Limit Alarms

Monitoring measurement signals and outputting alarm contact signals.

Fail-safe and non-failsafe alarms are available from DIN-rail mount devices to front-of-panel displays offering up to four contact relays. These alarms feature digital setpoint controls, delay timers, and universal inputs. Our alarm series products are used from simple on/off pump control to back-up alarm systems in the event of a PLC/DCS failure.

Programmable Alarms

Analog Alarms

Various Limit Alarms

Matrix Table

Quick Comparison Chart - Main Products

  • Programmable Alarms
  • Analog Alarms
OEL display Digital Adjustments
AS4 Series
LCD display
M7E-UNIT Series
1ch / 2ch OEL display
M1EA Series
OEL display
M2EA Series
Construction Plug-in Plug-in Plug-in Plug-in
Connection M2.6 screw terminal M3 screw terminal M3.5 screw terminal M3 screw terminal
Isolation Input to output to power Input to output to power Input to output to power Input to output to power
Dielectric Strength 1500V AC 2000V AC 2000V AC 2000V AC
Fixed Range
Range
Selectability
Front buttons or
PC software
Front control buttons
or PC software
Front key programming Front control buttons or
PC software
No. of Alarm Point 4, 8 / 2, 4 2, 4 2, 4 2, 4
Relay Form Quad SPDT or Octad NO or NC
(M1EAXV-1, 1 ch)
Dual SPDT or
Quad NO or NC
Dual SPDT or
Quad NO or NC
Dual SPDT or
Quad NO or NC
Dual SPDT or Quad NO or NC
(M1EAXV-2, 2 ch)
Alarm Setting Front buttons or
PC software
Front control buttons or
PC software
Front key programming Front control buttons or
PC software
Alarm Setpoint 0 – 100% 0 – 100% 0 – 100% 0 – 100%
Deadband
(Hysteresis)Adj.
FS FS FS FS
Latching Output Yes Yes Yes Yes
Setpoint Accuracy ±0.1% FS ±0.1% FS ±0.1% FS ±0.1% FS
Alarm Test Yes Yes Yes
DC Output
Power Input AC / DC AC / DC AC / DC AC / DC
Operating
Temperature
-5 to +55°C
(23 to 131°F)
-5 to +55°C
(23 to 131°F)
-5 to +55°C
(23 to 131°F)
-5 to +55°C
(23 to 131°F)
Mounting Surface or DIN rail Surface or DIN rail Surface or DIN rail Surface or DIN rail
Size
mm (inch)
W 36 (1.42) W 29.5 (1.16) W 50 (1.97) W 29.5 (1.16)
H 99 (3.90)* 1 H 83 (3.27) H 80 (3.15) H 83 (3.27)
D 125 (4.92)* 1 D 124 (4.88) D 132 (5.20) D 124 (4.88)
Standards
& Approvals
CE CE CE / UL / C-UL CE

* 1. With the base (Model: M1E-BS2) installed.

Thumbwheel Switch Adjustments Rotary Switch / Potentiometer / Various Setpoint Adjustments
Extra DC Output
AE-UNIT Series
Rotary Switch Adj.
AL-UNIT Series
Potentiometer Adj.
A-UNIT Series
Three-turn screwdrivers,
Remote dial potentiometer or DC input
M-PAC Series
Construction Plug-in Plug-in Plug-in Plug-in
Connection M3.5 screw terminal M3.5 screw terminal M3.5 screw terminal M3.5 screw terminal
Isolation Input to DC output to relay output to power Input to output to power Input to output to power Input to output to power
Dielectric Strength 2000V AC 2000V AC 2000V AC 1000V AC
Fixed Range Specified when ordering Specified when ordering Specified when ordering Specified when ordering
Range
Selectability
No. of Alarm Point 2 2 2 1 or 2
Relay Form SPDT SPDT SPDT SPDT or DPDT
Alarm Setting Thumbwheel switches 10-position rotary switches 270°-turn screwdrivers Three-turn screwdrivers,
Remote dial potentiometer or DC input
Alarm Setpoint 0 99% 0 99% 0 100% 0 100%
Deadband
(Hysteresis) Adj.
9% 1 100% 1 100%
Latching Output Yes
Setpoint Accuracy ±0.5% ±0.5% ±0.5% ±0.2%
Alarm Test
DC Output Yes Optional
Power Input AC / DC AC / DC AC / DC AC / DC
Operating
Temperature
-5 to +55°C (23 to 131°F) -5 to +60°C (23 to 140°F) -5 to +60°C (23 to 140°F) -5 to +60°C (23 to 140°F)
Mounting Surface or DIN rail Surface or DIN rail Surface or DIN rail Surface
(DIN rail available for 11-pin base)
Size
mm (inch)
W 72 (2.83) W 50 (1.97) W 50 (1.97) W 50 (1.97)
H 80 (3.15) H 80 (3.15) H 80 (3.15) H 80 (3.15)
D 132 (5.20) D 132 (5.20) D 132 (5.20) D 132 (5.20)
Standards
& Approvals