GHM Martens TV125M User manual

Operating Manual
Universal Isolating Amplifier
TV125M / ST125M
EN
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Universal isolating amplifier TV125M / ST125M
Table of contents
Intended use (areas of application).................................................................................................................1
1.1 Safety signs and symbols...................................................................................................................................2
1.2 Safety instructions ..............................................................................................................................................3
1.3 Product liability and warranty..............................................................................................................................3
1.4 Standards and directives ....................................................................................................................................3
Product description..........................................................................................................................................4
2.1 Scope of Delivery................................................................................................................................................4
2.2 Principle of operation..........................................................................................................................................4
2.3 Layout of the measuring system.........................................................................................................................5
2.4 Block circuit diagram...........................................................................................................................................6
2.5 Type Label..........................................................................................................................................................7
2.6 Power Rail ..........................................................................................................................................................8
Assembly and installation................................................................................................................................9
3.1 Mechanical assembly .........................................................................................................................................9
3.2 Electrical Installation...........................................................................................................................................9
3.3 Connection Diagram.........................................................................................................................................10
Operating steps, functional description, output..........................................................................................11
4.1 Operating steps, functional description.............................................................................................................11
4.2 Status-LED .......................................................................................................................................................13
4.3 Output...............................................................................................................................................................13
4.4 Transmitter power supply (ST125, only)...........................................................................................................13
Commissioning, Maintenance and Service..................................................................................................14
5.1 Commissioning.................................................................................................................................................14
5.2 Maintenance.....................................................................................................................................................14
5.3 Service..............................................................................................................................................................14
5.4 Error and System Messages.............................................................................................................................15
Technical Data ................................................................................................................................................16
6.1 Safety-related key values .................................................................................................................................17
6.2 Mechanical design / dimensions.......................................................................................................................19
Accessories and replacement.......................................................................................................................20
Order Code......................................................................................................................................................20
Device transport and storage........................................................................................................................21
Returns............................................................................................................................................................21
Disposal...........................................................................................................................................................21
Service.............................................................................................................................................................22
12.1 Manufacturer.....................................................................................................................................................22
12.2 Repairs processing...........................................................................................................................................22
Certificate of Conformity................................................................................................................................23

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Universal isolating amplifier TV125M / ST125M
Intended use (areas of application)
Refer to the chapter 2 Product description for detailed specifications for the area of application. The operational
safety of the device is only assured when used as intended in accordance with the specifications in the operating
manual. Intervention beyond the actions described in the operating manual may only be carried out by personnel
authorised by the manufacturer for safety and warranty reasons.
Conversions or modifications made on one's own authority are expressly prohibited.
Application-specific dangers can emanate from this device when used improperly or not as intended.
The device is not intended for use in explosion-prone areas and safety-related system parts in accordance with
SIL.
Only device versions TV125M-Ex, TV125MP-Ex, ST125M-Ex and ST125MP-Ex are permitted for use as
operating equipment for connection of intrinsically safe sensors, installed in Zones 0 or 1 and/or 20 or 21.
All safety-relevant characteristic data must be observed in this connection. (see 6.1 Safety-related key values)
The approval for all intrinsically safe operating equipment is voided if it has been previously connected to non-
intrinsically safe power circuit,because compliance with the safety-relevant characteristic data cannot be 100%
guaranteed there.
Therefore, a safety test must be conducted by the manufacturer before
later use as an intrinsically safe operating device.
The device TV125MP-00, ST125MP-00 and all other versions of the
series TV****-Ex and ST****-Ex can be installed in the explosion-prone
Zone 2 under the following conditions:
Installation in a clean environment in a conductive, earthed housing (switch cabinet) with a minimum
protection rating of IP54.
Disconnection of connecting terminals only takes place in the de-energised state
Standards:: EN 60079-0 und EN 60079-7
General safety instructions, use
This operating manual must be kept in a location such that qualified personnel can refer to it at all times. Any
processes described in this operating manual may only be carried out by trained, qualified personnel
who are authorised by the owner and wearing protective clothing. All rights reserved.
DANGER
DANGER
DANGER

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Universal isolating amplifier TV125M / ST125M
1.1 Safety signs and symbols
Warning notices are identified in this document as described under Table 1 Safety sings and symbols:
Table 1 Safety sings and symbols
DANGER
Warning! This symbol warns of imminent danger which can result in death, severe bodily
injury, or severe property damage in case of non-observance.
Attention! This symbol warns of potential dangers or harmful situations which can cause
damage to the device or to the environment in case of non-observance.
Note! This symbol indicates processes which can have a direct influence on operation or can
trigger an unforeseen reaction in case of non-observance.

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Universal isolating amplifier TV125M / ST125M
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. The owner is responsible for ensuring the fault-free operation of the
device. The owner is obligated to ensure compliance and to observe the required work and safety measures of
the current applicable regulations for the entire duration of use.
1.3 Product liability and warranty
Exclusion of liability:
The contents of the operating manual have been checked to ensure conformity with the described device.
However, deviations cannot be entirely ruled out. Therefore, we cannot assume any guarantee for complete
conformity. The specifications in this document are checked regularly and any necessary corrections are
incorporated into subsequent versions. This document is subject to technical changes. In addition, all
claims are based on the valid 'Standard Terms for the Supplyof Products and Services of theElectrical Industry'.
GHM Messtechnik cannot inspect or repair any devices without the required form having been filled in
completely (see 10 Returns).
1.4 Standards and directives
Conformity with Directive 2014/30/EU
CE-Conformity EN 61326-1:2013, group 1, class A
EN 61326-3-1:2017.
Warning:
This device is not intended to be used in residential areas and cannot ensure
adequate protection of radio reception in such environments.
Conformity with Directive 2014/35/EU
Testing standards EN 61010-1:2010 + A1:2019 + A1:2019/AC:2019
Conformity with Directive 2014/34/EU
Testing standards EN 60079-0:2018
EN 60079-7:2015
EN 60079-11:2012
Functional safety
Testing standards EN 61508-1…5: 2011
SN 29500:2013
DANGER

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Universal isolating amplifier TV125M / ST125M
Product description
Isolating amplifiers of the series TV/ST125 are suitable for potential isolation and for conversion of unit
signals - optionally in explosion-prone environments. The universal configuration of the input, output and
internal power supply by means of a wide-range mains adapter limits the number of models to a few versions.
The auxiliary voltage supply can be optionally provided by means of a mounting rail bus connector.
The input measuring range can be switched between
0…20 mA and 4..20 mA and/or
0…10 V and 2...10 V
on the front side via a DIP switch.
The output measuring range can be configured between
0...20 mA and 4..20 mA and/or
0..10 V and 2..10 V
on the front side via a DIP switch.
With the microprocessor-controlled measurement recording, undercutting and exceeding of measuring
ranges are detected and communicated via a two-colour status LED on the front side. Then the output is set
to a defined starting value and/or end value.
The starting value and the end value of the measuring range can be adjusted with the two trimmers on the
front side.
The device version ST125 provides an additional transmitter feed for external 2, 3- wire sensors.
The devices can also be used in the explosion-prone Zone 2 if they are installed in a suitable housing.
Use in systems with functional safety SIL2 is also possible.
2.1 Scope of Delivery
- TV125M or ST125M, according to ordering code
- Power Rail DIN rail adapter (available for LP version, only)
- this operating manual
- further document if applicable
2.2 Principle of operation
The input signals are amplified in the input stage, the amplitudes are limited and the band is limited with an
analogue filter of the third order. The filtered signal is digitalised by the analogue-digital converter of the
microprocessor with a resolution of 14 bits. After scaling and a measuring range check, the signal is
transmitted by means of pulse width modulation via an optocoupler to the output stage.
The output stage converts the PWM signal to a proportional analogue value which is then output via the
output. The output current and/or output voltage are limited to a defined starting value and/or end value.
The three circuits: Input, output and auxiliary voltage are galvanically isolated with amplified isolation.

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Universal isolating amplifier TV125M / ST125M
2.3 Layout of the measuring system
①
Terminals for auxiliary voltage
②
Terminals for current output
③
Type plate / connection diagram
④
Status-LED
⑤
Trimmer for end value adjustment
⑥
DIP-switches for configuration of in / output
⑦
Trimmer for starting value adjustment
⑧
Terminals for transmitter power supply
(ST125M, only)
⑨
Terminals for analogue output
Figure 1 Isolating amplifier
TV125M

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Universal isolating amplifier TV125M / ST125M
2.4 Block circuit diagram
Figure 2 Block circuit diagram

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Universal isolating amplifier TV125M / ST125M
2.5 Type Label
The type plate contains the most important identification data:
- Connection diagram
- Manufacturer
- Type and article description
- Technical specifications
- Serial number / barcode
Figure 3 Type Plate

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Universal isolating amplifier TV125M / ST125M
Figure 4 Example: TV125MP with DIN rail connector and supply terminal PRVK
(optional accessories)
Figure 5 Terminal assignment PRVK
2.6 Power Rail
The supply of multiple devices can be combined and simplified via a bus system in the carrier rail (TS35).
A corresponding version is available for the entire LP series of GHM carrier rail devices in a housing with 12.5
mm width.
A bus adapter compatible with series connection is clamped on the carrier rail before installation of the device
to be supplied with power. An adapter is required for each device. The bus power supply is provided via a plug-
type terminal strip PRVK.
The power supply terminals 11 and 12 on the upper device side are omitted in device version ST/TV125MP
designed for this purpose.