The lnp94 / 1 is the lower cost manually controlled pump which cannot be automatically controlled by the temperature programmer 1是低价手动控制泵,不能自动地由温度控制器控制。
2.
Two liquid nitrogen cooling systems are available . the lnp94 / 2 can be automatically controlled by the temperature programmer or by selecting one of 5 manual pump speeds 可以使用两套液氮冷却系统。 lnp94 / 2可以自动地由温度程序控制器控制,或选择5种手动泵速。