Part Number
BA/HQX-C-A-1-X90-N
Humidity Output
4-20 mA
Temp Sensor
10K-3 Thermistor
Mounting
Standard J-Box
Warranty
5 Years
The BA/HQX-C-A-1-X90-N is a BAPI-Stat Quantum combination room temperature and humidity sensor with a 10K-3 Thermistor temperature element and 4-20 mA humidity output. An on-unit slider provides occupant setpoint adjustment with a No Setpoint display range and Special (90) output to the controller. Occupancy override is configured as Parallel w/ Sensor. The capacitive polymer humidity element is factory-calibrated to ±2% RH at 25°C across the 20 to 80% RH range.
Best For
Occupied spaces where the BMS needs both ambient temperature and humidity feedback alongside occupant comfort control. The slider setpoint and override give occupants comfort input while maintaining BAS authority over scheduling and limits.
5-YEAR WARRANTY
Backed by BAPI's 5-Year Warranty. Factory-calibrated and tested to BAPI's quality standards before shipment.
Key Features
Sensor-Only Configuration
Configured without an LCD display for sense-only applications where the controller handles all logic and feedback.
Capacitive Polymer Humidity Element
Long-term stable capacitive polymer sensor ±2% RH at 25°C across the 20 to 80% RH range, factory calibrated.
10K-3 Thermistor Temp Sensor
Passive 10K Type III Thermistor temperature element compatible with most BAS controller inputs.
Slider Setpoint Adjustment
Front-panel slider for occupant setpoint adjustment with No Setpoint display range and Special (90) output to controller.
Occupancy Override Button
Push-button occupant override configured as Parallel w/ Sensor. Human Icon on display indicates override status when latched by controller XIN signal.
Field Calibration
±5% RH field calibration adjustment in 0.1% increments via potentiometer (units without display) or programming pages (units with display).
Technical Specifications
| Part Number | BA/HQX-C-A-1-X90-N |
| Sensor Type | Room Temperature + Humidity |
| Humidity Sensor | Capacitive Polymer, ±2% RH @ 25°C, 20 to 80% RH |
| Humidity Output | 4 to 20 mA Output |
| Temperature Sensor | 10K Type III Thermistor |
| Temp Accuracy | ±0.36°F Thermistor, ±0.5°F RTD (typical) |
| Display | No Display |
| Setpoint Adjustment | Slider Setpoint Adjustment |
| Setpoint Display Range | No Setpoint Adjustment |
| Setpoint Output Range | Special Setpoint Output Range (Code 90) |
| Occupant Override | Override in Parallel with Sensor |
| Power | 12 to 35 VDC |
| Power Consumption | 20 mA max (4-20 mA), 4 mA max (0-5/0-10 VDC), 0.1 VA max (AC) |
| Field Calibration | ±5% RH in 0.1% increments (factory calibrated) |
| Wiring | 2 to 5 pair, 16 to 22 AWG |
| Mounting | Standard 2"x4" J-Box Mount |
| Operating Range | 32 to 122°F (0 to 50°C), 0 to 95% RH non-condensing |
| Enclosure | ABS Plastic, UL 94 V-0 |
| Agency | CE EN 61326-1:2013 EMC, RoHS |
| Warranty | 5 Years |
Documentation
Frequently Asked Questions
What setpoint output options are available with the 4-20 mA humidity model?
On 4-20 mA humidity output models, voltage-output setpoints (0-5V or 0-10V) are not available because the 4-20 mA current loop shares the COM terminal. Resistive setpoint outputs (0-1KΩ, 0-10KΩ, 0-20KΩ, etc.) are fully supported.
What is the humidity sensor accuracy?
±2% RH at 25°C (77°F) across the 20 to 80% RH range, using a capacitive polymer sensing element. Field calibration adjustment of ±5% RH in 0.1% increments is available.
What temperature sensor is included in the BA/HQX-C-A-1-X90-N?
This unit is configured with a 10K Type III Thermistor. The temperature sensor is passive (resistance output) and connects to terminals SEN1 and SEN2.
How does the occupancy override work?
Pressing the override button closes a dry contact across the override output (resistance <15 ohms) and lights the Human Icon on the display. To latch the icon, the controller must connect terminal XIN to ground via a dry contact. Without the XIN confirmation signal, the icon clears after 5 seconds.
Can this sensor be field-calibrated?
Yes. Humidity offset is set via potentiometer R12 on the circuit board, providing ±5% RH adjustment in 0.1% increments. A high-accuracy humidity reference is recommended.
What mounting options are supported?
Standard 2"x4" junction box, drywall mount with included anchors, or European junction box (60mm mounting centers using the BA/HQ60 variants). Mounting screws are included.
