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Electrical connections 

56 

10.  Electrical connections 

Notice: 

Use shielded cables only. 
The shield of the connecting cable is electrically connected to the plug housing. 

SERIAL 

RS232/RS485 serial interface (30) 

This port can be used to connect a computer with an RS232 or RS485 
cable for remote control of the circulator. 

Pin assignments RS232:

Pin 2   

RxD 

 

Receive Data 

Pin 3   

TxD 

 

Transmit Data 

Pin 5   

0 V 

 

Signal GND 

Pin 7   

RTS 

 

Request to send 

Pin 8   

CTS 

 

Clear to send 

Pin 1; 4; 6, 9 Reserved - do not use! 

Pin assignments: RS485 

Pin 3   

A 

Pin 5   

0 VD 

 

Signal GND 

Pin 8   

B 

Pins 1, 2, 4, 6, 7, 9 

 

Reserved - do not use! 

Accessories: 

Order No. 

Description 

8 980 073 

RS232 interface cable 9-pol./9-pol. , 2,5 m

8 900 110 

USB interface adapter cable  

REG+E-PROG 

Programmer input / temperature recorder output (31) 

Analog inputs / outputs see page 48 

Pin   

 

 

Signal 

 

1  Voltage output 

Channel 1 

0 ... 10 V 

2  Voltage output 

Channel 2 

0 ... 10 V 

3  GND for outputs 

 

0 V 

4  Programmer input  

EPROG 

0 to 10 V / 0 to 20 mA 

5  Current output 

Channel 3 

0 to 20 mA / 4 to 20 mA 

6  GND for Progammer 

 

0 V 

ALARM 

Alarm output (33) 

(for external alarm signal) 

This potential-free change-over contact is activated in case of an alarm 
when pins 2 and 3 are connected. 

Switching capacity 

max.   30 W / 40 VA 

Switching voltage  

max.   125 V /

Switching current  

max.   1 A 

Summary of Contents for Forte HT

Page 1: ... Temperature Circulator HT30 M1 C U cooling unit 1 950 3717 us V05 06 21 Forte HT with cooling unit JULABO USA Inc 884 Marcon Boulevard Allentown PA 18109 Phone 1 610 231 0250 Fax 1 610 231 0260 info julabo us www julabo us ...

Page 2: ...ndustry are developed produced and distributed according to the requirements of ISO 9001 and ISO 14001 Certificate Registration No 01 100044846 Unpacking and inspecting Unpack the instrument and accessories and inspect them for possible transport damage Damage should be reported to the responsible carrier railway or postal authority and a damage report should be requested These instructions must b...

Page 3: ...ons 16 5 PREPARATIONS 19 5 1 Setup 19 5 2 Installation 20 5 3 Bath fluids 23 5 4 Tubing 24 5 5 Power connection 25 5 6 Filling draining 25 5 7 Degasifying 27 5 8 Countercooling 29 6 OPERATING PROCEDURES 30 6 1 Switching on Selecting the language 30 7 MANUAL OPERATION 31 7 1 Start Stop 31 7 2 Setting the temperatures 31 7 3 Warning functions 32 7 4 Setting the safety temperature with shutdown funct...

Page 4: ...L CONNECTIONS 56 11 REMOTE CONTROL 58 11 1 Setup for remote control 58 11 2 Communication with a PC or a superordinated data system 59 11 3 List of commands 60 11 4 Status messages error messages 63 12 CLEANING REPAIRING THE UNIT 65 13 WARRANTY PROVISIONS 66 ...

Page 5: ...llows to set three different temperature values to store and to indicate them via the digital display LCD the working temperature and the values for the excess and lower temperature warning functions With the integrated programmer the instructions for setpoint and time for six different temperature profiles can be stored and called in Via an analog interface REG E PROG an analog programmer can be ...

Page 6: ... is checked for proper condition regularly depending on the conditions of use Regularly check at least every 2 years the proper condition of the mandatory warning prohibition and safety labels Make sure that the mains power supply has low impedance to avoid any negative effects on the instruments being operated on the same mains This unit is designed for operation in a controlled electromagnetic e...

Page 7: ...formation prior to beginning operation Scope EU 2 Semi S1 0701 Table A1 2 9 Carefully read the user information prior to beginning operation Scope USA NAFTA 3 Warning label Proposition 65 Particular care and attention is necessary because of the wide operating range There are thermal dangers Burn scald hot steam hot parts and surfaces that can be touched Warning label W26 Colors yellow black Hot s...

Page 8: ...g Cascade parameter can be called in and modified Heater wattage at 230 V kW 3 1 C U cooling unit Temperature IntAct Cooling capacity at 2 l min flow of cooling water C kW 350 250 150 75 12 8 4 1 Pressure pump Max pressure max at 0 liters bar 0 8 1 2 Flow rate max at 0 bar l min 14 18 Electrical connections See page 9 Filling volume litre 2 Overall dimensions WxDxH M1 Cm 25x25x18 25x25x18 Overall ...

Page 9: ...e warning function optical audible in intervals Supervision of the working sensor plausibility control Reciprocal sensor monitoring between working and safety sensors difference 100 K Alarm indication optical audible permanent Environmental conditions according to IEC 61 010 1 Use only indoor Altitude up to 2000 m normal zero Ambient temperature see Technical specifications Air humidity Max rel hu...

Page 10: ...inless steel Chlorinated water will cause pitting corrosion in heat exchangers made of stainless steel Due to their corrosive characteristics distilled water and deionized water are unsuitable and will cause corrosion of the bath Due to its corrosive characteristics sea water is not suitable Due to its microbiological bacterial components which settle in the heat exchanger untreated and unpurified...

Page 11: ...r switch illuminated 2 Start stop key 3 Working temperature T 4 Key for automatic filling and aeration 5 High temperature warning limit 6 Low temperature warning limit 7 Safety temperature 8 Adjustable excess temperature protection safety temperature 9 Control type internal external control ...

Page 12: ... Internal or external actual value Line 3 Heating power in Line 4 Control type internal external control 13 MENU key for selecting the menu functions 14 Cursor keys Select menu items 15 P key Selecting parameters 16 Numeral keypad numerals 0 to 9 minus decimal point 17 Enter key 1 Store value parameter 2 Next lower menu level 18 Escape key 1 Cancel entries 2 Return to a higher menu level 19 EXT So...

Page 13: ...AND BY Stand by input for external emergency switch off 33 ALARM Alarm output for external alarm signal 35 Control exit Connector for control cable of circulator HT30 36 Mains circuit breakers resettable 16 A or Mains fuses fuse holder with fein wire fuses T16A 37 Mains circuit breakers resettable Fuses 4 A for C U cooling unit 38 Mains power cable with plug 16 A M P 4 A M P ...

Page 14: ...rating controls and functional elements 14 HT30 High Temperature Circulator with C U cooling unit option Front view Cold zone Cooling zone Heating zone Rear view Presentation Cooling unit divided from HT30 ...

Page 15: ...he C U cooling unit 10 IN inlet OUT outlet 48 Overflow connector 15 5 G Internal thread 49 Inert gas connector 10 M8x1 Internal thread 50 Pump connector for external temperatur application Return M16x1 51 Pump connector for external temperatur application Feed M16x1 52 Pump connector for C U cooling unit Return M16x1 Cooling circuit 53 Pump connector for C U cooling unit Feed M16x1 Cooling circuit...

Page 16: ...usage tips and other useful information 4 3 Safety instructions Follow the safety recommendations to prevent damage to persons or property Further the valid safety instructions for working places must be followed Only connect the unit to a power socket with earthing contact PE protective earth The power supply plug serves as safe disconnecting device from the line and must be always freely accessi...

Page 17: ...ds in a reactor constitutes normal temperature system practice We do not know which substances are contained within these vessels Many substances are inflammable easily ignited or explosive hazardous to health environmentally unsafe i e dangerous The user alone is responsible for the handling of these substances The following questions shall help to recognize possible dangers and to reduce the ris...

Page 18: ...ted manually The 5 graded level display should therefore be observed whenver refilling If the bath liquid thickens or cracks the instrument should be cleaned and checked by qualified personnel Caution Escape of vapors gas The necessity of degassing requires that a closed system is not entirely sealed Especially at increased working temperatures vapor gas may escape Ensure sufficient ventilation at...

Page 19: ...l position A wall distance of at least 15 cm must be maintained for ventilation allowing internal heat to be conducted away from the unit JULABO Order No 9790100 C U cooling unit M1 remote control electronics The unit should be set up at a dry location Place the unit in an upright position and do not obstruct the ventilation Ambient temperatures above 40 C result in a failure of the unit Do not se...

Page 20: ...cooling can become active see 8 6 Limits Installation of the C U unit JULABO Order No 9790100 C U cooling unit Use the leader pins 62 to fix the assembly sheet 60 into the base 61 of the circulator and fasten with hexagon screws 63 Push the C U cooling unit to the circulator and screw it tightly at the points 64 Connect the cooling circulation for the oil 52 53 open end wrench SW19 When doing this...

Page 21: ...ans of tubes 8 mm ID Fix the control cable 56 at the control exit 56a and srew tightly Adapter to reduce the pump pressure JULABO Order No 8 970 802 With this adapter the pump pressure at the pump connection 51 can be reduced from 1 2 bar to 0 8 bar 0 1 Assembly Fix the adapter to reduce the pump pressure to the pump connections 50 51 open end wrench a f 19 Notice When using pressure sensitive gla...

Page 22: ... oxygen Effects 20 9 Normal 19 5 Statutory minimum concentration in the USA 15 19 5 Capacity to work falls initial symptoms including cardiac pulmonary or circulation problems 17 Statutory minimum concentration in Germany 12 15 Pulse and respiration rate increased judgment impaired 10 12 Further increase in pulse and respiration rate dizziness judgment impaired blue lips 8 10 Nausea unconsciousnes...

Page 23: ...o liability for use of other bath fluids ATTENTION The maximum permissible viscosity is 30 mm2 s Caution The use of water in purified or unpurified form is not allowed Examples Tap water distilled water water glycol mixture CaCl2 brine Important notice Tempering liquid The circulator can only be operated in closed tempering circuits The contact of the tempering liquid with atmospherical oxygen onl...

Page 24: ...of the counter cooling e g through broken tubes can cause higher temperatures in the cooling zone Due to a damaged tempering tube hot tempering liquid can be pumped out within a short time These are possible results Danger of fire Danger of explosion Burning of people s skin Difficulties in breathing due to hot atmosphere JULABO supplies the metal tubes with assembly instructions No 1 950 0013 The...

Page 25: ... a safe disconnecting device from the line and must always be easily accessible Never operate the unit with a damaged mains power cable Regularly check the mains power cables for damage We disclaim all liability for damage caused by incorrect line voltages 5 7 Filling draining Caution The lines of the external system should be well cleaned in order to avoid soil particles sand metal chips from bei...

Page 26: ...ing liquid until two or three segments of the level indication light up The necessary quantity of liquid then is in the tempering system 9 If the minimum level liquid remains under a low level alarm E01 can be caused By a short switching off and switching on again at the mains switch 1 the alarm status is cancelled Afterwards again refill the tempering liquid and operate the key until two or three...

Page 27: ...s one after the other as described in order to get into the degasifying mode or to leave it On the DIALOG DISPLAY LCD the different actions can be followed up 1 MENUE key 1x 2 Enter key 1x 3 Cursor key 5x 4 P key 1x 5 Enter key 1x 6 Now in line 4 of the DIALOG DISPLAY there is the demand to set a temperature value Enter temperature Example 250 C For this operate the following keys With the Enter k...

Page 28: ...opped at any time The degasifying mode can also be left via the menu level Proceeding as point 1 5 Important To avoid switching off due to the excess temperature protection or warning both settings should be checked and if necessary adjusted Operate the setpoint key The MULTI DISPLAY LED shows the present setpoint temperature Example 270 00 C Safety temperature see page 33 Operate the setpoint key...

Page 29: ...80 704 Magnetic valve With assembled C U cooling unit the cooling water is connected to the connections 47 46 The flow of cooling water is controlled automatically HT60 Returnf 52 HT60 Feed 53 Thread M16x1 2 A cooling coil in the C U cooling unit for rapid cool down of the tempering liquid Via the pump connections 52 53 the tempering liquid is led through the CU unit The heat is drained via the co...

Page 30: ...r enters the operating mode activated before switching the programmable controller off keypad control mode manual operation or remote control mode operation via personal computer Selecting the language There are two options for the language of the DIALOG DISPLAY LCD German or English Select the desired language in the MENUE level under the configuration submenu Press the respective keys in the fol...

Page 31: ...t first resend the parameters set via the interface before the circulator may be restarted 7 2 Setting the temperatures This setting may be carried out with the high temperature circulator being in operating state Start or Stop Setting the working temperature T 1 Press the setpoint key The value previously set appears on the DIALOG DISPLAY LCD example 50 00 C A flashing segment indicates that a va...

Page 32: ...y set appeears on the DIALOG DISPLAY LCD example 305 00 C A flashing segment indicates that a value needs to be entered 2 Use the keypad to enter the new value example 240 00 C 3 Press enter to store the value Setting the low temperature limit 1 Press the key 2 Follow the instructions 3 for example 220 00 C Note The warning functions will only be triggered when the actual bath temperature after st...

Page 33: ...ating zone If the temperature of the bath liquid reaches the safety temperature a complete shutdown of the controlled heating device is effected The alarm is indicated by optical and audible signals continuous tone On the MULTI DISPLAY LED and DIALOG DISPLAY LCD appears the error message E 14 Cancel the alarm state see page 55 Recommendation Set the safety temperature at 20 C above the working tem...

Page 34: ...ors and then securely fix the sensor in the external system Switching from internal to external control Press the key in operating state OFF to select the control type The DIALOG DISPLAY LCD indicates the effective control type Press the start stop key Temperature indication Both actual temperatures are indicated at the same time 1 on the MULTI DISPLAY LED 2 on the DIALOG DISPLAY LCD Press the key...

Page 35: ...HT30 M1 35 8 Menu functions Press the MENU key to enter the menu level Use the up down cursor keys to select the desired submenu and press enter Press escape to return to the previous menu level ...

Page 36: ... identification The control parameters ascertained during the last identification are used for control purposes once single identification The High Temperature Circulator performs a single identification of the controlled system after start After the identification process the parameter is automatically set to off always continual identification The High Temperature Circulator performs an identifi...

Page 37: ...PROG 31 through an external programmer RS232 via the serial RS232 RS485 interface 30 through a PC or superordinated data system Autostart Note The M1control electronic has been configured and supplied by JULABO according to N A M U R recommendations This means for the start mode that the unit must enter a safe operating state after a power failure non automatic start mode This safe operating state...

Page 38: ...r emergency switch off connector see page 56 Possible parameters no stand by input is ignored yes stand by input is active Language There are two options for the language of the DIALOG DISPLAY LCD German or English Possible parameters German deutsch English engl Degasifying During the filling process the pump fluidizes air bubbles into the tempering liquid In an automatic degasifying mode those an...

Page 39: ...e parameter and press enter Press escape to return to the previous menu level Proportional range Xp The proportional range is the range below the selected temperature value in wich the the control circuit reduces the heating power from 100 to 0 Resetting time Tn Integral component Compensation of the remaining control deviation due to proportional regulation An insufficient resetting time may caus...

Page 40: ... parameter affects the march of temperature only in case of internal control see page 34 Adjustable parameter standard The temperature rises quicker however can overshoot up to 5 If a ramp is defined the march of temperature often follows this ramp aperiod The temperature rises chronologically without overshoot With both adjustments a sufficient temperature stability is reached after approximately...

Page 41: ...rameters The heat up curve reveals inappropriate control settings example working temperature T optimum setting Inappropriate settings may produce the following heat up curves Xp too low C t Tv Tn too low Xp too high or Tv too high Tv Tn too high or Xp too high ...

Page 42: ...ng a program from the operating status The programmer is started with the Start key and the bath is heated to the desired temperature for example 100 C At the end of the program the programmer switches to the operating status and holds the bath temperature stable at 100 00 C Press enter to select the submenu Profile Start Use the up down cursor keys to select the desired option A flashing segment ...

Page 43: ...rature Circulator switches to waiting mode and a flashing line wait appears on the DIALOG DISPLAY LCD The start time and actual time are permanently indicated on the display Indication after starting the profile DIALOG DISPLAY LCD 1st line Setpoint of the programmer 2nd line Actual temperature value at internal control IntAct xxx xx at external control ExtAct xxx xx 3rd line Selected profile and t...

Page 44: ...g the contact AK The programmer switches to the waiting position while displaying this condition with a blinking LCD display Important To achieve this the Stand by condition must first be activated and the Autostart function turned on see page 38 Warning Following a power interruption it would be possible in this condition for the programmer to restart automatically The safety and warning function...

Page 45: ... down cursor keys to select the desired option Then press enter to open A flashing segment indicates that a number or value needs to be entered Edit Compile profiles Display sections Delete Delete sections Print Print a programmed profile Set clock Set the real time on the programmable controller Examples Setting the clock The integrated clock provides the flexibility to start a profile at any dat...

Page 46: ...rmation for target temperature and time period are considered It makes sense to leave out section numbers in the profile in order to use them later for corrections in the profile Important If a time of 00 00 is set for a profile the profile is continued with the next section only after the setpoint temperature 0 2 C is reached Press escape to return to the previous menu level Example Step No 1 3 5...

Page 47: ... level Profile 1 Step 0 not defined Step 1 50 00 08 Step 2 not defined Step 3 50 00 02 Step 4 not defined Step 5 100 00 10 Step 6 100 01 05 Step 7 not defined Step 8 not defined Step 9 80 00 10 Step 10 not defined Step 11 80 00 05 Step 12 not defined Step 13 not defined Step 14 20 00 30 Step 15 not defined etc Print Each profile may be printed via the serial interface for control or documentation ...

Page 48: ...point active setpoint temperature T integr programmer ext programmer ActInt internal actual temperature value bath temperature ActExtexternal actual temperature value external sensor Power periodic or intermittent heating or cooling Then select the display size for channels 1 to 3 Channel 1 and 2 voltage outputs Assign the voltage values of 0 V to the lowest and 10 V to the highest necessary tempe...

Page 49: ...gnal of the external programmer Voltage voltage input Current current input Select the desired input value with the P key and set with enter L Value Setting the LOW value Adjust and set the lowest desired working temperature on the programmer e g 0 C Enter this same temperature on the programmable controller by pressing the appropriate buttons on the keypad and press enter to set H Value Setting t...

Page 50: ... value 1 Adjust and set the highest desired value on the voltage or current source resp Example A 10 V 2 Assign an upper temperature threshold value to this adjusted voltage current value by pressing the appropriate buttons on the keypad of the programmable controller Example A 200 C and set by pressing enter Return to the standard display by pressing escape Example B in the diagram serves to illu...

Page 51: ... on the circulator Heating and cooling power of the programmable controller are adjustable 100 corresponds to the values in the technical specifications of the equipment Select the submenu Limits with enter Select the desired option with the up down cursor keys A flashing digit indicates that a value needs to be entered IntMax see working temperature range page 8 IntMin see working temperature ran...

Page 52: ...e even odd Handshake software handshake hardware handshake Address 0 to 127 Press the P key to select the desired parameter and set with enter Return to the previous menu level with escape Factory settings see 11 1 8 8 Sensors ATC Absolute Temperature Calibration Select the submenu Temp Sensor with enter Select the desired option with the up down cursor keys A flashing digit indicates that a value...

Page 53: ...actor always affects the actual working temperature even when set via the interface connection ext Pt100 Circulator TT External sensor TPt100 ATC Ext serves calibration of an external Pt100 sensor Immerse the Pt100 sensor in the circulator bath tank and allow the bath temperature to stabilize at 50 C for example Read the temperatures of the factory calibrated circulator TT and the external Pt100 s...

Page 54: ... unit Cable of the working temperature sensor interrupted or short circuited Defect of the working or safety temperature sensor Working temperature and safety sensors report a temperature difference of more than 100 K Other errors I2C BUS errors Error in A D converter Safety sensor defect The safety temperature value lies below the working temperature setpoint Set the safety temperature to a highe...

Page 55: ... service station Mains Fuses Mains circuit breakers resettable for the circulator 16 A and the CU unit 4 A on the rear of the housing are safety machines Mains Fuses The mains fuses 36 on the rear of the unit may easily be exchanged as shown on the left T 16 A Warning Before exchanging the fuses turn off the mains power switch and disconnect the power plug from the mains socket Only use fine fuses...

Page 56: ...ignal GND Pin 8 B Pins 1 2 4 6 7 9 Reserved do not use Accessories Order No Description 8 980 073 RS232 interface cable 9 pol 9 pol 2 5 m 8 900 110 USB interface adapter cable REG E PROG Programmer input temperature recorder output 31 Analog inputs outputs see page 48 Pin Signal 1 Voltage output Channel 1 0 10 V 2 Voltage output Channel 2 0 10 V 3 GND for outputs 0 V 4 Programmer input EPROG 0 to ...

Page 57: ... the STAND BY input The Stand by function can be used in conjunction with the AUTOSTART feature see page 37 1 If the Autostart function is NOT turned ON the Stand by input should be used as described above 2 If the Autostart funcion is enabled the instrument will revert back to the original method of entering the setpoint i e keypad RS232 Analog input etc Entering the setpoint with the keypad for ...

Page 58: ...he option Setpoint to define the interface see page 37 The interface parameters are set by selecting the submenu Interface on the circulator Normally this is a one time only adjustment Selecting and setting menu items see page 52 Factory settings RS232 BAUDRATE 4800 bauds PARITY even parity HANDSHAKE Protocol RTS CTS hardware handshake Data bits 7 Stop bit 1 Like all parameters which can be entere...

Page 59: ...ommands to the circulator slave The circulator sends data including error messages only when the computer sends a query A transfer sequence consists of address RS485 interface only command space Hex 20 parameter the character separating decimals in a group is the period end of file Hex 0D The commands are divided into in or out commands in commands asking for parameters to be displayed out command...

Page 60: ... the safety sensor in_pv_04 1 8 Liquid level indication in_pv_05 none Temperature value registered by the safety sensor 1 in_pv_06 none Temperature value registered by the safety sensor 2 only HT60 in_pv_07 none Temperature value registered by the safety sensor 3 only HT60 in_sp_00 none Working temperature T in_sp_03 none High temperature warning limit in_sp_04 none Low temperature warning limit i...

Page 61: ...nal slope in_par_03 none Time constant of the internal bath in_par_04 none Band limiting max difference between the temperatures in the internal bath and external system in_par_06 none Xp control parameter of the internal controller in_par_07 none Tn control parameter of the internal controller in_par_08 none Tv control parameter of the internal controller in_par_09 none Xp control parameter of th...

Page 62: ...warning limit out_hil_00 xxx Set the desired maximum cooling power 0 to 100 This adjustment is required only for proportionally controlled refrigerated circulators out_hil_01 xxx Set the desired maximum heating power 10 to 100 out_par_04 xxx Band limiting during external control Setting the maximum difference between the temperatures in the internal bath and external system out_par_06 xxx Xp contr...

Page 63: ...vel alarm 02 COOLING UNIT ALARM Failure of one or both temperature sensors of the C U cooling unit 03 EXCESS TEMPERATURE WARNING High temperature warning 04 LOW TEMPERATURE WARNING Low temperature warning 05 WORKING SENSOR ALARM Working temperature sensor short circuited or interrupted 06 SENSOR DIFFERENCE ALARM Sensor difference alarm Working temperature and safety sensors report a temperature di...

Page 64: ...ntrol electronics Mx 33 SAFETY SENSOR 1 ALARM Safety sensor 1 Cable of the safety sensor 1 interrupted or short circuited 34 SAFETY SENSOR 2 ALARM Safety sensor 2 Cable of the safety sensor 2 interrupted or short circuited 35 SAFETY SENSOR 3 ALARM Safety sensor 3 Cable of the safety sensor 3 interrupted or short circuited 36 SENSOR COOLING ZONE ALARM Safety sensor in the cooling zone Cable of the ...

Page 65: ...t damage the unit The circulator is designed for continuous operation under normal conditions Periodic maintenance is not required Repairs Before asking for a service technician or returning a JULABO circulator for repair please contact an authorized JULABO service station When returning the unit Empty completely remove the expansion tank close tightly the connections with nuts and closing caps Ca...

Page 66: ...Liability Buyer s sole and exclusive remedy under the Initial Warranty is strictly limited in Seller s sole discretion to either i repairing defective parts or ii replacing defective parts In either case the warranty period for the product receiving a repaired or replaced part pursuant to the terms of the Initial Warranty shall not be extended All repairs or replacements performed by Seller pursua...

Page 67: ...shall be governed by the substantive laws of the Commonwealth of Pennsylvania without regard to its principles of conflicts of law 8 Waiver Any failure of the part of Seller to insist on strict compliance with the Warranty Provisions shall no way constitute a waiver of such right No claim or rights arising out of a breach of the Warranty Provisions by Buyer may be discharged in whole or in part by...

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