Hf-scientific MicroTOL Online Turbidimeter Manual de usuario descargar pdf (Pagina 34)

MICRO TOL (5/10) 28

Rev. 4.8

• The same attention character “:” in ASCII or 3A Hex

• The address of the Micro TOL

• The Reading

• The Unit (NTU)

A sample communication would look like this:

(Master computer requesting a report from address #1) : 1 CRLF

(Micro TOL set to address #1 Response) :001 0.0249 NTU

8.3.3 Modbus Communication

Modbus protocol communication is operational on all models. The Modbus information is

covered in a separate manual (Catalog # 19777). This manual is also available as a free

download from our website at www.hfscientific.com.

8.4 Flow Alarm (Catalog # 19945A)

The flow switch for the Micro TOL is a factory-installed option. This option indicates a

“Low Flow” condition by switching both relays to the fail state and setting the 4-20 mA

signal to 2 mA. There is also a screen indication of the low flow condition and a modbus

8.5 Flow Controller (Catalog # 19778)

The flow controller limits the flow, in high-pressure systems, to safe flow limits of less

than 1 liter/minute.

8.6 Remote Panel Meter (Catalog # 19609)

The remote panel meter allows for remote indication of the NTU reading using the 4-20

mA loop. No external power is required as the meter is run off of the 4-20 mA source.

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Hf-scientific MicroTOL Online Turbidimeter Manual de usuario Pagina 34