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Safety and Monitoring Devices

A range of safety relays for monitoring your process parameters

STL4896 picture
Safety Temperature Limiter Safety-TL4896

The STL4896 safety temperature limiter is used where ever thermal processes must be monitored and the system must be transferred into a safe operational state in case of fault. If the permissible temperature limit value is reached,or if a fault occurs
within the permissible temperature range on the monitoring equipment (sensor open, sensor short-circuit, failure of a component part in the device, fault in the software, failure or inadmissible value of the supply voltage etc.), the STL4896 switches off without delay. The alarm contact is activated, the
LED ALARM on the front panel and the back-lighting of the display
light up, and the error cause is indicated as plain text on the display. In addition, there is a 24 V DC signal present on the terminals 16-17 for an external alarm signal.
Alternatively, the device can be reset using an external contact. In
addition, the STL4896 has an programmable analog output with up
or downscaling function, as well as a precontact.

Features:

MR50 picture
MR50 Monitoring Relay

The Monitoring Relay MR50 has inputs for industry standard signals 0/4 ... 20 mA and 0/2 ... 10 V DC. Measuring value and programmed unit are shown in the display.
The integrated transmitter supply offers direct connection of loop powered sensors.
Simple programming, up to 4 alarm outputs (SPDT) and optional available fully isolated freely programmable analog output 0/4 ... 20 mA; 0/2 ... 10 V DC meets the demands of different applications.
Peak value indication for minimum and maximum measured values are stored in the background and can be read out from the display at any time.

Features:


Measuring input:
 Standard signals
0/2..10 V DC, 0/4..20 mA, transmitter supply

GS125 picture
GS125 Monitoring Relay

Limit value switches of the series GS125 are used in switch cabinets for process monitoring or for simple process regulation.
Both temperatures and derived variables such as voltage, current
and resistance are used as control signals. In the process, 1 or 2 limit values can be monitored.
The universal configurability of the measuring inputs reduces the
stock requirement for various applications.
The housing width of only 12.5mm enables space-saving installation in the switch cabinet.
The scales for the limit value setting, illuminated red or green
depending on the switch status, also enable operating in dark environments.
For assignment of the measuring unit to the scale labelling, 24
transparent adhesive labels are supplied. They can be glued between the adjusting wheels on the front panel.

Features:


Measuring input:
 Standard signals
0/2..10 V, Ri ca. 20 kΩ, 0/4..20 mA, Ri ca. 60 Ω, Pt100 linearised,
measuring current ~1,6 mA relay deenergize at sensor twist-off or short circuit

PMT50-2-3 picture
PMT50-2-3 Temperature Transmitter & Monitor

The programmable universal transmitter PMT50 operates with analog input signals.
The device converts input signals to analog output 0/4..20 mA;
0/2..10 VDC.
Optionally a serial interface is available.
The device offers a linearisation function for any sensor curves and a simulator function.
The integrated transmitter supply 24 V DC max. 30 mA allows the feeding of 2-and 3-wire sensors. 4 alarm outputs for monitoring and controlling are available.

Features:

STL50 picture
STL50 Safety Temperature Limiter

The STL50 safety temperature limiter is used where ever thermal
processes must be monitored and the system must be transferred
into a safe operational state in case of fault. If the permissible temperature limit value is reached, or if a fault occurs within the
permissible temperature range on the monitoring equipment (sensor open,sensor short-circuit, failure of a component part in
the device, fault in the software, failure or inadmissible value of
the supply voltage etc.), the STL50 switches off without delay.
The alarm contact is activated, the LED ALARM on the front panel
and the back-lighting of the display light up, and the error cause is
indicated as plain text on the display.
In addition, there is a 24V DC signal present on the terminals16-17 for an external alarm signal. Alternatively, the device can be reset
using an external contact. In addition, the STL50 optionally has an programmable analog output with up or downscaling function, as well as a precontact.

Features:


Measuring input:
 Pt100, Fe-CuNi, NiCr-Ni, NiCrSi-NiSi, Pt10Rh-Pt

TB225 picture
TB225 Safety Temperature Limiter

The temperature limiter TB225 is used for applications where
thermal processes must be monitored and the system must
be switched to a safe operating state in the case of a fault. The
device has universal inputs for the connection of dual
thermocouples,Pt100 sensors, and input signals (0/4..20mA or
0/2..10V). The safety function is provided by means of the main
relay with configurable threshold. An additional relay with an
independently adjustable threshold is provided for additional
signalling. The TB225 also offers an analog output which can be
freely defined within the measuring range of the temperature input.
The resetting of the device in the operating mode as a temperature
limiter can take place via the buttons on the front, the integrated
graphic display, or using an external switch or external voltage. The
TB225 has safe 3-way electrical isolation between input, output,
and auxiliary voltage.

Features:


Measuring input: Pt100, Fe-CuNi, NiCr-Ni, NiCrSi-NiSi, Pt10Rh-Pt