ORP-TRA-600

ORP-TRA-600 online ORP transmitter is an accurate instrument used for industrial on-line PH measurement and PH controlling. The instrument is easy to install and use, operates safely, has a strong adaptability to the environment, and requires little maintenance. It widely used for the water treatment environmental protection, industrial waste water, chemical industry etc. The instrument has the following main characteristics: 1) Display measuring ORP value.. 2) High and Low limit relay control output, 3) Isolated 4-20mA current signal output or RS485 output.

Product Details

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Product Details

Major Technical Specifications

Measurement range	-1000mV ～ +1000mV
Resolution ratio	0.2 mV
Accuracy	±0.2 mV
Displaying mode	3½ LCD
Calibrating mode	One-point calibration (automatic identification of solutions)
Manual temperature compensation	0～120℃
Compression resistance of electrodes	0～0.5MPa
Measurement distance	standard configuration 5m(≤40m)
Flow Velocity	≤3m/s
Pressure	≤0.4Mpa
Output	4-20mA current or Modbus RS485 (optional)
Control output	Maxi. and Mini. (constantly open) contact point
Capacity of contact points	3A/AC250V (with resistant loads)
Power supply	DC-24V ，0.5A □; (Standard) DC-12V ，0.5A □; (Optional)
Environmental conditions	Humidity: ≤85%/RH; Temp.: 0～50℃
External dimensions	927659mm (H x W x D) Installation mode: DIN Installation

Wire Connection Details

Note: The standard version is a two-wire ORP electrode

A Terminals:

No.	Terminal	Terminal Content
1	HI	Constantly open high limit relay alarm output
2	COM	Relay common terminal
3	LO	Constantly open low limit relay alarm output
4	NC	Empty
5	NC	Empty
6	INPUT	ORP electrode signal input( Transparent wire)
7	REF	ORP electrode signal ground wire( Black)
8	TEMP	Empty
9	TEMP	Empty

B Terminals

No.	Terminal	Terminal Content
1	DC 24+	Power input +
2	GND	Equipment Ground wire
3	DC 24-	Power input -
4	NC	Empty
5	485G	RS 485 Signal Ground wire
6	A	RS485 Signal A
7	B	RS485 Signal B
8	MA+	4-20mA current signal output +
9	MA-	4-20mA current signal output -

Operation Of The Instrument

4.1 Soft key function

Soft key	Key function	Function description
	Menu Key	Under Measuring status, Enter or exit related parameter “setting Menu”
	Right shift key	Right Shift to select the digit of the parameter（Number flashes When selected）; Up shift to browse Menu.
	Add shift key	Change the selected parameter digital value and parameter shift
	Confirm key	Confirm to select and enter into Menu and parameter save,

4.2. Operation of the instrument

Under main interface，Press“ ”key to Menu interface ， the detailed description as follows:

No.	Menu	Menu Content
1	Un-T	Measuring Unit: pH/mV shift to display
2	T--C	Temp Compensate Interface: (ORP can’t work)
3	HC--	Relay high limit close value
4	HO--	Relay high limit open value
5	LC--	Relay low limit close value
6	LO--	Relay low limit open value
7	DE--	delay x second alarm
8	4--A	4mA corresponding PH value
9	20-A	20mA corresponding PH value
10	ADD-	RS-485 Address, default value 002
11	BAUD	RS-485 Baud Speed, default value 9600
12	CAL-	ORP Calibration Menu
13	FAC 0	Restore factory settings for user
14	FAC -	Factory setting Menu, only for factory

Note:After having set an option, you must press the button to save the data.

Calibration Of Instruments

The calibration takes the form of one-point calibration. The automatic calibration protection function work in the process of calibration, illegal calibration is not executed.

Before the calibration starts,make sure that you have compounded, the default calibration standard is 240mV, this value can be changed. Before the calibration starts, the electrodes must be submerged and activated in clean water or the measured solution for 5 minutes.

The calibration methods are as follows: when it is the in the measuring state,

Press the button and until the instrument display “CAL” , and it enters the calibrating state.

Press the button , and the instrument will display “240mV” . Put the cleaned electrodes into the “240mV” buffer solution,

press the button , the controller display current buffer solution “240mV” value, when ORP value stable, and wait 3 to 5 minutes, press the button to save.

l During calibration, if the controller display “ ERR” , which indicate calibration failure, need to re-calibrate, if more times calibration failure, pls change the ORP electrode, or contact with the supplier.

Installation Of Measuring Electrodes

The measuring electrodes are compound electrodes with plastic shells and 3/4 ＂ NPT threaded joints, Please install strictly according to the following diagrams:

3/4＂BSP threaded joints.

Points for attention:

1) The electrodes shall be installed where the flow speed is steady and air bubs seldom gather or backwater which may lead to the inaccuracy.

2) The electrode shall be submerged deep into flowing water.

3)The cable collecting PH signals which is a form of weak potential signals shall be separately wired and shall not share a protective pipe with power supply wires and control wires, so as to avoid interference.

Measuring electrodes maintenance:

1) Avoid putting the electrodes in the dry air. When the electrodes are not in use, clean them with water and then put them back into the liquid- containing case with 1 mol KCL,or put the electrodes into a container with 1 mol KCL in it.

2) The electrodes shall be cleaned regularly. If the glass bulbs of the electrodes and Polytetrafluoroethylene (PTFE) are contacted and polluted, clean them with the following agents:

① use surface active agent to get rid of grease or greasy things.

② use 10% hydrochloric acid solution to get rid of calcium precipitates or metal hydroxides.

③ use 10% hydrochloric acid solution to get rid of sulphide precipitates. Use the mixture of 10% hydrochloric acid solution and pepsins to get rid of protein adhesives.

Maintenance Of Instrument

1) The measuring electrodes are accurate parts and shall not be taken out of the measuring room unless it is necessary to do so.The ORP electrode shall be cleaned Regularly.

2) Measuring cables are special cables which shall not be replaced by other types of cables. Unqualified cables may cause big errors.

3) If the measuring electrodes are damaged or losing efficacy, Purchas and replace them with the same type of ORP electrodes, and calibrate them according to the fifth chapter of this manual.

4) The instrument is composed of accurate integrated circuits and electronic components and therefore shall be protected from humidity.

The Instrument As A Whole Set