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Specifications of the K-500 Remote Terminal Unit
Standard Equipment
| RTU Board |
| Board options |
Analog input board
Digital I/O board
Communications board |
| Enclosure System |
| Aluminum NEMA 4 enclosure with display cutout |
16 × 12 × 10 in.
40.6 × 30.5 × 25.4 cm |
| Steel NEMA 4 enclosure with display cutout |
16 × 14 × 6 in.
40.6 × 35.6 × 15.2 cm |
| Pole mounting flanges |
2 in.
5.1 cm |
| Power Requirements |
| Voltage |
11.5 to 16.0 VDC |
| Ultra-low power |
<1/4 W (16 ma at 13.6 DC) |
| Built-in battery voltage measurement |
Internal analog input |
| Memory |
| Flash firmware memory |
512 KB |
| Standard RAM* |
512 KB |
| Environmental |
| Temperature tolerance |
–40° to 158°F
–40° to 70°C |
| Relative humidity tolerance, non-condensing |
0 to 95% |
| Communications |
| 1 RS-232 user interface port (LOS) |
1 RS-485 device interface port (simultaneous protocols),
9600 baud, 8 data bits, no parity, 1 stop bit |
CIM protocol
Siemens digital level probe protocol
Modbus RTU master protocol |
| 1 connector for pluggable communications port options |
RS-232 board
Spread spectrum radio board
RS-485 board |
| Scheduled power control of communications device |
| Standard communications protocol |
Kimray native |
| Optional communications protocols |
Enron Modbus
DNP3 |
| RTU System Options |
| LCD 2-line display |
| Battery charging regulator |
Built-in or external mounting
5-amp DC maximum charging current |
| Built-in multivariable flow transmitter (MVT) |
| User interface jack (LOS jack) |
*Lithium-battery backed-up RAM
Digital Input/Output Board
| Inputs |
| 4 discrete inputs (contact closure) |
| Optical isolation |
1500 VDC |
| Isolation resistance |
100M ohm |
| Transient protection |
IEEE 472-1974 |
| Terminals |
Compression type |
| LED indicator for each input |
| Outputs |
| 2 SPDT relays |
| Rating at 277 VAC, 30 VDC |
10 amp |
| Isolation |
1500 VAC |
| 1 open collector |
1-amp rating |
| Terminals |
Compression type |
| LED indicator for each output |
| Accumulator Input |
| 1 high-speed pulse input |
| Jumper-selectable filtering |
30 Hz, 1000 Hz, or none |
| Optical isolation |
1500 VDC |
| Isolation resistance |
>100M ohm |
| Transient protection |
IEEE 472-1974 |
| Plug-in terminals* |
Compression type |
| Maximum pulse rate |
25 KHz |
| LED indicator |
*Plug-in will accept optional pulse amplifier board
Analog Input Board
| Two single-ended inputs |
| Resolution |
12 bit |
| Accuracy |
±0.05% of full-scale accuracy,
+1/2 lsb at 77°F (25°C) |
| Temperature compensation |
13.89 ppm/°F (25 ppm/°C ) |
| Input signal options |
1 to 5 V or 4 to 20 mA DC input range,
jumper selectable |
| Calibration |
Software-based 3-point curve-fit
calibration for each input |
| Terminals |
Compression type |
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