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DC Input Field Configurable Limit Alarms
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SMLA-1 (Single Trip, DPDT, 5A) SMLA-2 (Single/Dual Trip, 2 SPDT, 5A)
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Field Configurable Input Ranges for DC Voltage and Current
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Exclusive “Dynamic Deadband” Prevents False Trips
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Provides Relay Contact Closures at a Preset DC Input Level
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Programmable HI or LO Setpoints
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Failsafe/Latching Operation
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Selectable 120/240 Vac Input Power
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View related products - Process Measurement and Control Instruments
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SMLA-1 single setpoint and SMLA-2 dual setpoint limit
alarms offer flexible, wide-ranging DC input capability.
Voltage spans from 10 mV to 200V and current spans
from 1 mA to 100 mA can be field configured. Bipolar
inputs are also accepted. Both models offer configurable
latching, failsafe and HI/LO operation. The SMLA-1
and SMLA-2 also include 0.25% to 50% adjustable
deadbands and selectable 120/240 Vac input power.
Models SMLA-1 and SMLA-2 are equipped with a dual
function diagnostic LED. The green center LED indicates
line power and input signal status. Active line power
is indicated by an illuminated LED. If the center LED
is off, check line power and the wiring connection. If
the input signal is above 100% full scale, the LED will
flash at approximately 8 Hz. Below 0%, the flash rate is
approximately 4 Hz.
The single setpoint SMLA-1 and the dual setpoint
SMLA-2 provide the following relay outputs: SMLA-1
Single Trip (DPDT, 5A); SMLA-2 Single/Dual Trip
(2 SPDT, 5A). Setpoints are top accessed multi-turn
potentiometers.
The field configurable SMLA-1 and SMLA-2 limit alarm
setpoints can be configured for HI, LO, latching or failsafe
trip operation. Non-latching HI and LO setpoints have
respective HI and LO deadbands. In a tripped condition,
the setpoint is exceeded and the appropriate red LED will
illuminate. The trip will reset only when the process falls
below the HI deadband or rises above the LO deadband.
To reset a latched setpoint the signal must be in the safe
region and the line power turned off for at least 5 seconds.
For proper deadband operation, a HI setpoint must always
be set above a LO setpoint.
In failsafe operation, the relay is energized when the
process is below the HI setpoint or above the LO setpoint
(opposite for nonfailsafe). In the failsafe mode, the relays
go to the tripped condition when the power fails.
The input must remain beyond the setpoint for
100 milliseconds, uninterrupted, to qualify as a valid
trip condition. Likewise, the input must fall outside the
deadband and remain there for 100 milliseconds to return
the alarm to an untripped condition. This effectively results
in a “dynamic deadband” - based on time - in addition to
the normal deadband.
Specifications
INPUT
Voltage Input (Unipolar or Bipolar):
Range: 10 mV, 20 mV, 50 mV, 100 mV, 200 mV, 500 mV, 1V, 2V, 5V, 10V, 20V, 50V, 100V, 200V (dip-switch selectable)
Impedance: >100 kΩ
Overvoltage: 400V max
Current Input (Unipolar or Bipolar):
Range: 1 mA, 2 mA, 5 mA, 10 mA, 20 mA, 50 mA, 100 mA
(dip-switch selectable)
Impedance: 20 Ω typical
Overcurrent: 200 mA max
Overvoltage: 60 Vdc
Common Mode (Input to Ground): 1000 Vdc max
LED Indications:
Input Range (Green):
>100% Input: 8 Hz flash
<0% Input: 4 Hz flash
Setpoint (Red):
Tripped: Solid red
Safe: Off
Limit Differential (Deadband):
>50 mV/5 mA: 0.25% to 50% of span
<50 mV/5 mA: 1% to 50% of span
Response Time:
Dynamic Deadband: Relay status will change when proper
setpoint/process condition exists uninterrupted for 100 msec
Normal Mode (Analog Filtering): <250 msec, (10 to 90%)
Setpoint:
Effectivity: Setpoints are adjustable over 100% of the
selected input span
Repeatability (Constant Temp):
>50 mV/5 mA: 0.1% of full scale
<50 mV/5 mA: 0.2% of full scale
Stability:
Line Voltage: ±0.01%/% max
Temperature: ±0.05% of full scale/°C max
Common Mode Rejection: DC to 60 Hz: 120 dB
Isolation: 1000 Vdc between contacts, input and power
ESD Susceptibility: Meets IEC 801-2, Level 2 (4 KV)
Humidity:
Operating: 15 to 95 %RH @ 45°C (113°F)
Soak: 90 %RH for 24 hours @ 65°C (149°F)
Temperature Range:
Operating: 0 to 60°C (32 to 140°F)
Storage: -15 to 70°C (5 to 158°F)
Power: 120/240 Vac ± 10%, 50 to 60 Hz selectable, 2 W typical, 5 W max
Relay Contacts:
SMLA-1: DPDT (2 Form C)
SMLA-2: 1 SPDT (1 Form C) per setpoint
Current Rating (Resistive): 120 Vac: 5A; 240 Vac: 2A;
28 Vdc: 5A (external relay contact protection is required for use with inductive loads)
Material: Silver-Cadmium Oxide
Electrical Life: 105 operations at rated load
Mechanical Life: 107 operations
Latch Reset Time: 5 seconds
Weight:
SMLA-1: 209 g (0.46 lb)
SMLA-2: 282 g (0.62 lb)
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† All dollar amounts on this site are shown in US currency.
Note: Comes complete with operator’s manual.
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