Hanna-instruments HI 720 Series Uživatelský manuál Strana 1

1Instruction ManualHI 720ConductivityProcess Controllerwith Inductive Probewww.hannainst.com

1819Setup Item Description Valid Values DefaultSetpoint 2C.24 Setpoint 2 reset time 0.1 to 999.9 minutes 999.9 min.C.25 Setpoint 2 rate time 0.0 to 99

2021Setup Item Description Valid Values DefaultAnalog Output 1O.13 Analog output 1 0 to f.s. 1999 μS/cmmaximum value (O_VARMIN1 ≤(O_VARMAX1) O_VARMAX

2223Setup Item Description Valid Values DefaultCOMMUNICATIONP.14 Remaining SMS 000 to 200, or 222 100(see note 22)P.15 Repeated SMS 0 to 5 (see note 2

2425Setup Item Description Valid Values DefaultERROR CONFIGURATIONE.21 Temperature level Alarm relay -------------> Onerror (21) 22 mA fault curren

2627NOTES:(1) M1 can not be set to “On/Off high” or “On/Off low” if O.10 is set to“Control-setpoint 1” and vice versa.0 ≤ LA + AH < HA - AH ≤ f.s.i

2829Error Alarm 22 mA 3.6 mA Hold Auto- SMSConfig. Relay fault curr. fault curr. mode cleaning sending22 OFF OFF ON ON ON OFF23 ON OFF ON ON ON OFF24

3031(17) If the relay 1 (or relay 2) mode is set to “Control-setpoint 1”, the analogoutput 1 can not be set to “Control-setpoint 1”, and vice versa. S

3233(30) This parameter set the number of latest measurements used to calculatean average value. The average is calculated both for conductivity/conce

3435zero calibration, and the “Wait ...” message will flash on the LCD. After com-pleting the procedure, the meter will ask for confirmation to procee

3637CONTROL MODEThe control mode is the normal operational mode for this meter. During controlmode HI 720 fulfills the following main tasks:• convert

23TABLE OF CONTENTS WARRANTY ...4 PRELIMINARY EXAMIN

3839Using the integral function (reset), the controller reaches a more stable outputaround the setpoint providing a more accurate control than the ON/

4041Example:• Max. slope = 30 mS / 5 min = 6 mS/min• Time delay = Tx = approx. 7 minutes• Deviation = Tx * 6 = 42 mS• Ti = Tx / 0.4 = 17.5 min• Td =

4243IDLE MODEWhile in idle mode, the device only performs measurements. It does not activaterelays or generate a control signal to the analog output(s

44453. Configuration changes: setup group, setup pa-rameter, date & time of the modification, previousvalue, new value.If the description of the p

4647Up to 10 actual conductivity/temperature couples can be entered to define thecurve for the temperature compensation.The default values for the tem

4849• CU is the concentration corresponding to the conductivity KU at the tempera-ture TU , and TU is the temperature of the isotherm just above TX .T

5051After the cause which made the instrument enter the hold mode expires, thedevice exits the hold mode, but control and alarms remain disabled for a

5253• Hold mode end delay: if the device was controlling, then the hold mode enddelay must expire before restarting control.If the device is in normal

5455ConnectionsThe connections for the 6-pin RS485 terminal provided are as follows:There is an internal short between the two A pins and between the

5657Command Parameter RemarksSET CNNP1P2C1C2C3C4Sets setup item C.NN (e.g. “r.01”) withparameter P1P2C1C2C3C4(*) (not availableif the controller is in

45WARRANTYAll Hanna Instruments meters are guaranteed for two years (sensors,electrodes and probes for six months) against defects in workmanship andm

5859C.10, C.20 Disabled = OFFOn/Off high = OOHI ; On/Off low = OOLOPID high =PIdH ; PID low = PIdLO.01, O.02 Disabled = OFFControl-setpoint 1 = SEt1Co

6061the first HI 92500 software version compatible with the firmware, even if it may notbe able to exploit all the features of the firmware, e.g. “34”

6263B1bit 4 setup updated (set to 1 after a device power-up, devicereset or a change in setup made through instrumentkeyboard; reset to 0 after receiv

6465desDi (calibration) USED FOR COND. CALIBRATION ONLYCell constant or installation factor valuedesDi (cleaning) Not usedEvents are logged in the eve

6667SHORT MESSAGING SERVICE (SMS)It is possible to connect the controller to a GSM cellular engine (HI 504900 orHI 504901). This connection enables t

6869stood as an information request. The instrument will hang up the call and sendan SMS about its current status (number of remaining messages, curre

7071MODEM CONNECTIONA modem connection can be established between HI 720 and a remote compu-ter over telephone line. Two different types of remote con

7273ERRORS - FAULT CONDITIONSThe below fault conditions may be detected by the software:• EEPROM data error• serial communication internal bus failure

7475(*): When the digital transmitter is used, these errors are generated in the digitaltransmitter, but they are handled as if they were generated in

7677SELFTEST PROCEDURESThe selftest procedures can be performed by entering the TEST menu in the setupmode and selecting the desired test.Note If no a

67GENERAL DESCRIPTION & THEORY OF OPERATIONThis instrument allows conductivity measurements without any electrical contactbetween electrodes and p

7879Once a value is entered, the corresponding current is immediately erogated bythe selected output and no confirmation is required.The minimum and m

8081INDUCTIVE CONDUCTIVITY PROBESCurrently available modelsInductive conductivity probe with 45 mm head OD, PVC sensor, wire direct con-nection, and 5

8283Recommendations for UsersBefore using these products, make sure that they are entirely suitable for the environment in which theyare used. Operati

84MAN720R1 01/06Australia:Tel. (03) 9769.0666 • Fax (03) 9769.0699China:Tel. (10) 88570068 • Fax (10) 88570060Egypt:Tel. & Fax (02) 2758.683Germ

89SPECIFICATIONSRange 0 to 2000 mS/cm (auto-ranging)-30 to 130°C / -22 to 266°FResolution 1 μS/cm (0 to 1999 μS/cm)0.01 mS/cm (2.00 to 19.99 mS/cm)0.1

10111. Connections for conductivity probe2. Connections for Pt100/Pt1000 temperature sensor3. Digital Transmitter input4. Hold input5. Advanced Cleani

1213 It is also possible to use a separate Pt100/Pt1000 temperature probe. In thecase of shielded wire, connect the shield to pin 4. In the case of

1415 The user can choose the desired parameter with the up & down arrow keys,and confirm the selection by pressing CFM.Note For some groups, it

1617Setup Item Description Valid Values DefaultTEMPERATUREb.03 Temperature measure °C, °F °Cunit (see note 32)b.10 Temp. compensation Linear, Linearal