DIY Constant-temperature Coloring Tanks
自制恒温着色槽：从温控棒到绝热槽体
标签：恒温槽, 自制设备, 温控, PID, 着色槽
硫化着色对液温极敏感（液温每升高 1 °C 约使 L* 下降 1–2），自制恒温槽成本不到商品机的三分之一：以 30 L PP 塑料箱为槽体，配 300 W 不锈钢 PTC 加热棒与 ±1 °C 温控器，探头置于液面下半部；底部铺气盘石微曝气使浓度均匀，外壁包 10 mm 橡塑保温板并加 PVC 外罩。调试要点：先注清水空载运行 2 h 校验温控过冲（应小于 2 °C），再以实件测负载曲线；硫化液控 20±1 °C，氨液 22±1 °C。探头每季度校验一次，偏差超 1 °C 即更换。
Sulfide baths are hyper-sensitive to temperature (each +1 °C drops L* by 1–2), and a DIY thermostatted tank costs a third of a commercial unit: use a 30 L PP box, a 300 W stainless PTC heater with a ±1 °C controller probing mid-depth, fine-bubble aeration at the bottom for bath uniformity, and 10 mm rubber insulation under a PVC shroud. Commission it by running 2 h water-only to check overshoot (under 2 °C), then log the loaded curve. Hold sulfide at 20±1 °C and ammonia baths at 22±1 °C; verify the probe quarterly and replace it past 1 °C drift.