Bacharach H25-IR Manual De Usuario

Maintenance 

H25-IR 

 

38

 

Instruction 3015-4342 

The Last Fault screen provides a text description of all current faults that have been detected by the 
instrument. Once the cause of the fault(s) has been cleared, its description is removed from the screen. The 

name of the last fault, however, is retained on the screen. This is useful in determining the cause of an 
intermittent type fault. 

To display the Last Fault screen, first display the Diagnostics menu as described in Section 5.1. Next, use 

the Up and Down buttons to highlight “LAST FAULT” and then press ENT.  If necessary, use the Up and 
Down buttons to scroll through the fault list. A list of possible fault messages is shown below. 

The numbers in brackets “< >” are the fault numerical codes that appear on the Diagnostics Sensor Data 
screen (refer to Section 5.1.1).  

 The fault codes 

appearing on the Sensor Data, Diagnostics 
screen (refer to Section 5.1.1) are additive. For 

example: A fault code of <0810> indicates that 

both a Search Flow Fault <0800> and a Loop 
Open error <0010> have occurred. 

 
Box Temp Error <0001>:

 Enclosure temperature 

is high. Check that the enclosure is not being 

subjected to extreme temperatures. Use the 

Sensor Data screen to check the box temperature  
(refer to Section 5.1.1).  

 
Bench Temp Error <0002>:

 Optical bench 

temperature is high. Check that the enclosure is 

not being subjected to extreme temperatures. 
Use the Sensor Data screen to check the box 

temperature (refer to Section 5.1.1).  

 
Loop Open <0010>:

 The 4−20 mA current loop is 

open, or there is a high resistance in the circuit. 

Check the wiring to the load/monitoring circuit. 
If this feature is not being used, a 100 ohm 
resistor must be connected to the 4−20 mA 

output connector (refer to Section 2.8). 

 
Internal CAL Error <0020>:

 An internal 

calibration failure has occurred. Repeat internal 
calibration procedure per Section 3.2. 

 
External CAL Error <0040>:

 An external calibra-

tion failure has occurred. Repeat external cali-

bration procedure per Section 3.3. 

 
Digipot Range Error <0200>:

 The digital 

potentiometer circuit is out of its normal 

operating range. Call Bacharach Service with 
this information for further instructions. 

 
Leak Pressure Fault <0100>:

 The pressure of the 

internal leak source has dropped below its 

minimum value. Call Bacharach Service with 
this information for further instructions. 

 

 

 A failure has occurred in the 

instrument’s analog-to-digital circuitry. Call 
Bacharach Service with this information for 

further instructions. 

 
Search Flow Fault <0800>:

 This error occurs in 

the search mode when the gas flow through the 

detector has significantly changed. Check that 
the probe connector is plugged into the instru-

ment, the probe hose is not kinked, and the filter 

in the probe tip is not clogged. Also check for a 
blocked internal filter or failed pump. 

 
Measure Flow Fault <1000>:

 This error occurs in 

the measure mode when the gas flow through the 

detector has significantly changed. Check that 
the probe connector is plugged into the instru-

ment, the probe hose is not kinked, and the filter 

in the probe tip is not clogged. Also check for a 
blocked internal filter or failed pump. 

 
No Flow <2000>:

 Gas flow through the detector 

has stopped. Check that the probe hose is not 

kinked, and the filter in the probe tip is not 

clogged. Also check for a blocked internal filter or 
failed pump. 

 
Zero Volt Error <4000>:

 The detector’s output 

voltage may be out of tolerance. Use the Sensor 

Data screen to check the detector voltage (refer 
to Section 5.1.1). Call Bacharach Service with 

this information for further instructions. 

 
A/D Clipping Error <8000>:

 The detector voltage 

may be out of tolerance. Use the Sensor Data 

screen to check the detector voltage (refer to 
Section 5.1.1). Call Bacharach Service with this 

information for further instructions.