Does the HMSZB-110 need a frient hub to work with Edge?

No. It is a standard Zigbee Home Automation sensor using the standard temperature and humidity clusters, so it joins the Zigbee radio on an EpiSensor Gateway and Edge reads it directly.

How long do the batteries last, and when should I change them?

Onics rates the two AA cells for up to five years when the sensor reports every five minutes. Replace them when the battery voltage reaches 2.45 V. The red LED blinks twice every 60 seconds once the battery is low.

What is the difference between the HMSZB-110 and the HMSZB-120?

The HMSZB-120 is the model sold under the frient brand. The Zigbee2MQTT converter handles both model identifiers with the same definition, so they expose the same temperature, humidity and battery readings.

Develco HMSZB-110 Zigbee temperature and humidity sensor

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 5 values from it, listed under Interface.

Connect it with

Gateway ZGW-20
From €899 ex VAT Configure Gateway

Specifications

The HMSZB-110 is Develco's indoor temperature and humidity sensor, sold under the frient brand as the Smart Humidity Sensor. Develco Products now trades as Onics, and newer units report Onics A/S as the manufacturer name. It measures temperature from 0 to 50 °C at 0.1 °C resolution and relative humidity from 0 to 100 % RH at 1 % RH resolution. Onics gives a typical accuracy of ±0.5 °C (±2 °C maximum) and ±3.5 % RH between 20 and 80 % RH.¹

Power: Battery. Two exchangeable AA cells, rated for up to five years when reporting every five minutes. Replace them at 2.45 V.¹
Temperature range: 0 to 50 °C¹
Temperature resolution: 0.1 °C¹
Temperature accuracy: ±0.5 °C typical, ±2 °C maximum¹
Humidity range: 0 to 100 % RH¹
Humidity resolution: 1 % RH¹
Humidity accuracy: ±3.5 % RH typical, 20 to 80 % RH¹
Sample time: Configurable, 2 to 65,000 s¹
Operating conditions: 0 to 50 °C, 10 to 95 % RH non-condensing¹
Wireless: Zigbee Home Automation 1.2¹
Radio: -92 dBm sensitivity, +3 dBm output power¹
Ingress protection: IP20¹
Dimensions: 70 × 70 × 21 mm²
Mounting: Adhesive tape or screws, both included¹

Where it is used

Room temperature and humidity in offices, schools and homes, for comfort, ventilation control and early warning of damp and mould.
Indoor environmental monitoring
Ambient conditions in comms rooms and small server rooms, where a battery sensor avoids new cabling.
Server room and rack temperature monitoring
Archives, stores and rooms holding humidity-sensitive stock, furniture or instruments, where a slow drift in relative humidity is the thing to catch.

Interface

On the Zigbee network it joins as an end device.¹

Readings and settings, with units and ranges where Develco publishes them.

Download

Reading	Unit	Range or values	Access
Measurements 2
Temperature	°C	-	Read only
Humidity	%	-	Read only
Diagnostics 3
Battery	%	0 to 100 %	Read only
Voltage	mV	-	Read only
Battery low	-	Binary state	Read only

Temperature and humidity sit on endpoint 38 (0x26), in the standard Temperature Measurement (0x0402) and Relative Humidity Measurement (0x0405) clusters. Battery voltage comes from the Power Configuration cluster in units of 100 mV.¹

Default reporting uses a 60 s minimum interval, a 600 s maximum interval and a reportable change of 0.1 °C or 3 % RH. A stable room therefore produces one report of each value every 10 minutes.¹

The low-battery flag turns on at 2.5 V or less. Onics advises replacing the cells at 2.45 V, and the red LED blinks twice every 60 seconds when the battery is low.^1, 3

The sensor sends a keep-alive every 15 minutes. After five unanswered keep-alives, up to 1 hour 15 minutes, it starts scanning for its network again.¹

Setup

Open pairing in Edge
In Edge, open pairing on the Gateway's Zigbee network. The Gateway accepts new devices while pairing is open.
Insert the batteries
Fit the two AA cells. A sensor that has never joined a network starts searching straight away, scanning Zigbee channels 11 to 24, and its LED flashes once a second while it searches.¹
Reset a used sensor first
If it has been on another network, press and hold the button. The LED blinks once, then twice, then continuously. Release it while the LED blinks continuously to reset it to factory settings, after which it searches for a network.¹
Confirm the join
The LED stops flashing once the sensor has joined. Check that Edge identifies it as model HMSZB-110. If it gives up searching, it sleeps for 15 minutes between scans: hold the button until the LED blinks once and release it to start a fresh three-minute search.¹
Check one reading
Place a reference thermometer and hygrometer beside it and compare. Allow for the first scheduled report, which can take up to 10 minutes in a stable room.¹

Common questions

Does the HMSZB-110 need a frient hub to work with Edge?: No. It is a standard Zigbee Home Automation sensor using the standard temperature and humidity clusters, so it joins the Zigbee radio on an EpiSensor Gateway and Edge reads it directly.¹
How long do the batteries last, and when should I change them?: Onics rates the two AA cells for up to five years when the sensor reports every five minutes. Replace them when the battery voltage reaches 2.45 V. The red LED blinks twice every 60 seconds once the battery is low.¹
What is the difference between the HMSZB-110 and the HMSZB-120?: The HMSZB-120 is the model sold under the frient brand. The Zigbee2MQTT converter handles both model identifiers with the same definition, so they expose the same temperature, humidity and battery readings.³