WIKA Hydra-Dry - Handbuch (Seite 6)

9016333 06/2007
6 WIKA Operating Instructions HYDRA-Dry
Pressure Transducer
HYDRA-Dry
6. Maintenance instructions
HYDRA-Dry pressure measuring systems do not require any maintenance.
Cleaning of the HYDRA-Dry may only be accomplished through rinsing. Any
mechanical cleaning inside the process connection may damage the
separating diaphragms.
The HYDRA double diaphragm system prevents contamination of the process
media even in case of mechanical damage of the wetted diaphragm. In this
case the process media will penetrate the lateral leakage boring. The
instrument must be exchanged as soon as possible.
For safety reasons repairs of already mounted instruments are not possible.
7. Specifications
GB
1) Limited by maximum pressure rating of the process connection see section 3.
Specifications
Pressure ranges bar 0 ... 2.5 0 ... 4 0 ... 6
psi 0 ... 30 0 ... 60 0 ... 100
Overpressure safety of sensor bar 40
1)
Pressure-reference relative pressure, not suitable for vacuum
Wetted parts PFA or TFM (modified PTFE), no transfer-fluid
Power supply UB VDC 12 < UB ≤ 30 (18 ... 30 V with HYDRA-Indicator)
Signal output mA 4 ... 20, 2-wire system
Maximum load R
A
R
A
≤ (U
B - 12 V) / 0.027 A with R
A
in Ohm and UB in Volt
(with HYDRA-Indicator R
A
≤ (UB - 18 V) / 0.027 A)
Accuracy % of span ≤ 0.5
Stability per year % of span ≤ 0.25 (at reference conditions)
Temperature-coefficients % of span / 10 K ≤ 0.25 (from 5°C to 60°C)
Ingress protection IP 67