, CW9162-MR, CW9164-MR, CW9166-MR

WARNING: Environmental sensors are only supported with second-generation MV cameras and compatible MR APs.

Do MT sensors support Wi-Fi 5 (802.11ac Wave 2) APs as gateway?

Yes. The MT functionality was ported to support Wi-Fi 5 APs as a gateway. The minimum firmware requirement for MT support on Wi-Fi 5 APs is MR 28.6+. Please refer to the list of compatible gateways for accurate and up-to-date information.

How does the sensor connect to its gateway?

As long as the minimum requirements are met as per the MT Installation Guides and the sensor is within range of the gateway, it will automatically connect to any compatible gateway that picks up the Bluetooth Low Energy advertisement of the sensor.

MT sensors cannot be assigned to a specific gateway. When the sensor wake up, they will connect to any gateway in range that is in the same Dashboard network.

What happens when MTs can’t communicate with the Meraki dashboard?

MT sensors have onboard storage that will retain approximately the last five days of data. Upon reconnecting to the Meraki dashboard, all data points will be uploaded.

Sampling rate and frequency of connections

In order to conserve battery life, MT sensors are in sleep mode the majority of the time. They wake up at a set regular interval to connect and report  data to the gateway, which in turn uploads it to the Meraki cloud. Below is the sampling rate and connections per device type:

MT10 Data sampling: 2 minutes
Connection interval: 20 minutes
MT11 (w/temperature probes)

Data sampling: 2 minutes
Connection interval: 20 minutes

MT12 Data sampling: event driven
Connection interval: 20 minutes
MT14

Data sampling: 
Temperature / Humidity: 2 minutes
Ambient Noise / PM 2.5: 5 minutes
TVOC: 90 seconds

Connection interval: 20 minutes

MT20 Data sampling: event driven
Connection interval: 20 minutes

All sensors will wake up immediately if a configured threshold has been violated or if any event occurs in binary sensors like MT12 or MT20.

Deployment 

What firmware on MV and MR is required for MT to work?

MV MR

2nd Gen MVs - MV 4.8 +

MV2 - MV 4.17+

Wi-Fi 5 APs - MR 28.6 +

Wi-Fi 6 APs - MR 27.6 + 

Wi-Fi 6E APs - MR 28.6+

Please refer to Managing Firmware Upgrades to schedule an upgrade.

 

How far can the MTs be placed from the MR/MV gateway?

MT sensors use Bluetooth Low Energy 4.2 to communicate with the gateway. Since Bluetooth Low Energy operates between 2.402 and 2.480 GHz, the range depends on the same principles as 2.4 GHz Wi-Fi. 

How many sensors can be used per gateway?

It is recommended to have a maximum of 32 sensors per gateway to ensure connection quality.

Minimum firmware requirement for a gateway to support 32 sensors:

MR - 28.5+

MV - 4.14+

Any firmware older than above only supports eight sensors per gateway.

Are MTs rated for outdoor use?

No, MT devices are designed for indoor use only. The MT12 is IPX5-rated (can resist a sustained, low-pressure water jet spray) and has a rubber liner to separate the power/battery compartment from being splashed or exposed to water. Still recommended NOT to submerge in water, as the rating states.

What are the supported temperature and humidity ranges for the MT10?

The temperature sensor supports 0°C - 55°C / 32°F - 131°F (accuracy: +/- 0.3°C) while using the included AA batteries. The humidity sensor ranges from 0-95%. That said, it is NOT an outdoor (IP67) or harsh environment-rated product. 

MT11 temperature probes supported range

Below are the specified temperature ranges of the MT11 temperature probes. Note that the operating temperature of the MT11 body is 0°C - 55°C / 32°F - 131°F.

Bare metal probe MA-CBL-TEMP-ME-1)
Range: -40°C - 55°C
Accuracy:
-10°C - 55°C = +/- 0.5°C
-30°C - 55°C = +/- 1°C
-40°C - 55°C = +/- 2°C


Glycol probe (MA-CBL-TEMP-GL-1)
Range: -40°C - 55°C
Accuracy:
-10°C - 55°C = +/- 0.5°C
-30°C - 55°C = +/- 1°C
-40°C - 55°C = +/- 2°C

Can MT10 be used to monitor temperature and humidity inside of a freezer?

The sensors are not IP rated and we do not recommend installing them inside of freezers.

Can the MT11 temperature probes be used to monitor temperature of fluids?

No. MT11 temperature probes are not rated to monitor temperature of any fluids, including water. 

Do the MT10/MT11 temperature sensors need to be calibrated?

No. The MT10 temperature sensor and the MT11 temperature probes use a digital sensor that comes pre-calibrated during the manufacturing process. This means no calibration is required during the product life cycle.

Does the MT14 Air Quality Sensor need to be calibrated or cleaned?

No. The MT14 does not require any external calibration or cleaning. Some of the internal components are designed to be self-calibrated and also have cleaning routines. Below is the breakdown on a metric basis:

1. Temperature/Humidity - Same component used in MT10 and that doesn't require any calibration.

2. Total Volatile Organic Compound (TVOC) - This component has a self-calibrating mechanism which essentially "learns" the environment it is installed in. Upon 1st boot (from box), the refinement period may last up to 48 hours. This refinement period is ran every time the sensor is rebooted but it usually lasts a few hours (1st boot has the longest period).

During the TVOC Refinement Period, the readings may not be accurate as the sensor is still calibrating the baseline metrics.

3. PM2.5 - The PM2.5 component doesn't require any calibration. However, it does have a cleaning mechanism which essentially ramps up the fan at the bottom of the device at full speed to blow out any dust that has accumulated on the sensor. The routine runs every 72 hours.

For best results, it is highly recommended that the device is installed with the vents facing down to assist with both calibration and cleaning routines.

What part of the MT12 is capable of detecting water?

The full length of the cable can detect water as little as 3 mL. The cable is 8 ft long, and can be extended to 16 ft with an optional second cable attachment.

The leak detection cable(MA-CBL-LEAK-1) is sold separately.

What are the power requirements for MT sensors?  

Here is a list of all the MT sensors and their supported power requirements.

Model # of Batteries Expected Battery Life External Power
MT10 2 5 Years Yes
MT11 2 (pre-installed) 5 Years Yes
MT12 2 5 Years Yes
MT14 4 2 Years Yes (required for PM2.5 readings)
MT20 1 up to 5 Years* No
MT30 1 up to 5 Years* Yes

 

NOTE:
1. MT20 and MT30 Battery life is dependent on the usage of the sensors. The expected battery life is based on up to 100 triggers per day.

2. The battery curve of MT sensors is tested and based on a typical usage of Alkaline based battery which is included in the box. Other types of battery cell(such as Lithium) may yield different results. 

Alerting and Monitoring

What kinds of alerting does MT sensors support?

MT sensors support email, SMS, and Webhook alerts out of the box, no Twilio or similar integrations needed. It will also support push updates from the Meraki app. Please refer to the Sensor Alert Profiles article in order to set up alerting.

Do MT sensors support APIs?

Yes. Please visit Help > API docs on the Meraki dashboard for detailed documentation.

 

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