Vaisala HMT360Series Скачать руководство пользователя

Страница: 41 / 67

Serial interface _____________________________________________________________________

Vaisala _________________________________________________________________________ 41

The transmitter asks and measures relative humidity and calculates the
calibration coefficients, for example:

>CRH

↵

1.82 1. ref

↵

Press any key when ready...

↵

74.22

2. ref

? 75

↵

OK
>

The

indicates that the calibration has succeeded.

Temperature adjustment

↵

The transmitter asks and measures temperature readings and calculates
the calibration coefficients, for example:

>CT

↵

0.81

1. ref

0.5

↵

Press any key when ready...

↵

: 99.12

ref

99.5

↵

OK
>

The

indicates that the calibration has succeeded. When performing

one-point calibration press only

↵

for 2. reference.

Analog output calibration

Connect the HMT360 to a multimeter. Give the following command.

ACAL

↵

Disconnect the serial cable from the transmitter while reading the

multimeter value for the CH1 (I1).

Reconnect the serial cable. Type the multimeter reading and press

↵

Type the higher current multimeter reading and press

↵

>ACAL

↵

Ch1 I1

(mA) ?

4.846

↵

Ch1 I2

(mA) ?

19.987

↵

Содержание HMT360Series

Страница 1: ...HMT360 Series Transmitters for Hazardous Areas USER S GUIDE M010056EN D May 2004...

Страница 2: ...00421 Helsinki Finland Visit our Internet pages at http www vaisala com Vaisala 2004 No part of this manual may be reproduced in any form or by any means electronic or mechanical including photocopyin...

Страница 3: ...s 12 Checking the temperature reading 12 Mounting the transmitter 13 Mounting the probes 14 The HMP362 small pressure tight probe 14 The HMP363 probe for confined spaces 15 The HMP365 probe for high t...

Страница 4: ...INTERFACE 38 Serial communication settings 38 Selecting the analog outputs 39 Scaling the analog outputs 40 Adjustment commands 40 Relative humidity adjustment 40 Temperature adjustment 41 Analog outp...

Страница 5: ...t 51 CHAPTER 11 SPECIFICATIONS 52 Performance 52 Calculated variables available typical ranges 53 Outputs 54 Classification with current outputs 54 General 55 Probes 56 Options and accessories 56 ACCU...

Страница 6: ...nt data could be lost NOTE Note highlights important information on using the product ESD Protection Electrostatic Discharge ESD can cause immediate or latent damage to electronic circuits Vaisala pro...

Страница 7: ...escription U336en 1 1 1st version March 1999 M010056en A 2nd version January 2001 M010056en B 3rd version March 2002 M010056en C 4th version November 2002 M010056EN D 5th version May 2004 Warranty For...

Страница 8: ...re in hazardous areas requiring EX classification Connect the transmitter always via galvanic isolators or zener barriers in hazardous environments Output quantities The transmitter has a local displa...

Страница 9: ...ee page 44 for detailed information All other maintenance is performed at the factory If a transmitter is damaged contact Vaisala or Vaisala distributor and send the instrument to the addresses below...

Страница 10: ...for hazardous locations Marking EEx ia IIC T4 at temperature range 20 60 C and pressure range 0 8 1 1 bar US requirements FM FM approved for Classes I II III Division 1 Groups A B C D E F G and Divisi...

Страница 11: ...or conductive tape or mount the probe cable in a metal conduit Assure that the conductive shield fulfils requirements of the standard EN50284 resistance less than 1 G and make sure that it can not co...

Страница 12: ...this installation is not possible and the sensor head must be installed through the wall e g with a flange the sensor head and the cable must be insulated carefully Checking the temperature reading Th...

Страница 13: ...e wall with 4 screws 2 Press down the transmitter so that it slides along the rails of the mounting plate 3 Fasten the transmitter to the mounting plate with the Allen screw 4 The probe can be detache...

Страница 14: ...may alter the humidity calibration of the transmitter The HMP362 small pressure tight probe The HMP362 probe is a small pressure tight probe equipped with installation flange It is suitable for dewpoi...

Страница 15: ...ar into the transmitter memory via the serial line see page 42 or via the display keypad see page 33 The HMP363 probe for confined spaces The HMP363 is a small size general purpose probe suitable for...

Страница 16: ...outside of the duct This can cause incorrect humidity readings FIGURE 3 4 Mounting the HMP365 sensor head in a duct or channel HMP364 for pressurized spaces The HMP364 pressure tight probe is designe...

Страница 17: ...Nm 110 7 ft lbs 3 Insert the body of the sensor head into the fitting screw and screw the nut manually to the fitting screw until the connection feels tight 4 Mark both the fitting screw and the nut h...

Страница 18: ...__________________________________________________ 18 NOTE If the HMP364 is installed in a process with a pressure differing from normal atmospheric pressure please enter the pressure value of the pro...

Страница 19: ...ewpoint measurements in natural gas When the probe is used in a pressurized pipeline or in liquids e g feeder routes the sensor head should preferably be installed directly in the process through a ba...

Страница 20: ...s tight and may prevent it from going through the clasp nut Tightening the clasp nut 1 Adjust the probe to a suitable depth according to the type of installation 2 Tighten the clasp nut first manually...

Страница 21: ...head to pressurized process or pipeline is to install it through the ball valve assembly This installation makes it unnecessary to empty or shut down the process for installing or removing the sensor...

Страница 22: ...rocess flow NOTE Installation or removing the probe through a ball valve assembly is possible without shutting the process when the pressure is less than 10 bar With 10 40 bar pressures you must shut...

Страница 23: ...gure 3 2 item 7 3 Connect the unpowered power supply wires to the connectors CH1 humidity and CH2 temperature Both channels require an own power supply NOTE As CH1 is a main output the transmitter doe...

Страница 24: ...be short circuited see figure 4 3 Figures 4 1 and 4 2 present examples of galvanic isolators and zener barrier connections only CH1 connected Maximum load calculation for the barrier Always check the...

Страница 25: ..._______________ 25 HMT360 connected to a galvanic isolator a current signal controller b voltage signal controller FIGURE 4 1 HMT360 connected to a galvanic isolator CH 1 CH 2 Rl U Power Supply Galvan...

Страница 26: ...____________________________ 26 HMT360 connected to a zener barrier a current signal controller b voltage signal controller FIGURE 4 2 HMT360 connected to a zener barrier CH 1 CH 2 Power Supply Zener...

Страница 27: ...ic isolator FIGURE 4 4 STAHL 9001 51 280 091 141 zener barrier Make the connection between the terminals always when using a galvanic isolator STAHL 9160 13 11 11 Ch2 HMT360 Connection HAZARDOUS AREA...

Страница 28: ...ollow the local requirements Use at least 4 mm2 grounding cable when grounding the transmitter or barrier Note that the allowed resistance between barrier and system ground must be less than 1 ohm See...

Страница 29: ...ng turn the transmitter s internal CALIBRATION ENABLED DISABLED dip switch to position ENABLED up Adjust the pressure reading with buttons and on the display cover the adjustment step is 100 hPa Ackno...

Страница 30: ...e not restored the LED indicator keeps blinking Dip switch functions The table below is also printed on the protection board n o p q r s t u n ANALOG OUTPUT TEST ON OFF if you turn the switch to ON po...

Страница 31: ...d position according to the table printed on the protective cover r OUTPUT QUANTITIES determines whether the output units are metric down on non metric s t and u SELECT OUTPUT QUANTITIES with the thre...

Страница 32: ...isplay shows ERROR LED on the cover is lit and no calibration is going on transmitters without a display In the case of error Check that the sensor is connected properly Check if there is condensed wa...

Страница 33: ...sensor and probe are dry set the filter back on the probe NOTE Do not touch the sensor surface especially if removing the HUMICAP sensor from the probe Only dipping to de ionized water or IPA is allow...

Страница 34: ...ng ratio and wet bulb calculations In dewpoint transmitters natural gas applications the process pressure in the measurement point is required to achieve the specified accuracy To modify the pressure...

Страница 35: ...ED down When the OUTPUT QUANTITIES METRIC NON METRIC dip switch is in the METRIC down position the available quantities are dew frost point temperature Td C parts per million ppm and absolute humidity...

Страница 36: ...ature T A D F H N 2 dewpoint temperature Td D N 3 absolute humidity a D 4 mixing ratio x D 5 wet bulb temperature Tw D 6 volume concentration ppm H N 7 water activity aw H F 8 relative humidity of sat...

Страница 37: ...buttons and Acknowledge the value with button E and a text similar to the following appears Numbers on the second line indicate the high end scaling of channel 1 The text SET HI on the lower left hand...

Страница 38: ...not able to operate with 4 mA Therefore it is recommended to use serial communication only temporarily for changing settings or for calibrating the transmitter in a safe area With serial port the min...

Страница 39: ...return Selecting the analog outputs Turn the internal dip switch CALIBRATION ENABLED DISABLED to ON position before the selecting the analog outputs and return it to OFF position after selecting ASEL...

Страница 40: ...b upper limit of the quantity Example Scaling the relative humidity SRH 0 100 RH lo 0 00 RH RH hi 100 00 RH Exception When you have natural gas transmitter and you scale the quantity of water content...

Страница 41: ...ter asks and measures temperature readings and calculates the calibration coefficients for example CT T 0 81 1 ref 0 5 Press any key when ready T 99 12 2 ref 99 5 OK The OK indicates that the calibrat...

Страница 42: ...value to be set for channel 2 mA For example ITEST 8 12 8 000 3F8 12 000 70O ITEST 6 349 25A 19 001 E93 The set current values remain valid until you give the command ITEST without readings With this...

Страница 43: ...intrv 10 min Setting the ambient pressure for calculations Turn the internal dip switch CALIBRATION ENABLED DISABLED to ON position before setting the pressure and return it to OFF position after sett...

Страница 44: ...valve set available The accuracy of the dewpoint measurement is affected by pressure in the measurement chamber The actual pressure in the sampling cell shall be set to the transmitter by using the se...

Страница 45: ...ion and adjustment see contact information on page 9 HMT360 for natural gas shall be adjusted always in Vaisala Service Center Calibration and adjustment by the user Note that HMT360 for natural gas c...

Страница 46: ...nd multimeter for calibration 1 Unfasten the screws and open the cover 2 Switch the transmitter off with the ON OFF switch 3 Disconnect the flat cable by lifting it carefully e g with a screw driver 4...

Страница 47: ...ous area the multimeter is connected to the terminals A1 A2 and B1 B2 Use only an approved multimeter WARNING The power supply connectors C1 and C2 MUST NOT be used in hazardous areas For calibration...

Страница 48: ...the calibration dip switch to ENABLED position and select RH calibration by using switches 3 and 4 see Chapter 5 Dip switch functions Remove the filter and insert the probe head into a measurement hol...

Страница 49: ..._________________________________________ Vaisala _________________________________________________________________________ 49 FIGURE 9 3 Display chart of the automatic calibration procedure Calibrati...

Страница 50: ...mitter display to monitor the stabilization Press the buttons and to adjust the display reading or multimeter reading to correspond the reference value when using a multimeter calculate the current va...

Страница 51: ...e a high quality standard for calibrating the temperature NOTE If you use serial commands please refer to page 40 Set the calibration dip switch to position ENABLED up Set the calibration dip switches...

Страница 52: ...dity standards 1 RH 0 90 RH 2 RH 90 100 RH salt solutions 2 RH 0 90 RH ASTM E104 85 3 RH 90 100 RH Response time 90 at 20 C in still air with sintered filter 15 seconds Sensors HUMICAP 180 for typical...

Страница 53: ...ed against high quality certified humidity standards 0 01 0 0 9 0 02 0 9 1 0 when calibrated against salt solutions ASTM E104 85 0 02 0 0 9 0 03 0 9 1 0 Response time 90 at 20 C in still oil stainless...

Страница 54: ...A one standard one optional Typical accuracy of analog Outputs at 20 C 0 05 full scale Typical temperature dependence of analog outputs 0 005 C full scale RS232C serial output for service use connecto...

Страница 55: ...Vmax 28 VDC Ii 100 mA Pi 0 7 W Ci 1nF Li 0 mH General Operating voltage 12 28 V with serial port service mode 15 28 V Connections screw terminals 0 33 2 0 mm2 wires AWG 14 22 Cable bushing Pg11 5 12m...

Страница 56: ...Pa 0 167 bar HMP363 Probe confined spaces Temperature range 40 120 C HMP364 Probe high pressures Temperature range 40 180 C Pressure range 0 10 MPa 0 100 bar HMP365 Probe high temperatures Temperature...

Страница 57: ...Accuracy of the calculated variables depend on the calibration accuracy of the humidity and temperature sensors here the accuracy are given for 2 RH and 0 2 C Accuracy of dewpoint temperature C Relat...

Страница 58: ...0 29 0 29 0 29 0 30 0 30 0 31 0 31 20 0 45 0 45 0 45 0 44 0 44 0 44 0 43 0 43 0 42 0 42 40 0 84 0 77 0 72 0 67 0 64 0 61 0 58 0 56 0 54 0 52 60 1 45 1 20 1 03 0 91 0 83 0 76 0 71 0 67 0 63 0 60 80 2...

Страница 59: ..._______________________________________________________________ 59 APPENDIX 1 DIMENSIONS HMT361 HMP362 Flange intersection Sample cell HMP302SC 36 1 42 32 1 26 41 1 61 M6 12 0 47 1 8 27 NPT 9 0 35 7 0...

Страница 60: ..._________________________________________________________________________________ Vaisala _________________________________________________________________________ 60 HMP363 HMP364 HMP365 HMP368...

Страница 61: ..._______________________________________________________________________________ Vaisala _________________________________________________________________________ 61 Mounting plate Rain shield 180 80 1...

Страница 62: ..._________________________________________________________________________ Vaisala _________________________________________________________________________ 62 Protection cover 208 224 160 184 8 2 189...

Страница 63: ...ivision 1 groups A G and Division 2 Groups A D F and G Safety factors for HMT360 series transmitters are Vmax 28 V Imax 100 mA Ci 1 nF Li 0 Pi 0 7 W NOTE 1 Barrier installation must be completed in ac...

Страница 64: ...m 8 Maximum safe area voltage is 250V p HMT360 series transmitters are approved for use in Division 1 and 2 Class I Groups A B C and D Division 1 and 2 Class II Group G and coal dust Division 1 and 2...

Страница 65: ..._________________________________________________________________________________ Vaisala _________________________________________________________________________ 65 CERTIFICATES...

Страница 66: ..._________________________________________________________________________________ Vaisala _________________________________________________________________________ 66...

Страница 67: ..._________________________________________________________________________________ Vaisala _________________________________________________________________________ 67...

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