德国JOLA公司致力于液位控制领域的研发和发展，已有60多年的历史。JOLA产品包括液位控制器,浮动开关，液位传送器及测漏仪等产品。

JOLA产品型号列举：

Capacitive leakage detectors：CPE_LS4, CPE-SPS2, CPE-SPS3, CPE-SPS4,CPE-LS4,CPE-LS4/A,CPE-LS5,CPE-KNI,CPE-KNI/A,OWE-SPS2,OWE-SPS3,OWE-SPS4,OWE-LS4,OWE-LS4/A,OWE-LS5,OWE-KNI,OWE-KNI/A,COW-SPS2,COW-SPS3,COW-SPS4,COW-LS4,COW-LS4/A,COW-LS5,COW-KNI,COW-KNI/A
SSP 3/K/PVC,SSP 1/K/PVC SSP 3/K/RN  SSP 1/K/RN SSP/S3/K/SIL
SSP/S1/K/SIL SSP/S3/K/PUR SSP/S1/K/PUR SSP/S3/K/CM SSP/S1/K/CM
PH 3/K/PVC SPH 1/K/PVC SPH 3/K/RN SPH 1/K/RN SPH/S3/K/SIL SPH/S1/K/SIL SPH/S3/K/PUR SPH/S1/K/PUR SPH/S3/K/CM SPH/S1/K/CM SPH/S3/K/PTFE SPH/S1/K/PTFE SSX 3/K/PVC SSX 1/K/PVC SSX 3/K/RN
SSX 1/K/RN SSX/S3/K/CM SSX/S1/K/CM  SSX/S3/K/PTFE  SSX/S1/K/PTFE
FS 1/K/PVC FS 3/K/RN FS 1/K/RN FS/S3/K/SIL FS/S1/K/SIL FS/S3/K/PUR
FS/S1/K/PUR FS/S3/K/CM FS/S1/K/CM
SPH, SSX, SSR, SS, FS, TS Mercury-free floating switches and immersion probes with potential-free micro-contact
SM SM float switches
SMR SMR magnetically operated float switches
MK MK float switches
TSR, RN, TSM TSR, RN and TSM immersion probes
TSR/Ex TSR EEx immersion probes
NTR Immersion probes with free connecting cable
HMW, HA, NVM, ENVM Magnetic switches; level indicators and level controllers with magnetic switches
TSK-MWU-SKG Continuous liquid level indicators of the TSK-MWU-SKG range
PKG 4-20 Liquid Level Transmitter for continuous level
measurement
SDS/PP SDS/PP pressure head switch
ATNP Level controllers on the air bubble injection principle
EH, LWZ, S, NR, ES Electrode controls
EL/Ex, NR/Ex Electrode controls for use in potentially explosive atmospheres
PST Pump control systems
KR, ESA Protection relays and alarm relays
KR/Ex Intrinsically safe protection relays
RK3/K/external-mounting limit switches
MBK/magnetic switches in protection class“intrinsically safety”
EEx ia IIC T6, T4 or T3