Zamkatimu kubisa
1 Zida za PCE PCE-HT 72 Data Logger ya Kutentha ndi Chinyezi
2 Zambiri Zamalonda
3 Malangizo Ogwiritsira Ntchito Zogulitsa
4 Zolemba zachitetezo
5 Zofotokozera
6 Kuchuluka kwa kutumiza
7 Kufotokozera kwachipangizo
8 Kufotokozera
9 Ntchito Yofunika
10 Lowetsani / sinthani batire
11 Mapulogalamu
12 Chithunzi cha Datalogger
13 Chiwonetsero chotsala
14 Chotsikitsitsa ndi chapamwamba
15 Kutulutsa kwa data kudzera pa PDF
16 Chiwonetsero cha mawonekedwe a LED
17 Pangani kusintha kwa firmware
18 Chotsani zonse zosungidwa
19 Contact
20 Kutaya
21 Zambiri za PCE Instruments
22 Zolemba / Zothandizira
22.1 Maumboni
23 Zolemba Zogwirizana

PCE-Instruments-LOGO

Zida za PCE PCE-HT 72 Data Logger ya Kutentha ndi Chinyezi

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-ndi-Humidity-PRODUCT

Zambiri Zamalonda

  • Zofotokozera
    • Ntchito yoyezera: Kutentha, Chinyezi cha mpweya
    • Kuyeza mtundu: Kutentha (0 ... 100 °C), chinyezi cha mpweya (0 ... 100 % RH)
    • Kusamvana: N / A
    • Kulondola: N / A
    • Memory: N / A
    • Kuyeza mtengo / nthawi yosungira: N / A
    • Poyimitsa: N / A
    • Chiwonetsero: N / A
    • Onetsani: N / A
    • Magetsi: N / A
    • Chiyankhulo: N / A
    • Makulidwe: N / A
    • Kulemera kwake: N / A

Malangizo Ogwiritsira Ntchito Zogulitsa

  • Zolemba zachitetezo
    • Chonde werengani bukuli mosamala komanso kwathunthu musanagwiritse ntchito chipangizochi koyamba. Chipangizocho chingagwiritsidwe ntchito ndi ogwira ntchito oyenerera ndikukonzedwa ndi PCE Instruments ogwira ntchito. Zowonongeka kapena kuvulala komwe kumabwera chifukwa chosatsatira bukuli sikuphatikizidwa m'mavuto athu ndipo sikukuperekedwa ndi chitsimikizo chathu.
    • Sitikuganiza kuti tili ndi vuto lazosindikiza kapena zolakwika zina zilizonse m'bukuli. Timalozera kuzinthu zathu zonse zotsimikizira zomwe zingapezeke pamabizinesi athu. Ngati muli ndi mafunso, chonde lemberani PCE Instruments. Mauthengawa akupezeka kumapeto kwa bukuli.
  • Chithunzi cha pulogalamuyo
    • Kuti mumvetse chithunzi cha pulogalamuyo, chonde onani buku la ogwiritsa ntchito kuti mudziwe zambiri komanso mafotokozedwe.
  • Zokonda pafakitale
  • Kuti mubwezeretse choloja cha data ku zoikamo za fakitale, chonde tsatirani izi:
  • Kulumikizana ndi Kutaya
    • Ngati muli ndi mafunso ena kapena mukufuna thandizo, chonde lemberani PCE Instruments. Mauthengawa akupezeka kumapeto kwa bukuli.
  • Kuchuluka kwa Kutumiza
    • 1 x PCE-HT72
    • 1 x Chingwe chapamanja
    • 1 x CR2032 batire
    • 1 x Buku la ogwiritsa ntchito
  • Mafunso Ofunsidwa Kawirikawiri (FAQ)
    • Funso 1: Kodi ndingasinthe bwanji mayunitsi oyezera?
      • Yankho: Kuti musinthe mayunitsi oyezera, chonde onani gawo la "Unit Settings" patsamba X.
    • Funso 2: Kodi ndingalumikize cholowera deta ku kompyuta?
      • Yankho: Inde, cholembera data chikhoza kulumikizidwa ndi kompyuta kudzera pa chingwe cholumikizira choperekedwa. Chonde onani gawo la "Kulumikizana ndi Kompyuta" patsamba Y kuti mudziwe zambiri.
    • Funso 3: Kodi batire limakhala nthawi yayitali bwanji?
      • Yankho: Moyo wa batri umatengera zinthu zosiyanasiyana monga kuchuluka kwa kagwiritsidwe ntchito ndi makonda. Pa avareji, batire ya CR2032 yomwe ikuphatikizidwa pakubweretsa imatha pafupifupi miyezi Z.

Zolemba zachitetezo

Chonde werengani bukuli mosamala komanso kwathunthu musanagwiritse ntchito chipangizochi koyamba. Chipangizocho chingagwiritsidwe ntchito ndi ogwira ntchito oyenerera ndikukonzedwa ndi PCE Instruments ogwira ntchito. Zowonongeka kapena kuvulala komwe kumabwera chifukwa chosatsatira bukuli sikuphatikizidwa m'mavuto athu ndipo sikukuperekedwa ndi chitsimikizo chathu.

  • Chipangizocho chiyenera kugwiritsidwa ntchito monga momwe tafotokozera m'bukuli. Ngati atagwiritsidwa ntchito mwanjira ina, izi zitha kubweretsa zoopsa kwa wogwiritsa ntchito komanso kuwonongeka kwa mita.
  • Chidachi chingagwiritsidwe ntchito pokhapokha ngati chilengedwe (kutentha, chinyezi chocheperako, ...) chili mkati mwamigawo yomwe yafotokozedwa muukadaulo. Osawonetsa chipangizocho ku kutentha kwambiri, kuwala kwa dzuwa, chinyezi chambiri kapena chinyezi.
  • Osawonetsa chipangizocho kuti chizigwedezeka kapena kugwedezeka mwamphamvu.
  • Mlanduwu uyenera kutsegulidwa ndi ogwira ntchito oyenerera a PCE Instruments.
  • Musagwiritse ntchito chida pamene manja anu anyowa.
  • Simuyenera kupanga zosintha zaukadaulo pa chipangizocho.
  • Chipangizocho chiyenera kuyeretsedwa kokha ndi malondaamp nsalu. Gwiritsani ntchito pH-neutral cleaner yokha, osagwiritsa ntchito ma abrasives kapena solvents.
  • Chipangizocho chiyenera kugwiritsidwa ntchito ndi zipangizo zochokera ku PCE Instruments kapena zofanana.
  • Musanagwiritse ntchito, yang'anani bokosilo kuti muwone kuwonongeka. Ngati kuwonongeka kulikonse kukuwoneka, musagwiritse ntchito chipangizocho.
  • Musagwiritse ntchito chidacho mumlengalenga mophulika.
  • Mulingo woyezera monga momwe zafotokozedwera zisapitirire muzochitika zilizonse.
  • Kusasunga zolemba zachitetezo kungayambitse kuwonongeka kwa chipangizocho komanso kuvulala kwa wogwiritsa ntchito.
  • Sitikuganiza kuti tili ndi vuto lazosindikiza kapena zolakwika zina zilizonse m'bukuli.
  • Timalozera kuzinthu zathu zonse zotsimikizira zomwe zingapezeke pamabizinesi athu.
  • Ngati muli ndi mafunso chonde lemberani PCE Instruments. Mauthengawa akupezeka kumapeto kwa bukuli.

Zofotokozera

Ntchito yoyezera Muyezo osiyanasiyana Kusamvana Kulondola
Kutentha -30 ... 60 °C 0.1 °C <0 °C: ± 1 °C

<60 °C: ± 0.5 °C
Chinyezi cha mpweya 0 … 100% RH 0.1% RH 0 … 20% RH: 5%

20 … 40% RH: 3.5%

40 … 60% RH: 3%

60 … 80% RH: 3.5%

80 … 100% RH: 5%
Mafotokozedwe ena
Memory 20010 zoyezera
Mulingo woyezera / nthawi yosungira zosinthika 2 s, 5 s, 10 s … 24h
Yambani-kuyima chosinthika, nthawi yomweyo kapena kiyi ikakanizidwa
Chiwonetsero kudzera pa chizindikiro chomwe chili pachiwonetsero
Onetsani Chiwonetsero cha LC
Magetsi CR2032 batire
Chiyankhulo USB
Makulidwe 75 x 35 x 15 mm
Kulemera pafupifupi. 35 g pa

Kuchuluka kwa kutumiza

  • 1 x PCE-HT72
  • 1 x chingwe cha m'manja
  • 1 x CR2032 batire
  • 1 x buku la ogwiritsa ntchito

Pulogalamuyi ikhoza kutsitsidwa apa: https://www.pce-instruments.com/english/download-win_4.htm.

Kufotokozera kwachipangizo

Ayi. Kufotokozera
1 Sensola
2 Onetsani pamene mtengo wamalire wafika, umasonyezedwanso ndi LED yofiira ndi yobiriwira
3 Makiyi ogwirira ntchito
4 Kusintha kwamakina kuti mutsegule nyumbayo
5 Doko la USB kuti mulumikizane ndi kompyuta

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (2)

Kufotokozera

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (3)PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (4)Ntchito Yofunika

Ayi. Kufotokozera
1 Pansi kiyi
2 Kiyi yamakina yotsegulira nyumbayo
3 Lowetsani kiyi

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (5)

Lowetsani / sinthani batire

Kuyika kapena kusintha batire, nyumbayo iyenera kutsegulidwa kaye. Kuti muchite izi, kanikizani batani la makina "1". Ndiye mukhoza kuchotsa nyumba. Tsopano mutha kuyika batri kumbuyo kapena kulisintha ngati kuli kofunikira. Gwiritsani ntchito batire ya CR2450.

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (6)

Chizindikiro cha batri chimakupatsani mwayi kuti muwone mphamvu ya batri yomwe yayikidwapo.

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (7)

Mapulogalamu

Kuti mupange zoikamo, choyamba ikani pulogalamu ya chipangizo choyezera. Kenako gwirizanitsani mita ku kompyuta.

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (8)

Chitani makonda a choloja cha data
Kuti mupange zochunira pano, pitani ku Zikhazikiko. Pansi pa tabu "Datalogger", mutha kupanga zoikamo pa chipangizo choyezera.

Kukhazikitsa Kufotokozera
Nthawi Yapano Nthawi yamakono ya kompyuta yomwe imagwiritsidwa ntchito pojambulira deta ikuwonetsedwa apa.
Start Mode Apa mukhoza kukhazikitsa pamene mita ndi kuyamba kujambula deta. Pamene "Manual" asankhidwa, mukhoza kuyamba kujambula ndi kukanikiza kiyi. "Instant" ikasankhidwa, kujambula kumayamba nthawi yomweyo zosintha zitalembedwa.
Sample Mlingo Apa mutha kukhazikitsa nthawi yopulumutsa.
Max Point Zolemba zambiri zomwe zingatheke kuti chipangizo choyezera chingasunge chikuwonetsedwa apa.
Lembani Nthawi Izi zikuwonetsani kutalika kwa mita yomwe ingajambule deta mpaka kukumbukira kudzaza.
Yambitsani ma alarm apamwamba ndi otsika Yambitsani ntchito ya alarm mtengo poyika bokosilo.
Kutentha / Chinyezi Chokwera Alamu Yotsika Ikani malire a alamu a kutentha ndi chinyezi. "Kutentha" kumayimira muyeso wa kutentha "Chinyezi" chimayimira chinyezi chachifupi Ndi "High Alarm", mumayika malire apamwamba omwe mukufuna. Ndi "Low Alarm", mumayika mtengo womwe mukufuna.
Zina zozungulira za LED Pogwiritsa ntchito ntchitoyi, mumayika nthawi yomwe LED iyenera kuyatsa kuti iwonetse ntchito.
Kutentha Unit Apa mwakhazikitsa gawo la kutentha.
LoggerName: Apa mutha kupereka dzina lolemba data.
Chinyezi: Chinyezi chomwe chilipo pano chikuwonetsedwa apa. Chigawochi sichingasinthidwe.
Zosasintha Mutha kukhazikitsanso zokonda zonse ndi kiyi iyi.
Khazikitsa Dinani batani ili kuti musunge zokonda zonse zomwe mwapanga.
Letsani Mutha kuletsa zosintha ndi batani ili.

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (9)

Zikhazikiko za data zamoyo
Kuti mupange zoikamo za kufalitsa kwa data, pitani ku tabu ya "REAL Time" pazokonda.

Ntchito Kufotokozera
Sampmtengo (s) Apa mumayika kuchuluka kwa kufalitsa.
Max Apa mutha kuyika kuchuluka kwazomwe zikuyenera kuperekedwa.
Kutentha Unit Apa mutha kukhazikitsa gawo la kutentha.
Chinyezi Unit Chipinda chapano cha chinyezi chozungulira chikuwonetsedwa apa. Chigawochi sichingasinthidwe.
Zosasintha Mutha kukonzanso zosintha zonse ndi batani ili.
Khazikitsa Dinani batani ili kuti musunge zokonda zonse zomwe mwapanga.
Letsani Mutha kuletsa zosintha ndi batani ili.

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (10)

Chithunzi cha pulogalamuyo

  • Mutha kusuntha chithunzicho ndi mbewa.
  • Kuti muwonetsetse chithunzicho, sungani kiyi ya "CTRL".
  • Tsopano mutha kuwonera chithunzicho pogwiritsa ntchito gudumu la mpukutu pa mbewa yanu.
  • Mukadina pazithunzi ndi batani lakumanja la mbewa, mudzawona zinthu zambiri.
  • Kupyolera mu "Grafu yokhala ndi zolembera", mfundo za zolemba za data zitha kuwonetsedwa pa graph.

Chithunzi cha Datalogger

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (11)

NTHAWI

Ntchito Kufotokozera
Koperani Grafu imakopereredwa ku buffer
Sungani Chithunzi Monga... Grafu ikhoza kusungidwa mumtundu uliwonse
Kukhazikitsa Tsamba... Apa mutha kupanga zokonda zosindikiza
Sindikizani... Apa mutha kusindikiza graph mwachindunji
Onetsani Makhalidwe Abwino Ngati ntchito "Grafu yokhala ndi zolembera" ikugwira ntchito, miyeso yoyezera imatha kuwonetsedwa kudzera pa "Show Point Values" pomwe cholozera cha mbewa chili pamfundoyi.
Chotsani-Zoom Makulitsidwe amapita sitepe imodzi mmbuyo
Bwezerani Makulitsidwe/Pan Zonse Makulitsidwe onse akonzedwanso
Khazikitsani Sikelo kukhala Yofikira Makulitsidwe akonzedwanso

Yambani ndi kusiya kujambula pamanja

Kuti mugwiritse ntchito manual mode, chitani zotsatirazi:

Ayi. Kufotokozera
1 Choyamba ikani mita pogwiritsa ntchito pulogalamuyo.
2 Pambuyo kukweza, chiwonetsero chimasonyeza "Start mumalowedwe" ndi II.
3 Tsopano dinani batani PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (17) kiyi kwa masekondi awiri kuti muyambe kujambula.
4 Izi zikusonyeza kuti kujambula kwayambika.

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (12)

Kuti mulepheretse kuyezako tsopano, chitani motere:

Ayi. Kufotokozera
1 Apa mukudziwitsidwa kuti kujambula kwayamba.
2 Tsopano mwachidule akanikizire PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (15)kiyi.
3 Chowonetsera tsopano chikuwonetsa "MODE" ndi "ISTOP".
4 Tsopano pezani ndi kugwira PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (17)kiyi.
5 Muyezo wanthawi zonse unayambikanso ndipo chiwonetsero chikuwonetsa PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (23) .

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (13)

Zofunika: Kujambulira kukatha, chipangizo choyezera chiyenera kukonzedwanso. Choncho sizingatheke kuyambiranso kujambula.

Chiwonetsero chotsala

Onetsani nthawi yotsala yojambulira
Ku view yotsalira kujambula nthawi, mwachidule akanikizire PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (15)kiyi pa kujambula. Nthawi yotsala ikuwonetsedwa pansi pa "TIME".

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (16)

Zofunika: Chiwonetserochi sichitengera batire.

Chotsikitsitsa ndi chapamwamba

Mtengo wotsika kwambiri komanso wapamwamba kwambiri
Kuti muwonetse milingo yotsika kwambiri komanso yapamwamba kwambiri, dinani batani PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (17)kiyi mwachidule panthawi yoyezera.

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (18)

Kuti muwonetsenso milingo yoyezedwa, dinani bataniPCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (17) tsegulaninso kapena dikirani kwa mphindi imodzi.

Kutulutsa kwa data kudzera pa PDF

  • Kuti mulandire deta yojambulidwa mwachindunji ngati PDF, zomwe muyenera kuchita ndikulumikiza chida choyezera ku kompyuta. Memory ya data yambiri imawonetsedwa pakompyuta. Kumeneko mukhoza kupeza PDF file mwachindunji.
    • Zofunika: PDF imapangidwa kokha pamene chipangizo choyezera chilumikizidwa. Kutengera kuchuluka kwa data, zitha kutenga pafupifupi mphindi 30 mpaka kukumbukira kwa data ndi PDF file ikuwonetsedwa.
  • Pansi pa "Logger Name:", dzina losungidwa mu pulogalamuyo likuwonetsedwa. Miyezo yokhazikika ya alamu imasungidwanso ku PDF.PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (19) PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (20)

Chiwonetsero cha mawonekedwe a LED

LED Zochita
Kuwala kobiriwira Kujambula kwa data
Kunyezimira kofiira - Mtengo woyezera kunja kwa malire panthawi yojambulira deta

- Mawonekedwe amanja adayamba. Meter ikuyembekezera kuyambika kwa wogwiritsa ntchito

- Memory ndi yodzaza

- Kujambulitsa deta kunathetsedwa ndikukanikiza kiyi
Kuthwanima kawiri kobiriwira - Zokonda zidagwiritsidwa ntchito bwino

- Firmware idagwiritsidwa ntchito bwino

Pangani kusintha kwa firmware

Kuti mukweze firmware, choyamba ikani batire. Tsopano dinani fungulo mwachidulePCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (15). Chiwonetsero chikuwonetsa "mmwamba". Tsopano akanikizire ndi kugwira PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (17)kiyi kwa pafupifupi. Masekondi 5 mpaka "USB" ikuwonekeranso pachiwonetsero. Tsopano gwirizanitsani chida choyesera ku kompyuta. Foda (memory data misa) tsopano ikuwonekera pa kompyuta. Ikani firmware yatsopano pamenepo. Kusintha kumayamba zokha. Pambuyo kulanda ndi unsembe, mukhoza kusagwirizana choyezera chipangizo kompyuta. Ma LED ofiira amawala panthawi yosintha. Izi zimatenga pafupifupi mphindi ziwiri. Pambuyo pakusintha, kuyeza kudzayambiranso mwachizolowezi.PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (21)

Chotsani zonse zosungidwa

  • Kuti mufufute data yonse pa mita, gwirani makiyi PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (15) PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (17)ndikulumikiza cholowera cha data ku kompyuta nthawi yomweyo.
  • Deta tsopano zichotsedwa. Ngati palibe kulumikizana komwe kwakhazikitsidwa mkati mwa mphindi 5, muyenera kukonzanso mita.

Zokonda pafakitale

  • Kuti mukonzenso mita ku zoikamo za fakitale, dinani ndikugwira makiyi PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (15) PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (17)pamene mphamvu yazimitsa.
  • Tsopano sinthani mita mwa kuyika mabatire kapena kulumikiza mita ku PC.
  • LED yobiriwira imayatsa panthawi yokonzanso. Izi zitha kutenga mphindi ziwiri.

Contact

  • Ngati muli ndi mafunso, malingaliro kapena zovuta zaukadaulo, chonde musazengereze kulumikizana nafe.
  • Mupeza zolumikizana nazo kumapeto kwa bukuli.

Kutaya

  • Pakutaya mabatire ku EU, lamulo la 2006/66/EC la Nyumba Yamalamulo ku Europe likugwira ntchito.
  • Chifukwa cha zowononga zomwe zili nazo, mabatire sayenera kutayidwa ngati zinyalala zapakhomo.
  • Ayenera kuperekedwa ku malo osonkhanitsira opangidwira cholinga chimenecho.
  • Kuti titsatire malangizo a EU 2012/19/EU timabweza zida zathu.
  • Tizigwiritsanso ntchito kapena kuzipereka kwa kampani yobwezeretsanso zomwe zimataya zidazo motsatira malamulo.
  • Kwa mayiko omwe ali kunja kwa EU, mabatire ndi zida ziyenera kutayidwa motsatira malamulo a zinyalala m'dera lanu.
  • Ngati muli ndi mafunso, chonde lemberani PCE InstrumentsPCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (22)

Zambiri za PCE Instruments

Mabuku ogwiritsira ntchito m'zinenero zosiyanasiyana (français, italiano, español, português, nederlands, türk, polski, русский, 中文) angapezeke pogwiritsa ntchito kufufuza kwathu pa: www.pce-instruments.com.

PCE-Instruments-PCE-HT-72-Data-Logger-for-Temperature-and-Humidity-FIG-1 (1)

  • Kusintha komaliza: Seputembara 30, 2020

Zolemba / Zothandizira

Zida za PCE PCE-HT 72 Data Logger ya Kutentha ndi Chinyezi [pdf] Buku Logwiritsa Ntchito
PCE-HT 72 Data Logger ya Kutentha ndi Chinyezi, PCE-HT 72, Data Logger ya Kutentha ndi Chinyezi, Kutentha ndi Chinyezi

Maumboni

Zolemba Zogwirizana

Siyani ndemanga

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