Solutions for the chemical and petrochemical industries

Chemical and petrochemical industries

In the chemical and petrochemical industries, besides high reliability and product quality, processes are called for that are as energy-saving and environmentally friendly as possible. Here, the continuous recording and evaluation of all the process parameters is crucial. Reliable data transmission in the extensive systems also permits the central monitoring of all the process fields. The early integration of appropriate safety concepts in the system also minimizes the risk to humans and machinery. At the same time, it also takes economic factors into account.


Speed and frequency monitor UH 6937

• According to
- Performance Level (PL) e und category 4 to EN ISO 13849-1
- SIL-Claimed Level (SIL CL) 3 to IEC/EN 62061
- Safety Integrity Level (SIL 3) to IEC/EN 61508
- Safety Integrity Level (SIL) 3 to IEC/EN 61511
• Over-, underfrequency or window monitoring of single or
3-phase in AC systems
• Integrated user friendly frontside display
- Comfortable, menu guided configuration
- For set point and actual value of Hz
• Fast reaction time by measuring duration of cycle of input frequency
• Universal measuring inputs for AC-voltages of 8 ... 280 V for
single-phase monitoring as well as 16 ... 690 V for
single- and 3-phase monitoring
• Suitable for inverters
- Variant /0_ _ : 1 ... 700 Hz
- Variant /1_ _ : 1 ... 1200 Hz
• Adjustable hysteresis
• Adjustable reset delay function from 0 ... 100 s
• Adjustable start up time delay from 0 ... 100 s
• Adjustable alarm delay from 0.1 ... 100 s
• Manual or auto-reset
• galvanic separation between measuring input, auxiliary voltage and
output contacts
• 2-channel function
• Forcibly guided output contacts
• LED-indicators and 2 semiconductor monitoring output
• Width 45 mm
• With pluggable terminal blocks for easy exchange of devices
• Variant /_ _1:
- it is possible to set a variety of response parameters by means of a
4 bit selection facility from an overriding control unit;
- analog output (2V to 10V) corresponding to the current speed;
- the possibility of overriding the speed by a
supervisory function (muting);
- adjustable switchover time from 0 ... 100 s

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