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KAHN INSTRUMENTS, INC.

885 Wells Road, Wethersfield, CT 06109

Tel: 860-529-8643; Fax: 860-529-1895

E-mail: [email protected]

www.kahn.com

4.5

User Inputs / Outputs

4.5.1 Analog Inputs / Outputs

The monitor unit features, as standard, the following inputs and outputs. These are
available on the “User I/O” connector located at the rear of the monitor unit.

Pin
Number

Function

Range

Notes

0V Analog

Dewpoint 4-20mA

-60 to +30

Cdp

Max 500

Ω

Load

Dewpoint 10mV/

-100 to +100

Cdp

Temperature 4-20mA

-50 to +50 °Cdp

Max 500

Ω

Load

Temperature 10mV/

-80 to +80

% RH 4-20mA

0 to 100 %

Max 500

Ω

Load

% RH 0-1 V D.C.

0 to 100 %

0V Digital

Data Hold TTL

5V = Data Held

Digital Output

ABC TTL

5V = Balancing

Digital Output

Optics Alarm

0V = Alarm

Digital Output

Remote ABC Initiate

0V to initiate

Input

The “USER I/O” connector located on the Monitor rear panel is a 12 way screw-terminal
type and accepts wire pin or bare wire connections.

Содержание S4000 Integrale

Страница 1: ...N INSTRUMENTS INC 885 Wells Road Wethersfield CT 06109 Tel 860 529 8643 Fax 860 529 1895 E mail info kahn com www kahn com SERIES 4000 PRECISION DEWPOINT HYGROMETER Integrale INSTALLATION OPERATION AND MAINTENANCE MANUAL ...

Страница 2: ...tic Balance Compensation ABC 9 2 8 Automatic Balance Compensation On Request 10 2 9 Data Hold 10 2 10 Clean Optics Warning 11 2 11 Max Cool 11 2 12 Display Operation 12 2 12 1 Upper Display 12 2 12 2 Lower Display 13 2 13 Pressure Measurement 15 3 INSTALLATION 16 3 1 General 16 3 3 Connecting the Sample Gas 17 3 4 Electrical Connections 17 4 OPERATION 18 4 1 General 18 4 2 Sampling Hints 18 4 3 Wh...

Страница 3: ...l info kahn com www kahn com 4 5 2 Digital Interface 23 4 6 Microscope 25 5 TECHNICAL SPECIFICATIONS 26 5 1 General 26 5 2 Sensor 26 5 3 Control Electronics 27 6 MAINTENANCE 29 6 1 Cleaning the Optical System 29 6 1 1 Cleaning Procedure 29 7 OPTIONS 31 7 1 RS485 Output 31 7 2 Remote Pressure Transducer 31 ...

Страница 4: ...d from the fundamental gas dewpoint and temperature at atmospheric pressure The instrument may also be configured to display measured gas pressure KPa using an external pressure transducer and use this measured pressure to calculate pressure compensated PPM V PPM W for SF6 g m3 and g kg The Series 4000 is based on the cooled mirror principle and is derived from a highly successful Transfer Standar...

Страница 5: ...ded 4 wire platinum resistance thermometer The monitoring electronics performs all the control functions for the sensor as well as measuring and displaying the dewpoint temperature An automatic balance compensation ABC system is incorporated in the monitor to eliminate the effects of mirror contamination build up ensuring continuous accurate operation If automatic balance is not required on a spec...

Страница 6: ... and display selection push buttons the MAX COOL pushbutton the DATA HOLD LED indicator the ABC STATUS LED indicator the OPERATION STANDBY switch and the ABC INITIATE push button 2 2 Rear Panel It is important that air flow to the two vents located on the rear panel of the monitor not be obstructed The operation of the instrument will be adversely affected by preventing sufficient cooling flow All...

Страница 7: ...the Peltier cooling device to below the dewpoint temperature until sufficient dew or ice forms on the mirror surface for the optical system to detect When this point is reached the electronic control circuit adjusts the Peltier device power until the mirror temperature is controlled at the equilibrium value where the rate of condensation equals the rate of evaporation dewpoint 2 4 Front Panel Cont...

Страница 8: ...tion refer to the relevant section or Section 4 a RS232 9 way D type connector for serial communication interface Refer to Section 4 5 2 b User I O 12 way analog digital Refer to Section 4 5 1 c SW4 ABC Duration Pre sets duration of ABC Cycle Refer to Section 2 8 d SW3 ABC Frequency Pre sets frequency of ABC Cycle Refer to Section 2 7 e SW2 Data Hold Duration Pre sets duration of dewpoint data hol...

Страница 9: ...g in a gradual loss of sensitivity To compensate for this a balancing system is provided The system works by heating the sensor mirror to a temperature sufficiently high to drive off all dew present and provide a dry mirror surface This compensates for the presence of any contamination and then the instrument reverts to the normal measuring mode This process is fully automated and does not require...

Страница 10: ...ation of the balance system in the ON RERQUEST mode allows the user to manually initiate a balance cycle instead if allowing the instrument to perform this task at set time intervals The process of balancing the optics system to compensate for any increase in contamination is still performed automatically If operating in this mode it becomes the responsibility of the user to perform ABC cycles at ...

Страница 11: ... SW2 7 N A SW2 8 N A Note that only one switch may be in the ON position at any time Note that to disable the Data Hold all switches SW2 1 to SW2 5 should be in the OFF position 2 10 Clean Optics Warning After some time in use when the optics have collected a considerable degree of contamination the balance system produces a warning signal demanding that the optics need to be cleaned This warning ...

Страница 12: ...ng operation if RH is selected the lower display will automatically display the sample gas temperature The display is configured such that two calculated parameters cannot be displayed at any time Note that the operation of the display depends on whether the remote temperature probe is connected If the probe is not connected remote temperature and RH is not displayed and C F mode is selected by th...

Страница 13: ...as Temperature either in C or F 2 12 2 Lower Display When the instrument is initially switched ON the water content in PPM V Parts Per Million by Volume is displayed on the lower display By pressing the lower UNIT SELECT push button the function of the lower display will change to display one of the following Parts Per Million by Weight in SF6 PPM W Parts Per Million by Volume PPM V Grams per cubi...

Страница 14: ... the PPM V PPM W g m3 and g kg parameters will also be temporarily held The sample gas temperature and pressure parameters are not held 3 If the upper display is indicating RH and the lower UNIT SELECT push button is pressed then PPM will be displayed and the upper display reverts to dewpoint in either C or F or P PPM V SF PPM W in SF6 G1 g m3 G2 g Kg Pr kPa F F P PPM V SF PPM W in SF6 G1 g m3 G2 ...

Страница 15: ...nt parameters are calculated using this pressure The pressure is displayed in kPa and is available as a digital output on the RS232 interface Refer to Section 4 5 2 The standard pressure range is 0 to 50 psi absolute but special pressure ranges may be supplied to order Contact Kahn Instruments Technical Sales Department for further information Remote Pressure Connection A 6 pin circular socket typ...

Страница 16: ... cores color coded as follows Brown Live Blue Neutral Green Yellow Ground WARNING This instrument must be connected to electrical ground for safety 3 2 Installing the Monitor The Series 4000 Precision Hygrometer monitor requires an operating environment of 0 to 40 C 0 to 90 RH The monitor case is designed for 19 3U rack mounting However it can be used as a bench mounted device without any special ...

Страница 17: ...anels of the Series 4000 Integrale Monitor Unit The instrument requires only a power supply for operation A 2 meter power cord is supplied as standard A suitable fused power plug conforming to local electrical safety regulations must be connected to the free end of the cord IMPORTANT Before connecting the instrument to an AC power source make sure that the power supply is within the limits of the ...

Страница 18: ...e source to the Monitor Unit is high enough to avoid long time lags in response to changes in humidity at the sample source We therefore recommend a flow rate of between 50 and 200 cm3 min 0 05 to 0 2 l min be set The ideal figure is 150 cm3 min 0 15 l min A flowmeter is provided on the front panel of the Monitor Unit Flow regulation is not provided within the Monitor Unit If gas flow must be regu...

Страница 19: ...r materials have hygroscopic characteristics and absorb moisture in the pipe walls Absorbed moisture will slow down measurement response and in extreme circumstances give false dewpoint readings For temporary applications or where stainless steel tubing is not feasible use high quality thick walled PTFE pipe which exhibits similar characteristics to stainless steel Always use the shortest run of t...

Страница 20: ...s provided in Section 2 Check that the sensor optics are clean as described in section 6 If the optional microscope is not being used ensure that the black blanking plug is screwed into the microscope fitting on the front of the Monitor Unit to prevent stray light from interfering with the optical detection system Set the sample gas flow rate to between 50 and 200 cm3 min 0 05 and 0 2 l min as ind...

Страница 21: ... contamination A balance cycle can be initiated at any time regardless of when the last periodic cycle was performed simply by pressing the front panel INITIATE button This balance cycle will be in addition to the periodic ABC cycles and will not reset the periodic timer 4 4 4 On Request ABC Operation Operation of the balance system in its On Request mode allows the user to manually initiate a bal...

Страница 22: ...on Range Notes 1 0V Analog 2 Dewpoint 4 20mA 60 to 30 Cdp Max 500 Ω Load 3 Dewpoint 10mV C 100 to 100 Cdp 4 Temperature 4 20mA 50 to 50 Cdp Max 500 Ω Load 5 Temperature 10mV C 80 to 80 C 6 RH 4 20mA 0 to 100 Max 500 Ω Load 7 RH 0 1 V D C 0 to 100 8 0V Digital 9 Data Hold TTL 5V Data Held Digital Output 10 ABC TTL 5V Balancing Digital Output 11 Optics Alarm 0V Alarm Digital Output 12 Remote ABC Ini...

Страница 23: ...g pin connections Pin Number Function 1 N C 2 Transmit data TXD 3 Receive data RXD 4 N C 5 Signal Ground GND 6 N C 7 Clear to send CTS 8 Request to send RTS 9 N C The serial link has the following protocol 9600 baud rate 8 data bits 1 stop bit No parity The following parameters may be read via the RS232 interface Dewpoint C Dewpoint F Water Content PPM V Water Content in SF6 PPM W Water Content g ...

Страница 24: ...3 gkg CR or GKG CR for Water Content in g kg prs CR or PRS CR for Pressure in Kpa rh CR or RH CR for Relative Humidity in tpc CR or TPC CR for Temperature in C tpf CR or TPF CR for Temperature in F CR carriage return 13 ASCII The S4000 instrument will respond with for example the following 15 47 degC or 27 56 degF or 5347 97 PPM V or 110 76 PPM W SF6 or 3 76 gM3 or 4 52 gKG or 101 3 KPa or 25 7 RH...

Страница 25: ...s Technical Sales Department The microscope allows direct viewing of condensate on the mirror surface providing visual evidence that ice crystals have formed in the critical region between 0 and 20 C dewpoint The microscope is fitted into the sensor cover by replacing the black screw threaded plug with the microscope Ensure the instrument is measuring a dewpoint then screw the microscope into the ...

Страница 26: ...hour at 60 C dewpoint Variable between these limits Sensitivity 0 01 C Repeatability 0 1 C dewpoint Power supply 90 to 260 Volts AC 50 60 Hz Power consumption Max 250 VA Power Fuse 3 15 Amp 250V 20 mm Time delay Heat Pump Fuse 3 15 Amp 250V 20 mm Time delay Operating temperature 0 to 40 C Performance quoted at 21 C ambient Operating environment 0 to 90 RH Dimensions mm 19 sub rack 133H 3U x 511D W...

Страница 27: ...ll protected from the gas by quartz light guides Sample flow rate 50 to 200 cm3 min Flow meter 50 to 500 cm3 min Pressure Maximum 10 barg 5 3 Control Electronics Digital display Dual 6 digit 7 segment LED with 2 digit 7 segment unit annunciators Units Top C dewpoint or F dewpoint Units Bottom PPM V or PPM W in SF6 or g m3 or g Kg or kPa Note If a pressure transducer is not connected to the instrum...

Страница 28: ...t PPM V Water Content in SF6 Sulphur Hexafluoride PM W Water Content g m3 Water Content g kg Pressure kPa Relative Humidity RH Temperature C Temperature F ABC Initiate RH Calculation Calculated using water vapor pressure tables D Sontag ITS 90 Over water for temperatures between 0 and 100 C and over ice for temperatures between 100 and 0 C Gas Temperature Accuracy 0 2 C PRT Probe Type Stainless St...

Страница 29: ...of effectiveness beyond which compensation cannot be ensured When this limit is reached the red ABC STATUS LED on the monitor front panel will light warning of heavy contamination At this point it is necessary to clean not only the mirror surface but also the light guide ends 6 1 1 Cleaning Procedure a Ensure that all surfaces are at a temperature above that of the freezing point of the cleaning f...

Страница 30: ...are to ensure that the o ring seal is correctly seated f After assembly press the INITIATE push button to initiate an ABC cycle Then re balance the instrument In a clean environment it is quite normal for the instrument to operate satisfactorily for several months without the need for optics cleaning However it is good practice to ensure the cleaning procedure is carried out regularly rather than ...

Страница 31: ...it No parity 7 2 Remote Pressure Transducer The standard S4000 Integrale Dewpoint Meter is configured such that all pressure sensitive parameters are calculated at 101 3 kPa atmospheric pressure As an option the instrument can be supplied with a pressure transducer to allow the actual sample gas pressure to be monitored and the PPM V PPM W g m3 and g kg parameters to be pressure compensated The st...

Страница 32: ...Page 32 KAHN INSTRUMENTS INC 885 Wells Road Wethersfield CT 06109 Tel 860 529 8643 Fax 860 529 1895 E mail info kahn com www kahn com APPENDIX 1 S4000 Integrale Outline Drawings INCL FEET POWER ...

Страница 33: ...T DP 4 20mA OUTPUT RS232 SERIAL COMMS MICRO PROCESSOR MIRROR TEMPERATURE MEASUREMENT PELTIER CURRENT CONTROL BALANCING SYSTEM PRT OUTPUT DEWPOINT SENSOR GAS SAMPLE IN GAS SAMPLE OUT PRESSURE MEASUREMENT DIGITAL DISPLAY PRESSURE TRANSDUCER USER CONTROL INTERFACE DIGITAL I O TEMPERATURE MEASUREMENT REMOTE PRT TEMP 10mV ºC OUTPUT TEMP 4 20mA OUTPUT RH 0 10V OUTPUT RH 4 20mA OUTPUT ...

Страница 34: ...rale Depression Range C 80 70 60 50 40 30 20 10 0 10 20 30 40 50 80 70 60 50 40 30 20 10 0 10 20 30 40 50 C As shown with the S4000 Integrale Dewpointmeter operating in an ambient temperature of 21 C the maximum depression is 62 C The upper dewpoint measurement limit is 19 C dewpoint and the lower dewpoint measurement limit is 60 C dewpoint Ambient Maximum ...

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