WILKERSON INSTRUMENT CO., INC.

MM1420 RTD Input Plug-In Dual Alarm
Mighty Module

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MM1420

MM1420
RTD Input
Plug-In
Dual Alarm

Mighty Module

$395.00

The following information must be entered to complete your order:
See "Specifications" below for Input range limits.

Power:

Input:
Zero Scale
Full Scale
Units
  RTD Element Type
Alarms: Alarm Action
  Alarm Logic
  Header

Quantity:

 

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Specifications
 
  • Features
  • Description
  • Specifications
  • Dimensions
  • Connections
  • Provides Relay Contact Closures at Preset RTD Input
  • 3-Wire or 2-Wire, 10 ohms to 2000 ohms RTDs
  • Fail-Safe, Latching and Adjustable Deadband Available
  • Red and Green LED Alarm Status Indicators
  • Unlimited Choice of Input Ranges ( Within specified range limits )
  • Upscale Burnout Protection
  • Choice of Power Options
  • 10 Year Warranty

The MM1420 monitors an RTD input signal and provides two sets of spdt, 5 A alarm relays with two independently adjustable setpoints. Each setpoint has a set of red/green LEDs to indicate alarm status. When the input is between the setpoints, the relays are normally deenergized. When the signal exceeds a particular setpoint, the relay becomes energized. To provide a fail-safe operation (loss of power resulting in an alarm state), select Option R. The module can be supplied as a HI/HI, HI/LO, or LO/LO alarm (HI/LO supplied if not specified).

Standard deadband on both alarms is fixed at 0.5% of span (Option A provides adjustable deadband of 0.5% to 100% of span.) Option D, latching alarms, has no deadband control. Once the limit has been reached, the alarm latches and power to the module must be momentarily interrupted to reset the alarm.

All Wilkerson products are designed with RFI filters and lightning protection to reduce susceptibility to electrical noise and damage by lightning.

TYPICAL APPLICATIONS
Temperature control, monitoring or warning for HVAC, pumps, motors, etc

RTD INPUT
3-Wire or 2-Wire, 10 ohms to 2000 ohms

INPUT RANGE
select any range within RTD limit [min span 25°F/14°C (100°F/55°C with 10 ohms RTD)]

EXCITATION CURRENT

RTD Current
10 ohms
100 ohms
1000 ohms
2000 ohms
10 mA
5 mA
0.5 mA
0.2 mA

SETPOINT
0 to 100% of span

DEADBAND
Standard fixed 0.5% of span
(Option A) 0.5% to 100% of span
(Option D) Latching. Interrupt power to reset.

OPEN SENSOR OUTPUT
> full scale

ACCURACY
±0.1% of span or 0.02 ohms, whichever is greater

COMMON MODE REJECTION
120 dB, DC to 60 Hz

RELAY CONTACTS (spdt)
Resistive Load 5 A max, 150 W max, 220 VAC max, 30 VDC max
Inductive Load (Power Factor > 0.4) 2.5 A max, 75 W max, 220 VAC max, 30 VDC max

TRANSISTOR OUTPUT
(Option V)
relay driver (12V coil, >220 ohms) or open-collector outputs sink 100 mA, 30 V supply max

OPERATING TEMPERATURE
14°F to 140°F/–10°C to 60°C

TEMPERATURE STABILITY
±0.02% of span or 0.025°C/°C, whichever is greater

POWER
115 VAC ±10%, 50/60 Hz (2.5 W max)
230 VAC ±10%, 50/60 Hz (2.5 W max)
(DC Power Option)
24 VDC (limits 21-32 VDC)
12 VDC (limits 10-16 VDC)

Isolation, DC power supply to input common: 10 megohms

Mighty Module Dimension Drawing

11 Pin Header (Option E) 20 Pin Header
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
PIN 9
PIN 10
PIN 11
Power AC L1 or DC +
RTD Compensating Lead
Power AC L2 or DC -
RTD
RTD
Relay 1 NO
Relay 1 C
Relay 1 NC
Relay 2 NO
Relay 2 C
Relay 2 NC
PIN 1
PIN 3
PIN 9
PIN 11
PIN 13
PIN 14
PIN 15
PIN 17
PIN 18
PIN 19
PIN 20
Power AC L1 or DC +
Power AC L2 or DC -
RTD
RTD
Relay 1 NO
Relay 1 C
Relay 1 NC
Relay 2 NO
Relay 2 C
Relay 2 NC
RTD Compensating Lead
Specifications    Manual

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