Page 1
English Operating manual Safety temperature limiter STL50 Approved in accordance with: DIN EN 14597 (replacing DIN 3440) SIL 2 Company / brands of GHM www.ghm-messtechnik.de Save for later reference.
Intended use (areas of application) Refer to the chapter 'Product description' for detailed specifications for the area of application. The operational safety of the device is only assured when used as in- tended in accordance with the specifications in the operating manual. Intervention beyond the actions described in the operating manual may only be car- ried out by personnel authorised by the manufacturer for safety and warranty rea- sons.
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de 1.2 Safety instructions Read the product description before commissioning the device. Ensure that there are no limitations for use of the product for the relevant applications.
Product description The STL50 safety temperature limiter is used wherever thermal processes must be monitored and the system must be switched to a safe operating state in case of a fault. If the permissible temperature limit value is reached or an error occurs in the monitoring device (probe break, probe short-circuit, failure of a component in the device, error in the software, failure or impermissible value of the supply voltage, etc.) within the permissible temperature range, the STL50 switches off immediately.
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de Brief information Programming The device is programmed with the buttons on the front side in combination with the graphic display.
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de 2.6 Electrical installation The device may only be installed by an electrician. Compliance with the national and international regulations for installation of electrical and elec- tronic systems applicable in the respective country of use is mandatory.
Controls and functional description 3.1 Operating and display elements Pt100 STB max. 19.2 ° Limit value 20.0 ° 3.2 Operation The device is operated on 2 levels. The desired parameter is opened with the button. Selection within a parameter or adjustment of a value takes place with the buttons.
Page 10
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de The device initialises after the supply voltage is connected. The device type and software version appear in the display. After the device is finished initialising, it en- ters the operating level and the current temperature and all safety-related settings are displayed.
3.3 Operating level Note: Only the resetting of the peak value buffer is possible on the working level Display Description Process display Only Pt100 Only thermocouple STB max. STB max. Pt100 Type J Type J STB max. 19.2 ° 19.2 19.2 °...
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de Note for the display Parameter only appears with appropriate configuration Parameter only appears with appropriate device version 3.4 Configuration level...
Page 13
Display Description (entered values are factory settings) Enter password Entry of the password for the security level (0010 in condition as delivered) 0000 After an incorrect password has been entered three times, the device enters a safety timeout for 60 minutes. With the setting 0000 and active password protection, a jump to the working level takes place.
Page 15
Display Description (entered values are factory settings) Limit value Alarm value (switching point) of the pre-alarm relay Change of the value in the corresponding measuring range. 20.0 ° pre alarm Hysteresis Pre-alarm relay hysteresis Change of the value in the range 1°C (0.1°C) ... 100°C (100.0°C). °...
Page 16
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de Display Description (entered values are factory settings) Display Background lighting of the display > AUTO AUTO Lighting only goes out after only 2 min. if a button is not pressed.
3.5 Error messages Display Description Caution! The supply voltage does not reach the value that is required for the Suppl. Voltage device to function safely. too low! Please check Caution! The parameter cannot be changed, because the parameter Parameter lock is activated for the configuration level. locked activated Caution!
Page 18
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de Error messages Display Description Pt100 A cable interruption was detect at the terminals of the Pt100. Broken Check connection lines and Pt100 probes.
3.6 Functional safety The STL50 safety temperature limiter was developed according to the specifications of the IEC 61508. This standard describes the functional safety of safety-related programmable electrical and electronic systems. The devices is a Class B subsystem with the SIL2 requirement (single-channel). The safety function of the device relates to the detection and evaluation of the temperature and the resulting mandatory contact position of the installed relay.
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de 3.7 Functional test With operation of the device at a higher demand rate, e.g. with process-related frequent activation of the device, additional functional testing can be omitted in accordance with IEC 61508.
GHM Group – Martens GHM Messtechnik GmbH | Kiebitzhörn 18 | 22885 Barsbüttel | Germany info@ghm-group.de Phone +49-40-670 73-0 www.ghm-group.de Technical data Auxiliary energy Supply voltage 230 V AC ±10%, 115 V AC ±10%, 24 V AC ±15%, or 24 V DC ±15 % Power consumption <...
If you send a device back to us for inspection or repair, we must request that you strictly observe the following requirements: On the GHM homepage under: 'Downloads/forms' a return shipment form can be downloaded. The repair can be performed quickly and without call-back questions if:...
Need help?
Do you have a question about the Martens STL50 and is the answer not in the manual?
Questions and answers