Specifications – Hach-Lange ORBISPHERE Model 51x User Manual User Manual
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Specifications
DIGITAL OUTPUTS
Measurement alarm relays on the
measurement board(s)
Three alarm relays per measurement board
1A-30 VAC or 0.5A-50 VDC on a resistance load
Configurable to Normally Open [NO] or Normally Closed [NC] contacts by changing the 
jumper positions.
WARNING
Potential Electrocution Hazard. Connect only safety low voltage < 33 VAC RMS.
System alarm relay on the main 
board. One system board with 
one system relay per instrument
One "instrument system alarm" relay per instrument 
1A-30 VAC or 0.5A-50 VDC on a resistance load
Normally closed [NC] (NO relay also available) when instrument is turned on. Opens when 
a system alarm is detected, and when it does not receive any signal.
WARNING
Potential Electrocution Hazard. Connect only safety low voltage < 33 VAC RMS.
GENERAL
Thermal cut off
Prevents ageing of sensors when exposed to high temperatures
COMMUNICATION
Options
RS-485 or PROFIBUS-DP (optional)
USB client
USB host
Ethernet 10/100 Base-T 
SIZE AND WEIGHT
Wall and pipe mount 
(H x D x W)
236.5 x 160 x 250 mm - weight 3.8 kg
9.31 x 6.30 x 9.84 ins. - weight 8.38 lbs
Panel mount: Face (housing) 
(H x D x W)
156 (123) x 250 x 220 (214) mm - weight 2.9 kg
6.14 (4.84) x 9.84 x 8.86 (8.43) ins. - weight 6.39 lbs
Portable
(H x D x W)
225 x 250 x 219 mm - weight 3.8 kg
8.86 x 9.84 x 8.62 ins. - weight 8.38 lbs
