Limit Alarms Series | Products

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.

Application Notes

Programmable Alarms
Analog Alarms
Various Limit Alarms

Programmable Alarms

Quad/Octad or Dual/Quad Alarm with OELdisplay
M1EA Series
- CE
- Series Guide
- Products Line up
Dual/Quad Alarm with OEL display
M2EA Series
- CE
- Series Guide
- Products Line up
Dual/Quad Alarm
AS4 Series
- CE
- UL
- Series Guide
- Products Line up

Analog Alarms

Direct Sensor Input,
SPDT plus DC Transmitter Output
AE-UNIT Series
- Series Guide
- Products Line up
Rotary switch adj.,
Direct Sensor Input, SPDT Alarm
AL-UNIT Series
- Series Guide
- Products Line up
Potentiometer Adj.,
Direct Sensor Input, SPDT Alarm
A-UNIT Series
- Series Guide
- Products Line up
Direct Sensor Input,
Various SP Control Options, SPDT Alarm
M-PAC Series
- Series Guide
- Products Line up

Various Limit Alarms

Various Limit Alarms
- CE
- UKCA
- UL
- Series Guide

Matrix Table

Quick Comparison Chart - Main Products

	OEL display		Digital Adjustments AS4 Series
	1ch / 2ch OEL display M1EA Series	OEL display M2EA Series	Digital Adjustments AS4 Series
	Series Guide Products Line up	Series Guide Products Line up	Series Guide Products Line up
Construction	Plug-in	Plug-in	Plug-in
Connection	M2.6 screw terminal	M3 screw terminal	M3.5 screw terminal
Isolation	Input to output to power	Input to output to power	Input to output to power
Dielectric Strength	1500V AC	2000V AC	2000V AC
Fixed Range	—	—	—
Range Selectability	Front buttons or PC software	Front control buttons or PC software	Front key programming
No. of Alarm Point	4, 8 / 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
Relay Form	Dual SPDT or Quad NO or NC (M1EAXV-2, 2 ch)	Dual SPDT or Quad NO or NC	Dual SPDT or Quad NO or NC
Alarm Setting	Front buttons or PC software	Front control buttons or PC software	Front key programming
Alarm Setpoint	0 - 100%	0 - 100%	0 - 100%
Deadband (Hysteresis) Adj.	FS	FS	FS
Latching Output	Yes	Yes	Yes
Setpoint Accuracy	±0.1% FS	±0.1% FS	±0.1% FS
Alarm Test	Yes	Yes	—
DC Output	—	—	—
Power Input	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)
Mounting	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)
	H 99 (3.90)^{* 1}	H 83 (3.27)	H 80 (3.15)
	D 125 (4.92)^{* 1}	D 124 (4.88)	D 132 (5.20)
Standards & Approvals	CE	CE	CE / UL / C-UL

*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
	Series Guide Products Line up	Series Guide Products Line up	Series Guide Products Line up	Series Guide Products Line up
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)				11-pin base	20-pin base
	W 72 (2.83)	W 50 (1.97)	W 50 (1.97)	W 50 (1.97)	W 80 (3.15)
	H 80 (3.15)	H 80 (3.15)	H 80 (3.15)	H 80 (3.15)	H 101 (3.98)
	D 132 (5.20)	D 132 (5.20)	D 132 (5.20)	D 132 (5.20)	D 136 (5.35)
Standards & Approvals	—	—	—	—