Model MD908 ‘IRIS’ Tilt Switch

The IRIS Tilt Switch and Controller is a powerful tilt controller device that combines a digital, dual-axis clinometer and advanced firmware features in one compact unit. This remarkable instrument enables you to measure and respond to rotational movements in any direction concerning the unchanging gravity vector. Units ship standard with a 24-inch hook-up cable. IRIS is an ideal choice for OEM applications, where it can be used to maintain platform levelness, avoid tip-over conditions, prevent out-of-range movement, and perform other control functions.


Additional Information

Weight 1.1 oz
Dimensions 2.6 × 2.6 × 1 in

• 5 user-programmable thresholds
• TTL-compatible CMOS outputs (0-5VDC)
• RS-232 or RS-422 (RS-485 full-duplex) output
• Measures rotational movement in two orthogonal vertical planes
• Output data formats for X-tilt, Y-tilt, temperature, and serial number
• Sensitive to <0.002°
• User-programmable settings include: AUTO-zero (tare), sample averaging, and hysteresis control

Performance Specifications

Angular Range (°)±10±25±50
Resolution (°)0.0020.0040.01
Repeatability (°)
Non-linearity (%)111
Output Voltage (V)RS-232, RS-422 (RS-485 full duplex)
Output FormatNMEA XDR, Trimble TCM, BAE, Ashtec compatible, Simple (default: X, Y, Temperature, S/N)
Temperature OutputOn-board temperature sensor
Sample Rates10 samples/second to 1 sample/24 hours
Baud Rate9600 (default), 19200, 28800, 57600, 115200, 230400
Data FormatNMEA XDR, Trimble proprietary, Ashtech compatible, Simple (x, y, temperature, serial number)
ChannelsX-tilt, Y-tilt, Temperature, Serial No.
Tilt Switch Controls8 TTL-compatible CMOS control outputs (0-5 VDC); 20mA source Power per channel (not to exceed 100mA across all 8 channels)
Kz Coefficient (°/C, typical)10 arcsec
Ks Coefficient (%/C, typical)0.03
Time Constant (seconds)0.15
Natural Frequency (Hz)7
Input Voltage (Hz)7-28 VDC, 250mV ripple max
Input Current (Hz)27-30mA for RS-232 output
48-51mA for RS422/485 output
Current draw over the whole operating temperature range
If the H3 header outputs are used, this may draw up to an additional 20 to 100mA
ProtectionReverse polarity & surge protection
Power7-28 VDC, 250 mV ripple max, reverse polarity protected
Environmental-40 to +85°C operation and storage. 100% humidity, IP65
ConnectionsThree 60cm (2 ft) cables included: Signal (H1), Power (H2), Control Outputs (H3)
MaterialsGlass electrolytic sensor, fiberglass PCB

*Specifications subject to change without notice on account of continued development.


Outline Drawing
User Manual

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