Mobrey Hydrastep 2468 Electronic Steam or Water Gauging System
Failure to detect low water levels in steam-raising plant can have costly and potentially disasterous consequences. Reliable water level detection is vital to prevent damage to plant and personnel.
The Mobrey Hydrastep Electronic Gauging System is the ideal "fit and forget" solution to overcome the problems associated with unreliable, maintenance intensive gauge glasses. Designed for totally reliable operation, Hydrastep is both fail-safe and fault tolerant.
The Hydrastep system takes measurements from rugged electrodes fitted to a water column. Red (steam) and green (water) indicators - which can be sited anywhere in the plant - display the water level.
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- High reliability, fault tolerant design
- Very low maintenance requirement
- Accurate water level indication
- Alarm and trip signals available
- 4-20mA level signal available
- Reduced insurance premiums
- Low overall cost of ownership
- Display can be positioned anywhere in the plant
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| Electrode Channels |
8 to 32, in pairs |
Water/Steam Threshold |
0.6 μS/cm (normal) or 1.6 μS/cm (alternate) depending on water purity |
Electrode Cable Length: |
10 ft (3 m), 33 ft (10 m), 60 ft (18 m), or 98 ft (30 m) |
| Fault Detection: |
Electrode connection - open circuit and short circuit to ground |
Channel Fault Indication |
Flashing display segment |
General Fault Indication |
Amber LED |
| Local Display |
Red/green bar graph, 32 LED segments Display blanking from the bottom with less than 32 electrodes in use |
| Outputs |
Drive to remote displays, maximum 6 units is 3280 ft (1000 m) maximum Opto-isolated fault output Analog output (proportional to water level):
| Range: |
0–20 mA or 4–20 mA, forward or reverse |
| Accuracy: |
± 0.2 mA |
| Drive capability: |
600Ω at nominal supply voltage and 500Ω at minimum supply voltage | |
| Optional Output |
Number of output boards that can be fitted: 2 (2468CA/CC) or 4 (2468CB/CD) Relay board 24680504C 4 independent change-over relays
Relays contact rating (ac): |
0–20 mA or 4–20 mA, forward or reverse Maximum current: 8 A Max. switching power: 1500 VA |
Relays contact rating (dc): |
Maximum voltage: 125 V Maximum current: 8A Max. switching power: 240 W < 30 V, 65 W < 60 V, 25 W < 125 V |
| Type N safety |
5 A @ 12 Vdc, 100 mA @ 30 Vdc, 20 mA @ 125V dc |
| Delayed relay board 24680509B |
| Specification as per relay board 24680504C |
| Delay range: |
0 to 25s ±1s |
| Opto-isolated board 24680505A |
| Solid state relays: |
Four independent outputs |
| Rating: |
30 Vdc, 1 A |
| Max. voltage drop: |
1.1 Vdc @ 1 A |
| Max. leakage current: |
1 mA @ 30 Vdc | |
| Power Supply |
| Power supply (ac): |
94 V to 130 V or 187 V to 256 V 48 Hz to 65 Hz 30 VA maximum |
| Power supply (dc): |
20 V to 40 V negative earth or isolated 30 W maximum | |
| Temperature |
| Operating temperature |
–4 to 158 °F (–20 to 70 °C) | |
| Relative Humidity |
Up to 100% |
| Enclosure |
Brushed stainless steel Wall mounting (four point) IP65 / NEMA4X 16.7 in. high x 12.8 in. wide x 6.4 in. deep (425 mm x 325 mm x 163 mm) |
| Weight |
26.4 Ib (12 kg) |
| Approvals |
| LVD: |
EN 61010-1 |
| ATEX: |
II3 G EEx nA IIC T4 (-20°C < ta < +70°C) |
| CSA: |
(Canada) Ex nA [nL] nL IIC T4 (USA) CI. 1 Zn. 2 AEx nA IIC with relay output connected only to energy limited circuits |
| EMC: |
EN 61326 |
| PED: |
Safety accessory | | |
- HP and LP heaters
- Water level

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