REMOTE MONITORING

Bullhorn RM4150S Remote Monitoring Unit

Bullhorn S Series RM4150S and RM4151S RMUs are cellular-based, reliable, two-way remote monitoring units that offer unrivaled protection against surges. They are ideal for rectifiers, tanks, and well casings. Bullhorn S Series RM4150S cellular, surge-hardened RMUs withstand the most extreme environments.

End-of-Sale Notice — RM4150S Rectifier RMU
The RM4150S Rectifier RMU is no longer available for purchase. The Last Date of Repair (LDOR) is September 1, 2028 and End of Life (EOL) is September 1, 2030.

Replacement Product: RM510 Rectifier RMU

Why Choose Bullhorn RM4150S RMUs

Bullhorn S Series RMUs monitor your critical data points, including AC and DC volts, pipe-to-soil potential, shunts, instant off, and accumulators.

RM4150S Specifications

Inputs
5 Analog Channels (RM4151S has 2 analog channels)
DC Voltage Range±150 V with accuracy of 1% of reading
AC Voltage Range150 V with accuracy of 1% of reading
Input Impedance10 MΩ
Scan RateOnce every 30 seconds
Channel-to-Channel Isolation≥ 250 V DC
SurgeSurvives multiple 30KV strikes. Tested using 50uS waveform to simulate lightning strike
2 Digital Channels
FunctionsDigital input, accumulator, accumulator reset, or contact closure (0 – 24 V DC)
Minimum Logic1 = 2 V
Maximum Logic0 = 1 V
Scan Rate20 scans per second
Minimum Pulse Width250 ms
Interruption
Switch Out Channel
Maximum Current500 mA DC
Output Voltage10-14 V DC
Minimum Switching Cycle1 s
On/Off Cycle Increments100 ms
Interruption ModesDaily, interference, start/stop, continuous, and Instant Off
Interference ModesSet up to 99 rectifiers or groups for influence studies
Relay TypesNO or NC, solid state or mechanical
Instant Off
Analog Channel 3± 10 V DC, sampled 60 times per sec
IR Drop Edge Delay0 to 60 seconds in increments of 1 ms
ConfigurationGPS-synchronized measurement using configurable on, off, and delay settings
Communications
GSM CellularWorldwide compatibility on LTE cellular networks
USACarrier independent. Automatically selects the best signal.
Poll, reconfigure, set alarm thresholds & update firmware over-the-air
Software Interface
Bullhorn Web
Bullhorn Tools for PC
Power Supply
AC100 – 240 V AC with included AC/DC converter
DC10 – 14 V DC (9 – 36 V DC with optional external DC/DC supply)
BackupInternal sealed rechargeable battery
Dimensions
RM4150S/RM4151SPolycarbonate enclosure (5” x 2.25” x 8”)
External Mount (Optional): Part #517200-000Aluminum Enclosure
(7.3” x 4” x 12.4”)
Environment
Temperature-30° C to +70° C
Humidity0-95% non-condensing
Safety and Compliance
EmissionsFCC Part 15