====== Alerton Microset II ======
**Installation and Operations Guide**

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===== Introduction =====

{{ :devices:microset:microsetii.png?120|Alerton Microset II}}The Microset(tm) II is a wall-mounted sensor for BACtalk(r) VLCs((The Microset II is not compatible with the Alerton TUX product line)). Depending on the VLC version, the Microset II may be interchangeable with previous version BACtalk Microsets. See "[[devices:microset:eariler-vlc-compatibility|Compatiblity with Earlier Version VLCs]]" for details. The Microset II has a backlit liquid crystal display (LCD) and intuitive button operation. It connects to a VLC using three low-voltage wires. The Microset II exchanges data and receives commands from a VLC using a range of AV and BV data points in the VLC that are reserved for Microset operation. These data points are available from the VLC as BACnet objects.

===== Features =====
  * Outside temperature displayed at all times
  * Space (room) temperature displayed at all times
  * Optional outside and room himidity display
  * Fan speed display/adjustment (up to three speeds and Off)
  * Setpoint display and adjustment
  * After-hours and housekeeping overrides
  * Heating or cooling mode display
  * English or metric units
===== Specifications =====
Table 1: BACtalk Microset II specifications\\ 
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|**Thermistor**|The thermistor is integrated with the device. The unit is a microprocessor-based sensor with a built-in analog to digital converter for temperature and humidity, which is designed to communicate directly with VLCs|
|  Type|Uni-curve Type II|
|  Resistance|10kΩ at 77ºF (22ºC)|
|  Interchangeability|0.36°F (0.2°)|
|  Time Constant((Based on normal operating conditions))|10 seconds (to 66% of new temperature)|
|  Stability((Based on normal operating conditions))|0.036°F (0.02°C) drift per year|
|  Accuracy((Based on normal operating conditions)) |±0.36°F (0.2°C) over range of 32–158°F (0–70°C)|
|**Power** |24 VAC/VDC @ 25mA for backlit display. Orange lead terminates to 24 VAC or 24 VDC terminal on VLC. Sensor draws 5 VDC @ 10 mA from VLC. |
|**VLC connection** |24 VAC/VDC @ 25mA for backlit display. Orange lead terminates to 24 VAC or 24 VDC terminal on VLC. Sensor draws 5 VDC @ 10 mA from VLC. |
|**Dimensions** |4.6" (117 mm) H X 3.0" (76 mm) L X 0.7" (18 mm) D |
|**Humidity sensor** |Optional |
|   Total accuracy | ±2% RH, 0–100% RH @ 25°C, with saturated salt calibration|
|   Operating temp. |-40–185°F (-40–85°C) |
|   Repeatability |±0.5% RH |
|   Interchangeability |±5% RH up to 60%RH, ±8% RH at 90% RH (typical humidity)|
| **Ratings** |Listed Underwriters Laboratory as an accessory for VAVs and VLCs\\ EMC Directive 89/336/EEC (European CE Mark), pending\\ FCC Part 15, Subpart J, Class A. pending |