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一、引言我厂继1981年试制成功YWL—500型和YLL—500型气动压力指示调节仪后又试制成功YWL—120型、YLL—120型气动压力指示变送仪、WTL—122型气动温度指示变送仪和WTL—502型、WTL—402型气动
I. INTRODUCTION Following the successful trial production of the YWL-500 and YLL-500 pneumatic pressure indicator regulators in 1981, the YWL-120 and YLL-120 pneumatic pressure indicator transmitters were successfully manufactured. WTL-122 pneumatic temperature Instrumentation transmitter and WTL-502 type, WTL-402 type pneumatic