The ISE IL 943 Flame Photometer is an automatic instrument for the determination of sodium potassium and lithium concentration in serum plasma and aqueous solutions. Sampling calibration zeroing aspiration dilution analysis printing and waste disposal are automatic – controlled by an on-board microcomputer. Other computer-controlled functions include data fuel and air monitoring operator guidance and instrument diagnostics. Cesium standard measures Na K and Li with no need for changeover and provides faster analyses with less salt build-up. Throughputs of up to 100 samples per hour are readily attained STATs are fast and easy. Lithium results are obtained as quickly as Na/K results. The virtually trouble-free aspiration/flame system requires minimal maintenance. The positive-displacement piston dilution system avoids the maintenance problems of peristaltic pumps. It allows analysis of samples as small as 20uL and eliminates the need for large quantities of distilled water. The nebulizer permits stable precise aspiration rate. The integral thermal strip printer lists cup number test type and results or in STAT mode lists the sequence number. The ISE IL 943 Flame Photometer may be ordered with or without built-in printer and automatic sampling system.