OMEGAPHONE® 7 Channel 4 to 20 mA Input Alarm Dialers

OMA-VM500-4, OMA-VM500-4-B20 and OMA-VM500-4-B30

OMEGAPHONE® 7 Channel 4 to 20 mA Input Alarm Dialers | OMA-VM500-4, OMA-VM500-4-B20 and OMA-VM500-4-B30

OMEGAPHONE® 7 Channel 4 to 20 mA Input Alarm Dialers

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  • Monitors 7 Channels of 4 to 20 mA Input, One Dry Contact Input and Power Status
  • Isolated Inputs Prevent Ground Loops
  • Program up to Four 20 Digit Phone Numbers
  • Works with Telephone Pagers
  • Integral 4-Line LCD Display Wall Mount Enclosure
  • Wall-Mount Enclosure


Discontinued product - please contact the Data Acquisition Dept for possible substitutes

Model OMA-VM500-4 monitors up to seven 4 to 20 mA inputs and dials up to four phone or pager numbers if any 4 to 20 mA input goes out of limits, if the dry contact input is not in its programmed normal state, or if there is a power outage. The integrated voice tells you which input is out of limits. You can call the unit at any time to hear a report on the input and power status.

The OMA-VM500-4 is easily programmed over the phone. Simply locate the unit in the area where you want to measure the 4 to 20 mA inputs. Plug in the phone line and the power adaptor, turn the unit on and then call the unit from another phone or cell phone. Follow the spoken instructions and the instructions in the operator’s manual to program the phone numbers where you want the dialer to call in case of an alert condition and the upper and lower limits for the 4 to 20 mA signals. Then hang up by pressing the "0" key on your phone until the unit says "Good-bye." The system is now programmed and is monitoring your facility for 4 to 20 mA input and power status.

Number of Analog Inputs: 7
Sensor Type: Self-powered 4 to 20 mA output sensors
Sensor Input: Isolated, 20 Ohm input impedance
Response Time: 50 ms
Accuracy: ±0.05 mA
High and Low Limits on 4 to 20 mA Inputs: Programmable
Scaling in Engineering Units for each 4 to 20 mA Input: programmable
Dry-Contact Input: 12 Vdc 10 mA source;
input is normally open
Telephone: Standard RJ11 phone jack connection
Telephone Numbers: Stores up to four phone
numbers up to 20 digits long
Personal Identification Message:
Records up to a 10-second message over the phone
Operation: Operates with answering
machine on the same phone line
Display: Integral 4-line LCD
Alarm Notification: Alarm siren
sounds and alarm relay closes if any
input goes out of limits
Alarm Cancellation: Pushbutton on front of the unit
silences the alarm and cancels
emergency telephone calls
Alarm Relay Output: 5 A, 125 Vac
Alarm Buzzer: 85 dB
Power: Powered from included 120 Vac
wall mount transformer power supply
Battery Backup: 4-hour
rechargeable battery backup;
20 or 30 hours optional
Operating Temperature: 0 to 52°C (32 to 125°F)
Electrical Connections: Plug-in terminal block
117 H x 223 W x 57 mm D
(4.62 x 8.79 x 2.26")
Material: ABS plastic
Weight: 0.9 kg (2 lb)
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