一、概况 Ⅰ、Survey The Model WTZ-288 Electric Contact Thermometer is designed to take measurement and control of the temperature ranging from -20℃ to 120℃ in non-corrosive site within a distance of 16 m. With the application of working principle of pressure-type thermometer, the WTZ-288 is featured by being simple structure, easy to use and at moderate price. Figure 1. Outside View Ⅱ、Main Technical Parameters 1.Temperature Mark & Measuring Range（℃）： Mark Range -20～+60 0～100 20～120 Measuring Range 20～60 40～100 60～120 2.Indicative Accuracy：1.5（About Measuring Range） 3.Extra Pipe size (m): 3,5,10,16.(If not mention when order, we will make the pipe 5m long) 4.Electric Contact capability： (1) Contact form：lower and upper limit； (2) Contact capacity:10VA（without reactance） (3) Connecting Diagram: refer figure 2； (4) Control estate explain: refer chart 1 Figure 2 Connecting Diagram Chart 1 Control mode Measured temperature Functional mode of contacts Lower and upper limits Below lower limit 1-2 3-2 open close Between lower and upper limits 1-2 3-2 open open Above upperlimit 1-2 3-2 close open Ⅲ、Recommended added circuit The power rating of each electric contact in the WTZ-288 is only 10VA without reactance, so users have to resolve the problem of the contact power magnification. For your convenience, we would rather recommend you a power magnification circuit with anti-oscillation and arc extinction (refer to figure 3). Circuit Feature: Once the lower limit contact closes, the lower limit circuit gets self-locked. Only dose the upper limit contact close, the ower limit circuit unlocks. Therefore, the electric contacts are well –protected. Figure 3 Circuit WTZ-288 Electric Contact Thermometer Manual Hangzhou Huali Instrument Co., Ltd Address:27 Longwu Industrial Zone, Hangzhou Telphone:0571-87423833(exchange) 0571-87423675 Marketing Tel:0571-87088120 Marketing Fax:87919920 Fax:0571-87423522 Post code:310024 E-mail:lanshan@mail.hz.zj.cn Http://www.hz-hlyb.com
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