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Fig. 4 | BMC Biology

Fig. 4

From: An automated aquatic rack system for rearing marine invertebrates

Fig. 4

a–o Overview of the Walchem 900 controller, main sensors, dosing pumps, and the external chiller. a Walchem 900 controller and touch pad interface. b View inside the Walchem controller showing many electrical connections to the various sensors and dosing pumps, etc. c View of the sensor side loop. Water for the side loop is supplied by the red plastic tubing and passed to the external chiller by the white plastic tubing. d Example showing some of the information provided by the system, which can be viewed online. e View of the RODI water and pH/calcium dosing pumps and their reservoir, which are situated to the right of the rack system. f Close up view of the RODI water and pH/calcium dosing pumps, which are mounted on the wall. g Example of salt creep on one of the drain troughs. h View of the automatic seawater top off (ATO) unit. i View inside the seawater reservoir for the ATO unit showing the small submerged pump and optical water level sensor. j Location of the ATO unit supply line that directs seawater to the back right corner of the sump, just behind the slotted drain diverter. The tubing is secured with a pair of zip ties. Note evidence of salt creep. k View of the external chiller. Water for the chiller is supplied via the sensor side loop. The cold return line is covered with foam insulation. l Close-up view showing the custom fittings and right angle push connectors for the chiller’s water lines (see Additional file 3E). m View of the small window located in the sump, through which one can readily asses the water level. The Nylon mesh bags containing crushed coral can be seen inside the sump. The square magnet that secures the optical water level sensors for the ATO unit is also visible. The dual optical sensors are located inside the sump. n View of the flow meter and various connections to the sump. The food line is seen entering the sump through a small hole drilled in the PVC plastic lid that covers the left compartment. o View of the Echopod ultrasonic water level sensor and other connections to the sump. av., anti-siphon valve; bi, bioreactor return line; bp, bypass valve; cc, mesh bags containing crushed coral; cd, conductivity sensor; ch, chiller; cr, chiller return line; cs, chiller supply line; dp, dosing pumps; fl, feeding line; fm, flow meter; ft., float switch; mb, Nylon mesh basket; os, optical water level sensor; ot, outlet timer switch; pH, pH probe; pHo, pH dosing pump outlet; pHp, pH dosing pump; pm, ATO seawater dosing pump; pv priming valves; re, reservoir; ROo, RODI dosing pump outlet; ROp, RODI water dosing pump; sd, salt deposits; sw, sump window; SWo; seawater dosing pump outlet; tb, tubing from ATO unit; ts, touch screen; us, ultrasonic water level sensor. Other labels are the same as those used in Figs. 1 and 3

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