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MM1420
RTD INPUT
DUAL LIMIT ALARM
FEATURES
 | Provides Relay Contact Closures at a 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 |
| Upscale Burnout Protection |
| Choice of Power Options |
| 10 + 5 Year Warranty |
DESCRIPTION
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 de-energized. 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 RR. The module can be
supplied as a HI/HI, HI/LO, or LO/LO alarm (HI/LO supplied if not specified).
Standard deadband 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.
The module includes filtering and conditioning to reduce susceptibility to
transients and noisy operations.
TYPICAL APPLICATIONS
Temperature control, monitoring or warning for HVAC, pumps, motors, etc.
MOUNTING
The module is designed to plug into a standard 20-pin relay socket (part number
MP020). Option E uses an 11-pin socket (part number MP011). The sockets
are molded plastic suitable for mounting on a flat surface. The MP011 will mount
in a 2 3/4 inch wide PVC snap track (TRK48). Use CLP-1 hold-down clip with
MM1420 Option E (11-pin). No clip is available for 20-pin modules. Killark
HK Series explosion-proof housings are available with 11-pin sockets.
(They cannot be provided with 20-pin sockets.) Order HKB-HK2D-11 (standard dome)
for use with MM1420 Option E. An 11-pin DIN rail mounted socket (P/N
DMP011) is available for 35mm symmetrical rail.
SPECIFICATIONS
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
10 ohms
100 ohms
1000 ohms
2000 ohms
|
10 mA
5 mA
0.5 mA
0.2 mA
|
SETPOINT
Each alarm
0 to 100% of span
DEADBAND
Standard
Fixed 0.5% of span
(Option
A)
0.5% to 100% of
span
RESPONSE TIME
20 ms
typical
WR < = 200 ms
(range
dependent)
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
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RELAY
CONTACTS
2 (spdt)
Resistive Load:
5 A max, 150 W max
220 VAC max, 30 VDC max
Inductive Load
1/8 HP max at 120/240 VAC
TRANSISTOR OUTPUT (Option V)
Relay driver
(12 V coil, > = 220 ohms)
or open-collector outputs
sink 100 mA, 30 V supply max
LINEARITY (Option
T)
±0.01% of
span
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)
Isolation, DC power supply to
input common
10 megohms
* Within specified range limits
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CONNECTIONS
Power, AC L1 or DC
+
Power, AC L2 or DC
-
RTD +
RTD -
RTD Compensating Lead
Relay 1
NO
Relay 1
C
Relay 1
NC
Relay 2
NO
Relay 2
C
Relay 2
NC
|
20
PIN
1
3
11
9
20
13
14
15
17
18
19 |
11PIN (Option E)
1
3
4
5
2
6
7
8
9
10
11
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