361A, 461A: Limit Alarm; DC Voltage/Current Input, AC or DC-Powered
Product short description:
- 0 to 20mA DC, 0 to 100V DC, AC current (with optional sensor) input
- Single or dual mechanical relays output
- 10-36V DC or 115/230V AC power
- 100% adjustable set-point, hi/lo fail-safe operation, jumper-selectable voltage/current input
These alarms accept DC voltage/current input signals and provide relay output if the input exceeds user-defined set-point limits.
Numerous options and features make these alarms easy to use and well-suited for a wide range of limit monitoring and on/off controller applications. Three-way isolation eliminates ground loops to simplify installation. And for easier use in the field, these alarms withstand extreme temperatures and have accessible set-point voltage test points. Other features include alarm/power status LEDs and independent set-point and dead band adjustment pots.
Models:
361A: DC-powered
461A: AC-powered
Input Ranges:
0 to 20mA DC
0 to 1V, 0 to 5V, 0 to 10V, 0 to 50V, 0 to 100V DC
0 to 20A AC (with external AC current sensor)
Output:
Electromechanical SPDT dry contact sealed relays; CSA rated for 5A
Power Requirements:
361A: 10 to 36V DC (0.9W max.)
461A: 115V AC (0.0320A) or 230V AC (0.016A)
Performance Specifications
Input
Input:
-V1: 0 to 1V DC.
1M ohm input impedance or 0 to 20mA DC via 50 ohm internal resistor.
-V5: 0 to 5V DC.
1M ohm input impedance or 0 to 20mA DC via 250 ohm internal resistor.
-V0: 0 to 10V DC. 100K ohm input impedance.
-V50: 0 to 50V DC. 500K ohm input impedance.
-V100: 0 to 100V DC. 1M ohm input impedance.
AC Current Sensor (5020-350):
Used with -V1 input option only.
Input range is function of turns placed on sensor.
1 turn = 0 to 20A AC; 2 turns = 0 to 10A;
4 turns = 0 to 5A; 10 turns = 0 to 2A.
Setpoint Adjust:
0 to 115% of input span via 15-turn potentiometer.
Resolution better than 0.1% of span, continuous.
Deadband Adjust (hysteresis): 1 to 100% of input span for each channel via 15-turn potentiometer(s). Adjustments are independent on dual alarm models.
Automatic Reset (non-latching alarms):
The alarm resets to its non-alarm state as soon as input signal is outside of the selected deadband. If the deadband is set to its extreme (100%), then the alarm is effectively latching and will not reset till the input signal is at or below 0%.
Repeatability: Repeatable to better than ±0.1% of input span
Output/Relays
Output:
-SMRN: Single alarm. One SPDT dry-contact sealed relay.
-DMRN: Dual Alarm, two SPDT relays.
Electrical Life – CSA Ratings:
25V DC, 5A, 100,000 operations, resistive.
48V DC, 0.8A, 100,000 operations, resistive.
120V AC, 5A, 30,000 operations, resistive.
240V AC, 5A, 30,000 operations, resistive.
Contact Material : Silver-cadmium oxide.
Breakdown Voltage:
Between open contacts: 1000VAC rms.
Between contacts and coil: 1500VAC rms, 50-60 Hz for one minute.
Mechanical Life: 20 million operations.
Response Time: Fixed delay of 100mS (nominal). Relay transfers £100mS, typical, after input signal exceeds setpoint. Relay transfers within 50mS after input passes deadband, as it returns to normal range.
Power
Power Requirement (361A): 10V to 36V DC.
Current draw is a function of supply voltage.
Currents specified are maximum values with the relay(s) energized.
Supply Mechanical Relay Output
Voltage Single Dual
10V 65mA 100mA
12V 50mA 75mA
15V 40mA 60mA
24V 30mA 40mA
36V 25mA 30mA
Power Requirement (461A):
-1: 115V AC ±10%, 50 to 60Hz, 0.032A.
-2: 230V AC ±10%, 50 to 60Hz, 0.032A.
Power Supply Effect (461A): Trip-point varies less than ±0.05% of input span.
Environmental
Ambient Temperature Range: -13°F to 167°F (-25°C to 75°C).
Ambient Temperature Effect: Less than ±0.01% of output span per °F (±0.018% per °C) over the ambient range.
Isolation: Three way; input, contacts, and power are isolated from each other for common mode voltages up to 250V AC, or 354V DC, continuous (withstands 1500V AC for sixty seconds without breakdown).
Noise Rejection:
Common mode: Better than 100dB at 60 Hz, 250ohm unbalance, typical.
Normal mode: 26dB at 60 Hz, 250ohm source, typical.
RFI Resistance: Unit will not trip under influence of RFI when input is ±0.5% of input span from setpoint voltage for RFI field strengths of up to 10V/meter, at frequencies of 27MHz, 151MHz, and 467MHz.
EMI Resistance: Unit will not trip when input is ±0.25% of input span from setpoint voltage with switching solenoids or commutator motors.
Surge Withstand Capability (SWC): Meets ANSI/IEEE C37.90-1978.
Physical
Construction:
Circuit boards: Military grade FR-4 epoxy glass circuit board, 0.063 inches thick.
Coating: Fungus resistant acrylic conformal coat.
Terminals: Compression type, wire 14 AWG max.
Case: Self-extinguishing NYLON Type 6.6 polyamide thermoplastic, UL94 V-2. NEMA 1 enclosure.
Test points (setpoint): Accepts 0.080″ dia. probe.
Mounting position: Position insensitive
- 100% adjustable set-point via 15-turn pot handles more applications and provides better resolution
- 100% adjustable dead band via 15-turn pot prevents false trips and eliminates alarm chatter
- Set-point test points are accessible on front of unit for quick verification with digital voltmeter probe
- Dual relays offer the flexibility of high/low, high/high, or low/low alarm set-point operation
- Three-way isolation eliminates ground loops
- Jumper-selectable DC voltage or current input reduces inventory stock
- Jumper-selectable fail-safe operation enables alarm actuation on power loss in critical applications
- Wide power supply range (361A) handles more applications to reduce inventory stock
- DC power units (361A only) carry lower voltages and do not require expensive conduit for safer and easier installation
- Diode-coupled power (361A only) supports the use of redundant power supplies for critical applications
- Excellent accuracy, stability and no loose internal wiring ensure reliable alarm trips
- Operating temperature range: -13°F to 167°F (-25°C to 75°C)
- DIN rail G or T mount
- No certification/approval required
Specs & Catalogs
Additional information
| Weight | 16 oz |
|---|---|
| Dimensions | 3 × 1 × 3.2 in |
| Part Number | 361A-V0-DMRN-DIN-NCR: 10 to 36V DC-power; 0 to 10V DC, 100K ohm input impedance; dual alarm, two SPDT relays, 361A-V1-SMRN-DIN-NCR: 10 to 36V DC power; 0 to 1V DC input; single alarm, one SPDT dry-contact sealed relay, 461A-V1-DMRN-1-DIN-NCR: 115V AC power; 0 to 1V DC input; dual alarm, two SPDT relays; 115V AC ± 10% power |
| Product Series | FlatPack Series |
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Description
These alarms accept DC voltage/current input signals and provide relay output if the input exceeds user-defined set-point limits.
Numerous options and features make these alarms easy to use and well-suited for a wide range of limit monitoring and on/off controller applications. Three-way isolation eliminates ground loops to simplify installation. And for easier use in the field, these alarms withstand extreme temperatures and have accessible set-point voltage test points. Other features include alarm/power status LEDs and independent set-point and dead band adjustment pots.
Models:
361A: DC-powered
461A: AC-poweredInput Ranges:
0 to 20mA DC
0 to 1V, 0 to 5V, 0 to 10V, 0 to 50V, 0 to 100V DC
0 to 20A AC (with external AC current sensor)Output:
Electromechanical SPDT dry contact sealed relays; CSA rated for 5A
Power Requirements:
361A: 10 to 36V DC (0.9W max.)
461A: 115V AC (0.0320A) or 230V AC (0.016A)Performance Specifications
Input
Input:
-V1: 0 to 1V DC.
1M ohm input impedance or 0 to 20mA DC via 50 ohm internal resistor.
-V5: 0 to 5V DC.
1M ohm input impedance or 0 to 20mA DC via 250 ohm internal resistor.
-V0: 0 to 10V DC. 100K ohm input impedance.
-V50: 0 to 50V DC. 500K ohm input impedance.
-V100: 0 to 100V DC. 1M ohm input impedance.AC Current Sensor (5020-350):
Used with -V1 input option only.
Input range is function of turns placed on sensor.
1 turn = 0 to 20A AC; 2 turns = 0 to 10A;
4 turns = 0 to 5A; 10 turns = 0 to 2A.Setpoint Adjust:
0 to 115% of input span via 15-turn potentiometer.
Resolution better than 0.1% of span, continuous.Deadband Adjust (hysteresis): 1 to 100% of input span for each channel via 15-turn potentiometer(s). Adjustments are independent on dual alarm models.
Automatic Reset (non-latching alarms):
The alarm resets to its non-alarm state as soon as input signal is outside of the selected deadband. If the deadband is set to its extreme (100%), then the alarm is effectively latching and will not reset till the input signal is at or below 0%.Repeatability: Repeatable to better than ±0.1% of input span
Output/Relays
Output:
-SMRN: Single alarm. One SPDT dry-contact sealed relay.
-DMRN: Dual Alarm, two SPDT relays.Electrical Life – CSA Ratings:
25V DC, 5A, 100,000 operations, resistive.
48V DC, 0.8A, 100,000 operations, resistive.
120V AC, 5A, 30,000 operations, resistive.
240V AC, 5A, 30,000 operations, resistive.Contact Material : Silver-cadmium oxide.
Breakdown Voltage:
Between open contacts: 1000VAC rms.
Between contacts and coil: 1500VAC rms, 50-60 Hz for one minute.
Mechanical Life: 20 million operations.
Response Time: Fixed delay of 100mS (nominal). Relay transfers £100mS, typical, after input signal exceeds setpoint. Relay transfers within 50mS after input passes deadband, as it returns to normal range.Power
Power Requirement (361A): 10V to 36V DC.
Current draw is a function of supply voltage.
Currents specified are maximum values with the relay(s) energized.Supply Mechanical Relay Output
Voltage Single Dual
10V 65mA 100mA
12V 50mA 75mA
15V 40mA 60mA
24V 30mA 40mA
36V 25mA 30mAPower Requirement (461A):
-1: 115V AC ±10%, 50 to 60Hz, 0.032A.
-2: 230V AC ±10%, 50 to 60Hz, 0.032A.Power Supply Effect (461A): Trip-point varies less than ±0.05% of input span.
Environmental
Ambient Temperature Range: -13°F to 167°F (-25°C to 75°C).
Ambient Temperature Effect: Less than ±0.01% of output span per °F (±0.018% per °C) over the ambient range.
Isolation: Three way; input, contacts, and power are isolated from each other for common mode voltages up to 250V AC, or 354V DC, continuous (withstands 1500V AC for sixty seconds without breakdown).
Noise Rejection:
Common mode: Better than 100dB at 60 Hz, 250ohm unbalance, typical.
Normal mode: 26dB at 60 Hz, 250ohm source, typical.
RFI Resistance: Unit will not trip under influence of RFI when input is ±0.5% of input span from setpoint voltage for RFI field strengths of up to 10V/meter, at frequencies of 27MHz, 151MHz, and 467MHz.
EMI Resistance: Unit will not trip when input is ±0.25% of input span from setpoint voltage with switching solenoids or commutator motors.
Surge Withstand Capability (SWC): Meets ANSI/IEEE C37.90-1978.Physical
Construction:
Circuit boards: Military grade FR-4 epoxy glass circuit board, 0.063 inches thick.
Coating: Fungus resistant acrylic conformal coat.
Terminals: Compression type, wire 14 AWG max.
Case: Self-extinguishing NYLON Type 6.6 polyamide thermoplastic, UL94 V-2. NEMA 1 enclosure.
Test points (setpoint): Accepts 0.080″ dia. probe.
Mounting position: Position insensitive -
Features & Benefits
- 100% adjustable set-point via 15-turn pot handles more applications and provides better resolution
- 100% adjustable dead band via 15-turn pot prevents false trips and eliminates alarm chatter
- Set-point test points are accessible on front of unit for quick verification with digital voltmeter probe
- Dual relays offer the flexibility of high/low, high/high, or low/low alarm set-point operation
- Three-way isolation eliminates ground loops
- Jumper-selectable DC voltage or current input reduces inventory stock
- Jumper-selectable fail-safe operation enables alarm actuation on power loss in critical applications
- Wide power supply range (361A) handles more applications to reduce inventory stock
- DC power units (361A only) carry lower voltages and do not require expensive conduit for safer and easier installation
- Diode-coupled power (361A only) supports the use of redundant power supplies for critical applications
- Excellent accuracy, stability and no loose internal wiring ensure reliable alarm trips
- Operating temperature range: -13°F to 167°F (-25°C to 75°C)
- DIN rail G or T mount
- No certification/approval required
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Tech Papers
How to Use an AC Current Sensor Application NoteUsing Acromag’s AC Current Sensor Model 5020-350 Transmitters with DC current input can be used used in conjunction with an external AC Current Sensor to precondition an AC current input signal. This sensor is a highly accurate toroidal instrument transformer that converts an AC current signal to a safe, low-level, DC milliampere signal (0 to 11.17mA).... -
Specs & Data Sheets
Specs & Catalogs
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Additional information
Additional information
Weight 16 oz Dimensions 3 × 1 × 3.2 in Part Number 361A-V0-DMRN-DIN-NCR: 10 to 36V DC-power; 0 to 10V DC, 100K ohm input impedance; dual alarm, two SPDT relays, 361A-V1-SMRN-DIN-NCR: 10 to 36V DC power; 0 to 1V DC input; single alarm, one SPDT dry-contact sealed relay, 461A-V1-DMRN-1-DIN-NCR: 115V AC power; 0 to 1V DC input; dual alarm, two SPDT relays; 115V AC ± 10% power
Product Series FlatPack Series
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