K-Patents PR-23 User Manual

PROCESS INSTRUMENTS

PROCESS

REFRACTOMETER

PR-23

INSTRUCTION

MANUAL

IM-EN-PR23 Rev. 1.87

Protected by one or more of the following U.S. patents:

Patent No. 4,571,075

Patent No. 5,563,737

Patent No. 5,009,113

Patent No. 5,617,201

Patent No. 5,309,288

Patent No. 6,067,151

INSTRUCTION MANUAL

FOR INLINE REFRACTOMETER

PR-23(-...-AX/FM/CS/IA/IF)

WARNING

The process medium may be hot or otherwise hazardous.

Precautions when removing the sensor from the process line:

Make positively sure that the process line is not under pressure. Open a vent valve to the atmosphere. For a prism wash system, close a hand valve for the wash medium and disable the wash valve. Loosen the clamp cautiously, be prepared to tighten again.

Be out of the way of any possible splash and ensure the possibility of escape. Use shields and protective clothing adequate for the process medium.

Do not rely on avoidance of contact with the process medium.

After removal of the sensor, it may be necessary to mount a blind cover for security reasons.

Document/Revision No. IM-EN-PR23: Rev. 1.87

Effective: April 1, 2015

This product manual is delivered to the end user with a K-Patents product.

Information in this manual is subject to change without notice. When the manual is changed, a revised copy is published at http://www.kpatents.com/.

THE PASSWORD FOR PR-23 IS 7 8 4 5 1 2.

K-PATENTS OY	K-PATENTS OY	K-PATENTS, INC.	K-PATENTS
Postal address:	Street address:	1804 Centre Point Circle,	(Shanghai) Co., Ltd
P.O. Box 77	Elannontie 5	Suite 106,	Room 1509, Tomson Com-
FI-01511 Vantaa, Finland	FI-01510 Vantaa, Finland	Naperville, IL 60563	mercial Building, No. 710,
Tel. + 358 207 291 570		Tel. [phone]	Dongfang RD, Pudong
Fax [phone]		Fax [phone]	District, Shanghai, China
[e-mail]		[e-mail]	Tel. [phone]/0598
http://www.kpatents.com/		http://www.kpatents.com/	Fax [phone]
			http://www.kpatents.com/

Table of contents

1	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		1
	1.1	PR-23 refractometer models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1
	1.2	Principle of measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
	1.3	General safety considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
	1.4	Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
	1.5	Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
2	Inline refractometer sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		5
	2.1	Sensor description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	2.2	Mounting the sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	2.2.1	Choosing sensor mounting location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	2.2.2	PR-23 mounting guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	2.2.3	Check list for pipe mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
	2.2.4	Check list for mounting in a tank, a vessel or a large pipe . . . . . . . . . . . . .	8
3	Indicating transmitter DTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		9
	3.1	Indicating transmitter description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	3.2	Mounting Indicating transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	3.3	Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	3.3.1	Interconnecting cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	3.3.2	Connecting sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	3.3.3	Connecting the Indicating transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	3.3.4	Power terminals for AC power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
	3.3.5	Power terminals for 24V DC power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
	3.3.6	Reset button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
4	Prism wash systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		17
	4.1	Prism coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	4.2	Prism wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	4.2.1	Recommended wash pressures and times . . . . . . . . . . . . . . . . . . . . . . . .	18
	4.2.2	Prism wash systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
	4.2.3	Prism wash nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25
5	Startup and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		29
	5.1	Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
	5.1.1	Initial check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
	5.1.2	Calibration check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	30
	5.1.3	Testing prism wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	30
	5.2	Using the Indicating transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	30
	5.2.1	Keyboard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	31
	5.2.2	Display setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	31
	5.3	Viewing system information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	33
	5.4	Viewing sensor status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	34
	5.4.1	Optical image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	34
	5.4.2	Optical image with IDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	34

	5.4.3	Diagnostic values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	35
	5.4.4	Temperature measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	36
	5.4.5	Sensor head humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	36
	5.5	Sensor verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	36
6	Configuration and calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		37
	6.1	Configuring output signal damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
	6.1.1	Exponential damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
	6.1.2	Linear damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	38
	6.1.3	Slew rate limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	38
	6.2	Configuring output signal hold functionality . . . . . . . . . . . . . . . . . . . . . . . .	38
	6.2.1	External hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39
	6.2.2	Hold during wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39
	6.2.3	Tolerance time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39
	6.2.4	QF threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	40
	6.2.5	Hold source interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	40
	6.2.6	Hold and signal damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	41
	6.2.7	Hold functions with DD-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	41
	6.3	Configuring relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	42
	6.4	Configuring input switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	44
	6.5	Configuring refractometer system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	45
	6.5.1	Configuring mA outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	45
	6.6	Calibrating the concentration measurement . . . . . . . . . . . . . . . . . . . . . . . .	48
	6.6.1	The chemical curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	49
	6.6.2	Selecting display units and display decimals . . . . . . . . . . . . . . . . . . . . . . .	49
	6.6.3	Field calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	49
	6.6.4	Entering field calibration parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
	6.6.5	Direct BIAS adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
	6.7	Configuring prism wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
	6.7.1	Wash cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
	6.7.2	Setting prism wash parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	55
7	Regular maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		57
	7.1	Checking the sensor humidity level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	57
	7.2	Checking the prism and prism gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	57
	7.3	Disassembling and assembling the sensor . . . . . . . . . . . . . . . . . . . . . . . . .	57
	7.3.1	Disassembling the sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	58
	7.3.2	Replacing the dryer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	59
	7.3.3	Replacing the prism and prism gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . .	59
8	Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		63
	8.1	Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	63
	8.1.1	Blank display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	64
	8.1.2	Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	66
	8.1.3	Display unreadable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	67
	8.1.4	Message NO SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	68
	8.1.5	Message NO SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	68
	8.1.6	Message SHORT-CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	68
	8.1.7	Message HIGH SENSOR HUMIDITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	69

	8.1.8	Message HIGH SENSOR TEMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	69
	8.1.9	Message HIGH TRANSMITTER TEMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	69
	8.1.10	Message LOW TRANSMITTER VOLT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	69
	8.1.11	Relays and switches not working . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	69
	8.1.12	Output signal error during NORMAL OPERATION . . . . . . . . . . . . . . . . . . . . . .	69
	8.2	Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	70
	8.2.1	Message OUTSIDE LIGHT ERROR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	70
	8.2.2	Message NO OPTICAL IMAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	70
	8.2.3	Message PRISM COATED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	70
	8.2.4	Message OUTSIDE LIGHT TO PRISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	71
	8.2.5	Message LOW IMAGE QUALITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	71
	8.2.6	Message NO SAMPLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	71
	8.2.7	Message TEMP MEASUREMENT FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	71
	8.2.8	Concentration drift during NORMAL OPERATION . . . . . . . . . . . . . . . . . . . . . .	71
	8.3	Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	72
	8.3.1	Message EXTERNAL HOLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	72
	8.3.2	Messages PRECONDITIONING, WASH, RECOVERING . . . . . . . . . . . . . . . . . . . . . . .	72
	8.3.3	Message PRISM WASH WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	72
	8.3.4	Message PRISM WASH FAILURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	72
	8.3.5	Message EXTERNAL WASH STOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	72
	8.3.6	Message LOW TEMP WASH STOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	72
	8.3.7	Message NO SAMPLE/WASH STOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	72
	8.4	Diagnostic messages table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	73
9	Sensor specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		75
	9.1	Sensor compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	75
	9.2	Sensor rangeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	75
	9.3	Sanitary process refractometer PR-23-AC . . . . . . . . . . . . . . . . . . . . . . . . . .	76
	9.3.1	PR-23-AC sensor model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	76
	9.3.2	PR-23-AC mounting hardware model code . . . . . . . . . . . . . . . . . . . . . . . .	77
	9.3.3	PR-23-AC specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	78
	9.3.4	PR-23-AC parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	79
	9.3.5	PR-23-AC mounting specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	80
	9.3.6	PR-23-AC I-Line fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	83
	9.3.7	3A Sanitary Standard compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	83
	9.4	Sanitary probe refractometer PR-23-AP . . . . . . . . . . . . . . . . . . . . . . . . . . . .	84
	9.4.1	PR-23-AP model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	84
	9.4.2	PR-23-AP mounting hardware model code . . . . . . . . . . . . . . . . . . . . . . . .	84
	9.4.3	PR-23-AP specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	85
	9.4.4	PR-23-AP parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	86
	9.4.5	PR-23-AP mounting specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	87
	9.4.6	PR-23-AP I-Line fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	88
	9.4.7	3A Sanitary Standard compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	88
	9.5	Compact process refractometer PR-23-GC . . . . . . . . . . . . . . . . . . . . . . . . . .	89
	9.5.1	PR-23-GC sensor model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	89
	9.5.2	PR-23-GC specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	91
	9.5.3	PR-23-GC parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	92
	9.5.4	PR-23-GC mounting specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	93

9.6	Probe process refractometer PR-23-GP . . . . . . . . . . . . . . . . . . . . . . .	. . . . . 98
9.6.1	PR-23-GP sensor model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . 98
9.6.2	PR-23-GP specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . 99
9.6.3	PR-23-GP parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 100
9.6.4	PR-23-GP mounting specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 101
9.7	Process refractometer PR-23-RP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 103
9.7.1	PR-23-RP sensor model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 103
9.7.2	PR-23-RP specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 104
9.7.3	PR-23-RP parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 105
9.7.4	PR-23-RP head parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 106
9.7.5	PR-23-RP dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 107
9.7.6	PR-23-RP mounting specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 108
9.7.7	PR-23-RP prism wash system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 111
9.8	Teflon body refractometer PR-23-M/MS . . . . . . . . . . . . . . . . . . . . . . .	. . . 112
9.8.1	PR-23-M sensor model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 113
9.8.2	PR-23-M specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 114
9.8.3	PR-23-M parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 115
9.8.4	PR-23-MS sensor model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 116
9.8.5	PR-23-MS specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 117
9.8.6	PR-23-MS parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 118
9.8.7	PR-23-MS sensor jacket to protect the sensor from external light	. . . . 119
9.8.8	PR-23-M/MS mounting specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 120
9.9	Saunders body refractometer PR-23-W . . . . . . . . . . . . . . . . . . . . . . . .	. . . 121
9.9.1	PR-23-W sensor model code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 122
9.9.2	PR-23-W specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 123
9.9.3	PR-23-W parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 124
9.9.4	PR-23-W mounting specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 125

9.10PR-23 process refractometers in potentially

		explosive atmosphere . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . 126
9.10.1		Equipment . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 126
9.10.2		Installation . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 128
9.11	Intrinsically safe refractometers PR-23-...		-IA
		and PR-23-...-IF . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 130
9.11.1		Equipment . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 130
9.11.2		Intrinsically safe mounting . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 132
9.11.3		Isolator/barriers . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 135
10 Indicating transmitter DTR specifications . . . . . .			. . . . . . . . . . . . . . . . . . . . . . . . . . 137
10.1		Compatibility . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 137
10.1.1		Transmitter program versions . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 138
10.2		Model code . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 139
10.2.1		Transmitter model code . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 139
10.2.2		STR model code . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 139
10.2.3		Interconnecting cable model code . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 139
10.3		Specifications . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 140
10.3.1		Indicating transmitter specifications . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 140
10.3.2		Interconnecting cable specifications . .	. . . . . . . . . . . . . . . . . . . . . . . . . . 140

	10.4		Transmitter parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	141
11	Safe-Drive™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			143
	11.1		System description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	143
	11.2		Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	144
	11.3		Parts lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	145
	11.3.1		PR-23-SD sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	145
	11.3.2		Safe-Drive™ Isolation valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	146
	11.3.3		Safe-Drive™ Retractor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	147
	11.4		Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	147
	11.4.1		Welding isolation valve to pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	148
	11.4.2		Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	152
	11.4.3		Steam piping for SDI2 (eg weak and black liquor) . . . . . . . . . . . . . . . . . .	153
	11.4.4		High pressure water piping for SDI2 (eg green liquor) . . . . . . . . . . . . . .	154
	11.5		Safe sensor insertion and removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	155
	11.5.1		Sensor insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	156
	11.5.2		Sensor removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	159
	11.6	Wash nozzle insertion and removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		162
	11.6.1		Wash nozzle insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	162
	11.6.2		Wash nozzle removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	163
12	Ethernet connection specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			165
	12.1	Cable requirements and connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		165
	12.1.1		Ethernet cable specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	165
	12.1.2		Connecting the Ethernet cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	166
	12.2		Connection settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	167
	12.2.1		IP settings for DTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	167
	12.2.2		IP settings for stand-alone computer . . . . . . . . . . . . . . . . . . . . . . . . . . .	167
	12.3	Testing the Ethernet connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		168
	12.3.1		Troubleshooting the connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	169
	12.4		Instrument homepage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	170
	12.4.1		Remote panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	171
	12.4.2		Sensor verification certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	171
	12.5	Collecting data via Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		171
	12.5.1		Communication protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	172
	12.5.2		Request-response pair specification . . . . . . . . . . . . . . . . . . . . . . . . . . . .	173
	12.5.3		Error message specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	175
13	Sensor verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			177
	13.1		Refractive index nDverification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	178
	13.2		Verification procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	178
	13.3		Sensor verification certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	181
	13.4		Corrective action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	182
14 Regulatory compliance and certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .				185
	14.1	EC Declaration of Conformity for PR-23 series of
			refractometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	185
	14.2		Declaration of Conformity for PR-23-...-AX models (ATEX) . . . . . . . . . . . .	186

	14.3 Declaration of Conformity for PR-23-...-IA models (ATEX) . . . . . . . . . . . .	187
A	Glossary and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	189
B	Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	191
C	PR-23 sensor verification form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	197
D	PR-23 field calibration form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	199
E	DTR command selection tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	201
F	STR/Divert mode command selection tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	203

1 Introduction

1

1 Introduction

The K-Patents PR-23 inline refractometer is an instrument for measuring liquid concentration in the process line. The measurement is based on the refraction of light in the process medium, an accurate and safe way of measuring liquid concentration.

The inline refractometer sensor (in Figure 1.1) measures the refractive index nD and the temperature of the process medium. This information is sent via the interconnecting cable (B) to the Indicating transmitter (C). The Indicating transmitter DTR calculates the concentration of the process liquid based on the refractive index and temperature, taking pre-defined process conditions into account. The output of the DTR is a 4 to 20 mA DC output signal proportional to process solution concentration. Process data can also be downloaded to a computer via an Ethernet cable.

POWER

	PROCESS INSTRUMENTS
A: Sensors	B: Interconnecting cables C: Indicating transmitter

Figure 1.1 Refractometer equipment

1.1 PR-23 refractometer models

ThebasicsystemofoneortwosensorsconnectedtoanIndicatingtransmitter(DTR) is the same for all PR-23 inline refractometer models. However, there are different sensor models, each model is adapted for different process requirements.

The models PR-23-AC and PR-23-AP meet the 3-A Sanitary Standard requirements. With an ATEX approved PR-23-...-AX sensor or a FM approved PR-23-...-FM sensor or a CSA approved PR-23-...-CS sensor a PR-23 process refractometer system can be used in potentially explosive atmosphere. The ATEX approved Intrinsically safe refractometer PR-23-...-IA can even be used in explosive atmosphere. The Safe-Drive™ system with a PR-23-SD sensor enables safe sensor insertion and removal also when process line is in full operation.

2	PR-23 instruction manual

1.2 Principle of measurement

The K-Patents inline refractometer sensor determines the refractive index nD of the process solution. It measures the critical angle of refraction using a yellow LED light source with the same wavelength (580 nm) as the sodium D line (hence nD). Light from the light source (L) in Figure 1.2 is directed to the interface between the prism

(P)andtheprocessmedium(S).Twooftheprismsurfaces(M)actasmirrorsbending the light rays so that they meet the interface at different angles.

A C B

L

P

M M

S

Figure 1.2 Refractometer principle

Thereflectedraysoflightformanimage(ACB),where(C)isthepositionofthecritical angle ray. The rays at (A) are totally internally reflected at the process interface, the rays at (B) are partially reflected and partially refracted into the process solution. In this way the optical image is divided into a light area (A) and a dark area (B). The positionoftheshadowedge(C)indicatesthevalueofthecriticalangle. Therefractive index nD can then be determined from this position.

TherefractiveindexnDchangeswiththeprocesssolutionconcentrationandtemperature. When the concentration changes, the refractive index normally increases when the concentration increases. At higher temperatures the refractive index is smaller than at lower temperatures. From this follows that the optical image changes with the process solution concentration as shown in Figure 1.3. The color of the solution, gasbubblesorundissolvedparticlesdonotaffectthepositionoftheshadowedge(C).

A	C B	A C	B
Low concentration		High concentration

Figure 1.3 Optical images

1 Introduction

3

The position of the shadow edge is measured digitally using a CCD element (Figure 1.4) and is converted to a refractive index value nD by a processor inside the sensor. This value is then transmitted together with the process temperature via an interconnectingcabletotheIndicatingtransmitterforfurtherprocessing,displayand transmission.

a. Optical image

b. CCD element

V

c. CCD output

Figure 1.4 Optical image detection

1.3 General safety considerations

Theprocessmediummaybehotorotherwisehazardous. Useshieldsandprotective clothing adequate for the process medium - do not rely on avoiding contact with the process medium.

•Precautions when removing a standard sensor from the process line :

Check first that the process line is depressurized. Open a vent valve to the atmos-

•phere.

Foraprismwashsystem,closeahandvalveforthewashmediumanddisablethe

•wash valve.

•Loosen the flange or the clamp cautiously, be prepared to tighten again.

Ensure you are clear of any possible spillage and you have a clear emergency es-

•cape path.

Afterremovalofthesensor,itmaybenecessarytomountablindcoverforsecurity

reasons.

Note: For the Safe-Drive™ system safety rules, see Section 11.5 and for additional precautions required by explosive atmosphere, see Section 9.10.2.

4	PR-23 instruction manual

1.4 Warranty

K-Patents is rigorous in ensuring that all products manufactured and supplied by K-Patentsshallbefreeofdefectsinmaterialandworkmanship. K-Patentsagreestoei- therreplaceorrepairfreeofchargeanyproductfoundtobedefective,orpartsthereof whenreturnedtothenearestauthorizedK-Patentsrepairfacilitywithintwo(2)years of the product’s delivery date.

Before returning a defective product for service or replacement, please contact K-Patents or your nearest K-Patents representative (see http://www.kpatents.com/ forcontactinformation). Forthehealthandsafetyofpersonnelhandlingyourreturn, clean the instrument, especially the parts that have been in contact with the process liquid, before packing it. Ship the cleaned instrument to the address given to you.

1.5 Disposal

When wishing to dispose of an obsolete instrument or any parts of an instrument, please observe local and national regulations and requirements for the disposal of electrical and electronic equipment. An aluminium or stainless steel sensor housing can be recycled with other metallic waste of the same type.

2 Inline refractometer sensor

5

2 Inline refractometer sensor

2.1 Sensor description

Figure2.1belowshowsacutawaypictureofaPR-23inlinerefractometersensor. The measurement prism (A) is flush mounted to the surface of the probe tip. The prism

(A)andalltheotheropticalcomponentsarefixedtothesolidcoremodule(C),which isspringloaded(D)againsttheprismgasket(B).Thelightsource(L)isayellowLight Emitting Diode (LED), and the receiver is a CCD element (E). The electronics is protected against process heat by a thermal isolator (K) and cooling fins (G). The sensor processor card (H) receives the raw data from the CCD element (E) and the Pt-1000 processtemperatureprobe(F),thencalculatestherefractiveindexnDandtheprocess temperature T. This information is transmitted to the Indicating transmitter.

(G) Cooling fins

(E) CCD element

(H) Sensor processor

card

(D) Disc spring

(K) Thermal isolator

(L) Light source

(C) Core module

	(A) Prism
(F) Temperature probe	(B) Gasket
	Figure 2.1 PR-23 sensor structure

6	PR-23 instruction manual

2.2 Mounting the sensor

Thesensormountinglocationshouldbechosenwithcaretoensurereliablereadings fromtheprocess. Somebasicrules,describedinthissection,applytoallsensormodels. ThemodelspecificinstructionscanbefoundinChapter9,“Sensorspecifications”. For the Sanitary compact refractometer PR-23-AC see Section 9.3, for the Probe sanitary refractometer PR-23-AP see Section 9.4, for the Process probe refractometer PR-23-GPseeSection9.6,fortheTeflonbodyrefractometerPR-23-MandTeflonbody semicon refractometer PR-23-MS see Section 9.8 and for the Saunders body refractometer PR-23-W see Section 9.9. For mounting an ATEX/FM/CSA approved sensor inexplosiveatmosphere,seeSection9.10.2. Formountinganintrinsicallysaferefractometer PR-23-...-IA, see Section 9.11. For mounting of the Safe-Drive™ system with the PR-23-SD sensor, see Section 11.4.

2.2.1 Choosing sensor mounting location

A K-Patents inline refractometer sensor can be located either indoors or outdoors in most climates. However, when a sensor is located outdoors, some basic protection againstdirectexposuretosunlightandrainshouldbeprovided. Specialcareshouldbe taken if the pipe wall is translucent (e.g. of fiberglass), as light from outside reaching the prism through the pipe wall may disturb the measurement.

The mounting location needs to be such that sediments or gas bubbles cannot accumulate by the sensor. Good flow velocity is essential in keeping the prism clean.

Important: If the process pipe vibrates, support the pipe. A vibrating pipe might damage the in-line sensor mounted on it.

Alwayscheckthatthesensorheadiskeptcoolenough;thesensorheadshouldnotbe toohottokeepahandon. Thesensorcovershouldnotbeexposedtohightemperature radiation. In most cases, draft and natural convection provide sufficient air cooling if the air gets to flow freely around the sensor head.

Additional cooling is necessary when the ambient temperature is higher than 45 °C (113 °F) or when the process temperature is above 110 °C (230 °F) and the ambient temperatureisabove35°C(95°F).Theaircoolingisimprovedbyblowingpressurized air against the sensor cover. The pressurized air can be supplied by the ventilation system. If no air is available it is also possible to wind a copper coil for cooling water around the sensor head cover.

Important: Alwaysmountthesensorsothattheinterconnectingcablepointsdownwards from the sensor head.

2 Inline refractometer sensor

7

2.2.2 PR-23 mounting guide

8	PR-23 instruction manual

2.2.3 Check list for pipe mounting

Most K-Patentsinline refractometermodels aremounted in a pipe. K-Patents recommends a minimum flow velocity of 1.5 m/s (5 ft/s). The diameter and form of the pipe and the process temperature all affect the measurement and need to be taken into account.

1.If the process pipe diameter varies, select the position with the smallest diameter (and accordingly highest velocity). Then the prism keeps better clean.

2.Iftherefractometerisusedinafeed-backcontrolloop,makethetimelagshort. E.g. when a dilution valve is controlled, mount the refractometer close to the dilution point. However, make sure complete mixing has occurred at mounting location.

3.Ifthetemperaturevariesalongtheprocesspipe,selectthepositionwiththehighest processtemperature. Thentheriskofprismcoatingisminimized,becausehigher temperature means higher solubility and also lower viscosity.

4.Often the position with the highest process pressure (= after pump + before valve) has favorable flow conditions without sedimentation or air trapping risks.

5.The sensor should be conveniently accessible for service.

2.2.4 Check list for mounting in a tank, a vessel or a large pipe

A probe sensor PR-23-AP or PR-23-GP can be inserted with a flange or clamp into tanks and vesselswhich either don’thavea scraperor where the mixer doesn’t touch the vessel wall. A probe sensor can also be flush mounted in a cooker where the scraper touches the wall.

1.The inserted probe sensor is mounted close to a stirrer to ensure representative sample of the process liquid and to keep the prism clean.

2.The sensor should be conveniently accessible for service.

3 Indicating transmitter DTR

9

3 Indicating transmitter DTR

3.1 Indicating transmitter description

The Indicating transmitter DTR is a specialized computer designed to process data received from one or two sensors. The Indicating transmitter enclosure (Figure 3.1) containsafrontpanelwithabacklitLiquidCrystalDisplay(LCD)andakeyboard. The front panel swings open to give access for connections and service. Knockout padlockprovisionsareincludedintheenclosure’sbothcoverlatchesforlockstoprevent unauthorized access.

POWER

PROCESS INSTRUMENTS

Figure 3.1 The Indicating transmitter enclosure

The sensors send the values of the refractive index nDand the process temperature T to the DTR. The microprocessor system then linearizes the concentration reading (example in Figure 3.2), and performs an automatic temperature compensation.

70 BRIX

60

50

40

30

20

10

nD

1.35

1.40

1.45

Figure 3.2 A linearized curve

10	PR-23 instruction manual

3.2 Mounting Indicating transmitter

The Indicating transmitter is mounted indoors, it should preferably be located in an easily accessible, well lit and dry area. Avoid vibration. Take interconnecting cable length into consideration when choosing the mounting location.

Theenclosureismountedverticallyonanuprightsurface(wall)usingfourmounting feet, see Figure 3.3. The LCD is best viewed when approximately on the eye level of the user.

In sanitary installations, K-Patents recommends using a DTR with stainless steel enclosure. Ifstandardpolycarbonateenclosureisused,itshouldbeinstalledasremotely as practical from the product areas or connections.

Important: Do not drill mounting holes in the enclosure as that will affect the protection class of the enclosure and damage the electronics.

Figure 3.3 Indicating transmitter: dimensions (mm/in)

and mounting feet measures

Note: The LCD display has an operating temperature range of 0–50 °C and a storage temperature range of -20–60 °C.

Important: The DTR does not have a built-in power switch. The system is always poweredonwhenconnectedtoapowersource. K-Patentsrecommendsmountingan external power switch to control the DTR’s power supply, Figure 3.6.

3.3 Electrical connections

3.3.1 Interconnecting cable

The cable contains a pair of twisted signal wires (1, 2) and a cable shield (3) (see Section 3.3.2 and Figure 3.7). Standard delivery is 10 meters (33 feet) of cable. The maximumlengthofaninterconnectingcableis200m(660ft). Thesignalwires(1,2) are interchangeable (non-polarized). The cable shield is connected to the protective earth at the Indicating transmitter.

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11

The junction box enables the use of customer’s own cable as long as it meets IEC61158-2typeAstandardrequirements,seeSection10.3.2,“Interconnectingcable specifications”.

3.3.2 Connecting sensor

1.Remove the four screws holding the Sensor nameplate (Figure 3.4). The terminal strip is under the nameplate.

2.Connect the signal wires to terminal (1) and (2), and the cable shield to terminal

(3).

3.Tighten up cable gland. Screw nameplate back on.

Figure 3.4 Sensor electrical connections

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3.3.3 Connecting the Indicating transmitter

All the electrical terminals of the Indicating transmitter are behind the Front panel. To access them, first open the enclosure cover. Then loosen the front panel screw (Figure 3.5) and swing open the Front panel. All terminals are now accessible.

POWER

INDICATOR

LIGHT

FRONT

PANEL

SCREW

Figure 3.5 Opening the Front panel of the Indicating transmitter

Figure 3.6 The recommended external power switch, K-Patents

part nr PR-10900. The ratings of the switch are 10A/230V.

Warning! Check that the power is off before opening the Front panel. If the green power indicator light (Figure 3.5) is on, there is still power in the system. To

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13

completely turn the power off, use the external power switch. The external power switch shall be installed in accordance with the local installation requirements.

6

Figure 3.7 Motherboard of the Indicating transmitter for AC power

6

POWER

+ -

Figure 3.8 Motherboard of the Indicating transmitter for 24V DC power

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Descriptionoftheterminalson theH1interfacecardPR-10701andon theTransmitter motherboard PR-10600 (Figure 3.7):

On H1

A 1 2 3	Connection for Sensor A, signal wires (1, 2), cable shield (3).
B 1 2 3	Connection for Sensor B, signal wires (1, 2), cable shield (3).
On Motherboard
11 12	4–20 mA output 1, positive (11), negative (12), max. load 1000 Ohm, galvanically isolated.
13 14	4–20 mA output 2, positive (13), negative (14), max. load 1000 Ohm, galvanically isolated.
21 22	Relay 1, one contact output, max. 250 V AC, max. 3 A.
23 24	Relay 2, one contact output, max. 250 V AC, max. 3 A.
31 32 33	Power, L (31), N (32), protective earth (33), 100-240 V AC, 50–60 Hz. An external power switch
	(Figure 3.6) is recommended.
41 42	24V terminal for DTR internal use only.
	Note: Connecting terminal to external 24V supply will void warranty. Connecting external
	devices to 24V terminal will void warranty.
51 52 53 54 55	Switch inputs: switch 1 (51), switch 2 (52), switch 3 (53), switch 4 (54) and common (55). A
	voltage of 3 V DC is provided over each switch. The switch terminals are galvanically isolated.

3.3.4 Power terminals for AC power

The primary AC power is connected to a separate terminal strip 31/32/33 marked POWER inthelowerright-handcorneroftheMotherboard(Figure3.7). Thethreeterminals are marked 31/L, 32/N and 33/PE (protective earth). The power terminal 33/PE is directly connected to the exposed metal parts of the Indicating transmitter DTR. Wiring to the terminals shall be 1.5mm2 minimum. The protective fuse in the building system shall comply with the local requirements.

3.3.5 Power terminals for 24V DC power

The DC power is connected to a terminal stripe marked POWER in the lower righthandcorneroftheMotherboard(figure3.8). Thethreeterminalsaremarked+,-and PE/33 (protective earth). The power terminal PE/33 is directly connected to the exposed metal parts of the Indicating transmitter DTR.

The 24V DC power to this terminal stripe shall be supplied from a secondary circuit which is double or reinforced insulated from the mains supply within the limits for a limited-energy circuit (maximum 200 VA/U) according to the IEC 61010-1.

3.3.6 Reset button

ItispossibletoresetandrestartboththeIndicatingtransmitterDTRandthesensor(s) by pushing the reset button. The button is accessed through the cable hole in the front panel shield (see Figure 3.9 below). You need a thin stick or similar utensil, preferably of non-conducting material, to reach the reset button. After pressing the

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resetbutton,thedisplaywillblackoutforafewseconds. Theinstrumentwillbeback to full operation within 30 seconds.

Reset button

Figure 3.9 Location of the reset button

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4 Prism wash systems

4.1 Prism coating

Deposit build-up on the prism surface disturbs the measurement. Look out for an abnormally high concentration reading or an upward concentration (CONC) drift.

Inmostapplicationstheprismwillkeepcleanduetotheself-cleaningeffect. Ifcoating −occurs, check the following:

− Sufficient flow velocity, see Section 2.2.3, “Check list for pipe mounting”.

Atemperaturedifferencebetweenprocessfluidandsensorprobemaycausecoating. This may happen with small flows if the thermal insulation is inadequate. In some cases it helps to also insulate the clamp connector.

In case of a coating problem, the preferred solution is to try to increase the flow velocity, e.g. by installing a pipe portion with smaller diameter.

Installing a wash nozzle can be considered, if increasing the velocity or using a flow booster does not provide a solution (Section 4.2).

4.2 Prism wash

Three alternative media can be used for prism wash: steam, water, high pressure water. The built-in relays of the Indicating transmitter can be configured to control the prism wash cycle, see Section 6.3, “Configuring relays”.

Important: In food industry applications, wash media must be culinary steam or safewater. Shut-off valveand checkvalvemustmeet3-Asanitarystandards(seeFig- ures 4.2 and 4.5.

CulinarySteam:Shallmeansteamproducedusingasystemmeetingcriteriainthe3-A Accepted Practices for a Method of Producing Steam of a Culinary Quality, Number 609.

SafeWater:Shallmeanwaterfromasupplyproperlylocated,protected,andoperated, and shall be of safe, sanitary quality. The water shall meet the standards prescribed in the National Primary Drinking Water Regulation of the Environmental Protection Agency (EPA) as referenced in The Code of Federal Regulations (CFR), Title 40, Parts 141, 142, and 143.

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4.2.1 Recommended wash pressures and times

The recommended wash pressures and times are given in the tables below.

Wash medium parameters for integral wash nozzles in PR-23-AP/GP

Minimum above

Maximum above

Wash

Recovery

Interval

process pressure

process pressure

time

Steam (SN)

2 bar (30 psi)

4 bar (60 psi)

3 s

20–30 s

20–30 min

Water (WN)

2 bar (30 psi)

4 bar (60 psi)

10 s

20–30 s

10–20 min

High pressure water (WP)

15 bar (220 psi)

40 bar (600 psi)

10 s

20–30 s

10–20 min

Wash medium parameters for flow cell wash nozzle AFC

Minimum above

Maximum above

Wash

Reco-

Interval

process pressure

process pressure

time

very

Steam (SN)

3 bar (45 psi)

6 bar (90 psi)

3–5 s

20–30 s

20–30 min

Water (WN)

3 bar (45 psi)

6 bar (90 psi)

10–15 s

20–30 s

10–20 min

High pressure water (WP)

25 bar (350 psi)

35 bar (500 psi)

10–15 s

20–30 s

10–20 min

Wash medium parameters for Safe-Drive Isolation valve nozzle SDI

CONC % value

Minimum above

Maximum above

Wash

Reco-

Interval

process pressure

process pressure

time

very

Steam (SN)

10–30 %

2 bar (30 psi)

4 bar (60 psi)

2–3 s

20 s

120–360 min

30–60 %

3 bar (45 psi)

6 bar (90 psi)

3 s

20 s

20-60 min

60–90 %

4 bar (60 psi)

8 bar (120 psi)

3–5 s

20 s

15-25 min

High pressure water (WP)

25 bar (350 psi)

50 bar (725 psi)

10–15 s

20 s

5–20 min

Important: In steam wash, do not exceed the recommended wash times, because someprocessmediamayburntotheprismsurfaceifsteamedforlongertime. Incase of coating, shorten the wash interval.

See also Section 6.7.2 for the Automatic wash cut parameter.

Note: In water wash, water temperature should be above the process temperature.

Note: The check valve pressure drop is 0.7 bar (10 psi).

4.2.2 Prism wash systems

The prism wash system for steam is described by Figure 4.1 and for sanitary systems Figure 4.2. The prism was system for high pressure water is described by Figure 4.4 and for sanitary systems Figure 4.5.

Warning! In high pressure wash systems, pressure increase can occur in a closed pipe section when the high pressure pump is operated. K-Patents recommends to mountapressurereliefvalveinthepipesection. Reliefpressureshouldbeaccording to pipe pressure rating.

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Figure 4.1 A prism wash system for steam (non-sanitary)

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PR-23 instruction manual

Figure 4.2 A sanitary prism wash system for steam

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Figure 4.3 Wiring for a prism wash system for steam

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PR-23 instruction manual

Figure 4.4 A prism wash system for high pressure water (non-sanitary)