Ordering Info and Specifications

Bus Probes are available in five versions:

BP#01 — Ambient temperature sensor
BP#02 — Ambient temperature and humidity sensor
BP#03 — Ambient light sensor
BP#04 — Three-axis accelerometer
BP#05 — Flood/leak sensor
BP#06 — Opto-isolated digital input (DI)

Specifications

Interface	Half-duplex (two-wire) RS485 interface
Communications parameters:	Baudrate depends on the firmware version: Prior to V1.02, Bus Probes operate exclusively at 38,400bps From V1.02, baudrate is user-selectable (see Setting Baudrate) 8-bit Parity: Prior to V1.06, no parity option was available From V1.02, the odd, even, mark, and space parity options can be set One stop bit⁽¹⁾
Protocol	Modbus RTU
Power supply range	4VDC~15VDC
Current consumption	BP#01 ~ BP#04 — 2.5mA average @ 5V/12V with spikes of up to 6mA BP#05 — 16mA average @ 5V/12V with spikes of up to 25mA during Modbus communications BP#06 Idle — 4mA average @ 5V/12V Polling — 7mA average @ 5V/12V with spikes of up to 20mA
BP#01 (ambient temperature sensor)	Measurement range: –40°C to 125°C⁽²⁾ Measurement resolution: 0.25°C Measurement accuracy: ±1°C⁽³⁾
BP#02 (ambient temperature and humidity sensor)	Temperature measurement: Measurement range: –25°C to 50°C Measurement resolution: 0.5°C Measurement accuracy: not specified⁽⁴⁾ Humidity measurement: Measurement range: 10% to 90% RH Measurement resolution: 0.1% RH Measurement accuracy: ±5% RH⁽⁵⁾ Temperature range for valid humidity measurements: 5°C to 50°C
BP#03 (ambient light sensor)	Measurement range: 1 to 8,191 lux Measurement resolution: 1 lux Measurement accuracy: 1 lux
BP#04 (Three-axis accelerometer)	Independent X, Y, and Z axes Measurement range for each axis: ±6G Measurement resolution for each axis: 0.003G Measurement accuracy for each axis: 0.1G
BP#05 (flood/leak sensor)	Reliably detects the presence of water and water-diluted liquids⁽⁶⁾ While the companion sensor cable is designed for immersion in liquids, the Bus Probe's body is not waterproof Two sensitivity levels: normal and reduced⁽⁷⁾ (controlled by register 701) Companion sensor cable supported length: 30cm to 30m Inductor-less isolation of the detection circuit from the power and RS485 bus ±65V fault and short-circuit protection for the RS485+ and RS485– lines ±40V common-mode voltage range for the RS485+ and RS485– lines Hot-swap protection
BP#06 (opto-isolated digital input)	Unidirectional optically isolated digital input (DI) suitable for 2/3-wire sensors with reduced power consumption Optimized for 24VDC industrial inputs, especially Type-3 sensors Input V-I characteristics (see the figure below): Wide input range compliant with IEC 61131-2 Type 3 criteria V_in (threshold): 11VDC ~ 12.4VDC (depending on temperature) V_in (maximum): 60VDC (operating), with spikes up to 80VDC (absolute) I_in (threshold): 2.2mA±0.3mA (complete voltage and temperate range) Input current clamped to 3.5mA Reverse voltage current across acceptable range: < 20µA Protection and reliability features: Protection against high-voltage transients on the line Digital input reverse polarity protection up to –80VDC Digital input isolation voltage: 2.5kV ±65V fault and short-circuit protection for the RS485+ and RS485– lines ±40V common-mode voltage range for the RS485+ and RS485– lines Hot-swap protection for all terminals Sampling time: Instant (register 800) 0.25ms filtered (register 801)
Operating temperature range	–40°C to +85°C⁽⁸⁾⁽⁹⁾
Operating relative humidity	10% to 90%
Mechanical dimensions (excluding terminal blocks)	40.0 x 36.0 x 19.0mm

If two stop bits are required, from V1.06 the parity can be set to the mark mode, which is equivalent to 8-N-2 (8 bits of data, no parity, and two stop bits).
The actual measurement range is limited by the operating temperature range of the Bus Probe itself, which is –40°C to +85°C.
Independent lab tests commissioned by our Romanian distributor (Electric Film S.R.L.) found BP#01's measurement accuracy for ambient temperature to be ±0.45°C or better.
Independent lab tests commissioned by our Romanian distributor (Electric Film S.R.L.) found BP#02's measurement accuracy for ambient temperature to be ±0.5°C or better.
Independent lab tests commissioned by our Romanian distributor (Electric Film S.R.L.) found BP#02's measurement accuracy for relative humidity to be ±3.8% or better.
After immersion in any liquid that can leave residue, BP#05's companion sensor cable should be cleaned, inspected, and tested to ensure that it remains conductive. Contact with highly acidic or alkaline substances can permanently damage the cable.
The normal sensitivity mode can detect even small amounts of water on the companion sensor cable. The reduced sensitivity mode helps to avoid false positives due to condensation or high levels of humidity in the operating environment.
While the sensor is capable of operating from –40°C to +85°C, BP#05 will only reliably detect water in its liquid phase.
BP#05 and BP#06 were tested according to procedures I, II, and III of MIL-STD-810H Method 501.7 and MIL-STD-810H Method 502.7.

Disclaimer

All specifications are subject to change without notice and are for reference only. Tibbo assumes no responsibility for any errors in this documentation, and does not make any commitment to update the information contained herein.

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