Data Memory

32 MB

Storage Capacity

> 1.04 M arrays

Communication Type

USB, RS-232

Communication Speed

115.2 kBits/second

Communication Parameters

8,N,1 (data bits, parity, stop bits)

Communication Protocol

Modbus RTU

Scan Interval    

10-1440 minutes

USB Driver (not applicable to RS-232 version)

FTDI

Power Supply

Battery pack, or 9‑24V DC external
(Cellular Gateway Supervisor)
D cell, alkaline or lithium (2x), or 12V external (non‑cellular Supervisor)

Operating Time

Please contact geokon

Operating Temperature

−40 °C to +85 °C

(L×W×H)

160 × 260 × 91 mm (Cellular Gateway + Mesh Supervisor)
120 × 122 × 91 mm (Mesh Supervisor)

Data Memory

32 MB

Storage Capacity

Varies by model

Trueness

0.082 Hz

Frequency Precision

±0.146 Hz (99% CI)

Frequency Resolution

±0.002 Hz

Thermistor Accuracy

External thermistor: ±0.5 °C
On-board sensor: ±0.4 °C

Thermistor Resolution

External thermistor: 0.032 °C
On-board sensor: 0.1 °C

Scan Interval    

10-1440 minutes

Power Supply

D cell, alkaline or lithium (2x), or 12V external

Operating Temperature

−40 °C to +85 °C (range varies by power source)

VW Excitation Peak Current

25 mA (max)

VW Frequency Range

400 Hz − 5000 Hz

Sweep/Read Duration per Channel

< 500 mS

Battery Life

Refer to Section 4.2

Dimensions (L×W×H)

120 × 122 × 91 mm (single-channel node)
160 × 260 × 91 mm (four-channel node)
180 × 280 × 101 mm (eight-channel node)

Vibrating wire (VW) channel
lightning protection

Gas discharge tube
High-speed surge protector
Transient voltage suppression diode

Thermistor (TH) channel

Gas discharge tube
Inductor (lower resistance than high-speed surge protectors)
Transient voltage suppression diode

Network

8901-NA

8903-EU

Topology

Star/Mesh/Cluster Tree (Automatic)   

Star/Mesh/Cluster Tree (Automatic)   

Radio Technology

FHSS

FHSS

Radio Frequency, ISM Band

902 − 928 MHz

863 − 870 MHz

Channels

12

12

Range¹

Up to 60 km (15 km x 4 hops)

Up to 22 km (5.5 km x 4 hops)

Transmit Power   

1 W

20 mW

Receiver Sensitivity

−106 dBm

−106 dBm

Antenna (Half‑Wave Dipole)

2.1 dBi

1.6 dBi

¹Line-of-sight, maximum 4 hops

Precision

±26.9 [0.0075]

Arcseconds [Degrees]

Linearity

@±15° FS: ±115.5 [0.0321],
@±8° FS: ±60.6 [0.0168]

Arcseconds [Degrees]

Temperature‑Dependent Uncertainty

68.8 [0.019

Arcseconds [Degrees]/°C

Angle Resolution

0.9 [0.00025]

Arcseconds [Degrees]

Tilt Range

±90

Degrees

Axes

2