Bacharach H25-IR Specifications download pdf (Page 44)

Maintenance H25-IR

38 Instruction 3015-4342

5.1.2 Last Fault

The Last Fault screen provides a text description of all current faults being 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 fault messages along with possible causes and remedies for the

fault 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).

TIP: The Last Fault screen can be cleared of all faults per Section “5.1.6 Clear Last Fault”.

Fault Codes are Additive: 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 calibra-

tion 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>: A low pressure

condition within the internal leak source has been

detected, possibly due to the leak source being out

of gas. Check that the box temperature sensor is

properly calibrated per Section 5.2.6.3. If leak

source is empty, call Bacharach Service.

A/D Failure <0400>: 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 instrument, 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 instrument, 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.

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Bacharach H25-IR Specifications Page 44

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