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MM1520
STRAIN GAUGE (BRIDGE) INPUT
DUAL LIMIT ALARM
FEATURES
 | Provides Relay Contact Closures at Preset Strain Gauge Bridge Input |
| 0.5 mV/V to 1 V/V Input Span |
| Fail-safe, Latching, and Adjustable Deadband Available |
| Red and Green LED Alarm Status Indicators |
| Unlimited* Choice of Input Ranges |
| Choice of Power Options |
| 10 + 5 Year Warranty |
DESCRIPTION
The MM1520 monitors the DC input signal from a strain gauge bridge 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 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.
The module includes filtering and conditioning to reduce susceptibility to
transients and noisy operations. It also provides a well regulated excitation
voltage for the strain gauge and a high quality differential preamplifier to
condition the low level output from the bridge.
TYPICAL APPLICATIONS
Weight and pressure control, monitoring or warning.
MOUNTING
The module is designed to plug into a standard 11-pin relay socket. Part
number MP011 is a molded plastic socket suitable for mounting on a flat surface
on 2 3/4 inch wide PVC snap track (TRK48). Use CLP-1 hold-down clip if
needed. A Killark HK Series explosion-proof housing with dome and 11-pin
socket is available (HKB-HK2D-11). A DIN rail mounted socket (P/N DMP011) is
available for 35mm symmetrical rail.
SPECIFICATIONS
INPUT SPAN
0.5 mV/V to 1
V/V
EXCITATION
adjustable 4 V to 12 V
40 mA max
load
EXCITATION STABILITY
±0.005%/°C
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
<= 500 ms
ACCURACY
±0.01% of
span
COMMON MODE REJECTION
120 dB, DC to 60
Hz
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
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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 + 30 µ V)/°C max
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
** Due to pins available, only one set of contacts are available for each
relay. Specify NO (Normally
Open) or NC (Normally Closed).
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CONNECTIONS
Power, AC L1 or DC
+
Power, AC L2 or DC
-
Input
+
Input
-
Excitation +
Excitation -
Relay Set 1 NO or NC
Relay Set 1 C
Relay Set 2 NO or NC
Relay Set 2 C
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PINS
1
3
4
5
7
8
9
10
6
2
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