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GAS MONITORS
MODELS 2050-00 & 2050-10
MODELS 2060-00 & 2060-10
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Applicability & Effectivity
Sierra Monitor Corporation
1991 T arob Court, Milpit as, CA 95035
(408) 262-6611
(800) 727-4377
E-Mail: sierra@sierramonitor.com
GAS MONITORS
MODELS 2050-00 & 2050-10
MODELS 2060-00 & 2060-10
APPLICABILITY & EFFECTIVITY
This manual provides instructions for the following Sierra Monitor products:
Model Description
2050-00 Ammonia Gas Monitor
2060-00 Halocarbon Gas Monitor
The instructions are effective for the above models as of January 1, 2004
Instruction Manual Part Number: T10013
Rev C
Applicability & Effectivity
Page 3
T ABLE OF CONTENTS
SECTION PAGE
1.PRODUCT DESCRIPTION 1
1.1 Introduction 1
1.2 Application 1
1.3 Configuration 1
1.4 T emperature Range 2
1.5 Sensor 2
1.6 Remote Alarm 2
2. QUICK ST ART 3
2.1 Overview 3
2.2 Wiring 3
3. OPERA TION 4
3.1 Introduction 4
3.2 Alarms 4
3.3 Outputs 4
4. ALARM CALIBRATION 5
4.1 Factory Alarm Calibration 5
4.2 Frequency of Alarm Calibration Check 5
4.3 Alarm Calibration Check Process 5
4.4 Equipment Required 6
4.5 Alarm Calibration Procedure 6
5. SERVICE
5.1 Sensor Replacement 7
6. INST ALLATION 8
6.1 Gas Sensor Module Locations 8
6.2 Mounting 8
6.3 Wiring 8
6.4 Power Supply 8
6.5 Alarm Devices 8
7. ALARM CONFIGURATION 10
8. SPECIFICA TIONS 11
9. ACCESSORIES AND REPLACEMENT P ARTS 11
10. LIMITED WARRANTY 11
Table of Contents
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Instruction Manual
1.0 PRODUCT DESCRIPTION
1.1 Introduction
The Model 2050 Ammonia and Model 2060 Refrigerant/
Halocarbon Gas Monitors are continuous duty , low cost
stationary monitors for detection of high levels (50-500
PPM) of ammonia and halocarbon ("freons") refrigerant
gases. See the specifications page for a full list of available applicable halocarbons
This manual provides instructions for both the 2050 and
2060 series Gas Monitors, including the relay versions.
1.2 Application
These monitors are primarily used in and around freezers, refrigerators, and compressor rooms to warn of leaks
and dangerous levels of these gases.
1.3 Configuration
An alarm is activated when the concentration of gas
exceeds the user-adjustable level. An alarm condition
activates the alarm light on the front of the monitor and
generates an output signal. On Models 2050-00 and the
2060-00 the output signal a TTL (Transistor-Transistor-Logic signal) can activate a remote alarm through
one of Sierra Monitor’s Alarm Panels. (The Model 2102
Dual Channel Alarm Panel can be connected up to 500
feet from the monitors. ) The models can be configured with a 0.5 amp, dry contact relay.
Model Gas TTL Relay
2050-00 Ammonia X X
2060-00 Halocarbons X X
Table 1.1 Gas Monitor Configurations
factory setpoint for R12 is 500 ppm while the setpoint
for R134 a is 50 ppm. See the specifications for more
details.
The Model 2050 / 2060 is cross sensitive to other combustible gases. If combustible gasses in excess of 50
ppm are expected in the area please contact Sierra Monitor to determine amount of cross-sensitivity expected
for the specific combustible gas. It is not recommended
to use this unit in areas with combustible gases present.
The monitors are housed in a
polystyrene enclosure that is suitable for installation in freezer, refrigerator or other applications.
Test connections and adjustment
controls are located on the outside of the enclosure and are easily used, even when the operator
is wearing hand protection.
The Model 2050 Ammonia monitor has a factory alarm setpoint of
100 ppm NH3. This setpoint is
user adjustible in the field over a
range of 50 to 500 ppm NH3. The
Model 2050 calibration can be
checked with Hydrogen gas.
The Model 2060 Halocarbon
monitor can be calibrated with
carbon monoxide and the factory
setpoint varies for the specific
type of halocarbon present. The
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Figure 1.1 Outline View - 2050/2060 Series
2050/2060 Gas Monitors (5/04)
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1.4 Temperature Range
The Model 2050 and 2060 have temperature compensated circuitry to provide stabilization in temperatures
ranging from -4o to 158oF.
However, for optimum operation the unit should be calibrated at the normal temperature expected for the sensor
location.
1.5 Semiconductor-T ype Sensor
A solid-state semiconductor-type sensor and associated electronic circuitry ensure trouble-free, long-term
operation. All the electronic circuitry needed to operate
the monitor, except the DC input power , is contained in a
compact unit. There are no pumps, filters, or chemical
cells to replace or maintain. Except for periodic calibration to verify the alarm setting, no attention is required
after installation. The user may adjust the alarm level by
applying a different calibration gas concentration.
Instruction Manual
A sensor self-check feature will flash the alarms on and
off alternatively should the sensor fail (open circuit).
The alarm flash includes LEDs, audible alarm, relay or
alarm signal as applicable.
1.6. Remote Alarm A vailable
If a remote alarm is desired, Sierra Monitor’s Alarm Panels, the Model 2102 Dual Channel Alarm Panels can be
connected up to 500 feet away from the monitors.
2050/2060 Gas Monitors (5/04)
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Instruction Manual
2.0 QUICK ST ART
2.1 Overview
The Gas Sensor Module has been supplied factory
calibrated and ready for immediate installation and
operation. An inst aller familiar with installation and
operation of gas detection products can use this
section to begin immediate use of the monitor.
2.2 Wiring
Each module requires four-conductor wiring (two
wires for power and two wires for the signal).
2.2.1. Model 2050-2060 Series
The Model 2050-2060 series are designed to
mount on any indoor vertical surface. Mount
the monitor in the desired location.
- The installation must meet any hazardous environmental codes for AC/DC electrical instrumentation.
2.2.2 Wiring Connection
T erminal positions on the electronics board are
as follows:
During warm-up the monitor will, first, cycle
through safe/alarm/safe condition at one hertz.
This will be followed by a short period of continuous alarm before warm-up is completed.
2.2.4 Configuration
The default configuration for each module is to
operate with a buzzer and a normally operating
open (NOO) relay . The user can change this configuration using the jumpers provided. Refer to
table 6.2.
Terminal Function
TB1-1 + VDC (9 – 24)
TB1-2 GND (0VDC)
TB2-1 Relay NC (Normally Closed) or
Output to Model 2102 Safe
TB2-2 Relay Comm on
TB2-3 Relay NO (Normally Open) or
Output to Model 2102 Alarm
Table 2.1
2.2.3 Start-up & Operation
To begin operation of the Gas Sensor Module
provide 9 - 24 VDC from a regulated power
supply such as one of the Sierra Monitor Alarm
Panels, 2102-XX. Each time the sensor module is powered up it will perform a warm-up for
2 - 60 minutes.
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2050/2060 Gas Monitors (5/04)
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3.0 OPERA TION
Instruction Manual
3.1 Introduction
Under normal conditions the gas sensor module does
not require operator or technician intervention. The
following are conditions under which the module requires attention:
- Routine periodic calibration
- Sensor replacement on a planned schedule
or when a sensor failure occurs.
- Periodic cleaning as necessary .
3.2 Alarms
Three alarm conditions are possible. These can be
detected visually at the optional Sierra Monitor controller and at the module.
Warm-Up Alarm
Oscillating (On/Off) contact closure and “red/
green” visual indication when power is first connected to the module, followed by a continuous
closure of approximately 2-60 minutes indicating warm-up.
Buzzer Relay Relay
Fail Safe
On/Off Oscilating Oscilating
Gas Alarm
Trouble Alarm
Interrupted contact closure and “red/green” visual indication (once the warm-up time is completed) after unit has been in operation, indicating either a failed sensor or calibration problems.
Buzzer Relay Relay
Fail Safe
On/Off Oscilating Oscilating
3.3 Outputs
For the non-relay configurations a 5 volt DC TTL
signal is provided to activate remote alarms such
as the Sierra Monitor Alarm Panels. Relay configuration alarm conditions described above are transmitted to the annunciator as relay contact closures
from the monitor.
The alarm outputs are non-latching closed contacts.
As soon as the gas concentration falls below the
alarm set-point, the alarm will stop and the alarm
output will cause the relay to de-energize and the
contacts will open.
During warm-up and failed sensor alarms the relays contact and the display LED's oscillate at approximately one hertz.
Sustained contact closure and solid red light
(once the warm-up time is completed) indicating the presence of gas at, or above, the pre-set
alarm limit.
T able 2.1
Buzzer Relay Relay
On Closed Open
2050/2060 Gas Monitors (5/04)
=
Fail Safe
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Instruction Manual
4.0 ALARM CALIBRATION
4.1 Factory Alarm Calibration
The module has been factory calibrated to alarm as
indicated in Table 4.1 and as marked on the calibration label shipped with the module.
Model Time Gas cc/min
2050-XX 100 sec. 100 ppm NH350
2060-XX 60 sec. 500 ppm R11 50
500 ppm R12 50
50 ppm R22 5 0
100 ppm R113 5 0
70 ppm R123 50
50 ppm R134a 50
40 ppm R141b 5 0
40 ppm R142b 5 0
40 ppm R500 50
70 ppm R502 50
T able 4.1
4.2 Frequency of Alarm Calibration Check
The manufacturer recommends that the calibration
of each gas sensor module be verified monthly during the first three months of operation and then quarterly. More frequent checks are necessary during
periods of extreme humidity and temperature
changes. The monitor should have operated continuously (uninterrupted) for at least 24 hours prior
to calibration adjustment.
4.3 Alarm Calibration Check Process
The output signal of the gas sensor module is calibrated
using a calibration gas mixture containing a known
concentration of the gas of interest and a balance of air,
or using a substitute gas. The concentration of the span
gas must be equal to the alarm point desired.
The equivalent substitute gas is 80 ppm Hydrogen (H2)
for the Model 2050 and 150 ppm Carbon Monoxide
(CO) for the Model 2060.
Calibration requires application of the span gas to the
sensor and adjustment of the sensitivity adjustment potentiometer.
Warning: During calibration the alarm will turn on and
remote alarms connected to the alarm relays will be
activated. Disable the remote alarm if necessary .
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Fig. 4-1 Location of Calibration Voltmeter Connections and Adjustments
5
2050/2060 Gas Monitors (5/04)
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4.4 Equipment Required
The following tools and equipment will be required for
calibration:
- Jewelers Screwdriver
- Calibration Gas
- Calibration gas delivery system
For accurate calibration use a gas mixture at the required concentration mixed in an air balance, rather
than with an inert gas like nitrogen. This gas and the
required delivery equipment such as the Model 120026 Calibrator is available from Sierra Monitor Corporation.
4.5 Alarm Calibration Procedure
1 . The monitor should be in the safe condition prior
to calibration (green LED “ON”).
- Be sure that the area is non-hazardous before proceeding.
Instruction Manual
2 . With the monitor in operation, expose the sensor
to a sample of calibration gas. Apply calibration
gas directly to the sensor insuring that the delivery
cup loosely covers the sensor. Use 80 PPM H2 for
the Model 2050 and 150 PPM CO for the Model
2060.
3. The red LED on the face of the monitor should turn
"on". If the alarm occurs within 18-20 seconds and
stops within one minute of the removal of the calibration gas, the monitor is in calibration and requires no further adjustment.
4 . If the monitor fails to alarm within 90 seconds of
the application of the gas adjust the potentiometer
counter clockwise until the alarm turns "on".
5. If the monitor fails to stop alarming within one
minute of the removal of the gas adjust the potentiometer clockwise until the alarm stops.
6. After adjustment, repeat steps 4 and 5 to verify calibration.
7 . When the calibration is complete, reconnect any
alarm equipment as necessary .
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Instruction Manual
5.0 SERVICE
5.1 Sensor Replacement
The gas sensor needs replacement when:
- It is no longer possible to obtain correct
calibration
- The failed sensor alarm (oscillating
red/green LED) is on
- The sensor output signal is noisy,
causing incorrect gas alarms.
T o replace the sensor:
1. Confirm that the system power has been
removed.
2. Remove the cover from the main enclosure.
3. Unplug the sensor connector on the lower
right hand corner of the electronics board.
4. Unscrew the sensor assembly from the end of the
enclosure.
5. Reverse the preceding steps to install the new sensor assembly .
6 . Restore power and allow a minimum of 24 hours
for stabilization before recalibration. The calibration should be re-verified after 6 days of continuous operation.
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Figure 5-1 Model 2050/2060 Electronics Board Connections
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2050/2060 Gas Monitors (5/04)
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6.0 INST ALLA TION
Instruction Manual
6.1 Gas Sensor Module Locations
The gas sensor module is a diffusion type sensor
that should be located close to the anticipated source
or destination of the gas hazard. For heavy gases
such as H
the ground. For lighter gases such as CO and combustible gases use a higher elevation.
After optimum locations are determined based on
the above recommendations, consideration should
be given to placing the sensors in locations that are
accessible for calibration service. Slight adjustments
to the location of the sensor may have little impact
on effectivity but major effect on accessibility .
6.2 Mounting
T o mount the monitor , remove the four svrews in the
cover plate and move the cover plate aside. Use
screws through the monitoring holes visible in the
four corners of the housing to mount the monitor to
a wall.
- The installation must meed any hazardous environmental codes for AC/DC electrical instrumentation.
S install the module within 24 inches of
2
6.4 Power Supply
The power supplied by the controlling device or an
external power supply must meet the following specifications:
Volt age:9 - 24 VDC
Current:250 mA
6.5 Alarm Devices
The internal relay is rated at 0.5 Amp, normally open
dry contact rated at 100 VDC/130 VAC.
6.3 Wiring
Interconnect wiring from the controller to the module
is by 4 conductor 22 AWG (or lower AWG) cable,
conduit as necessary. Shielding is not required.
For installations where the distance from the controller to the sensor is greater than 500 feet, 18
AWG cable is recommended.
Terminal Function
TB1-1 + VDC (9 – 24)
TB1-2 GND (0VDC)
TB2-1 Relay NC (Normally Closed) or
Output to Model 2102 Safe
TB2-2 Relay Common
TB2-3 Relay NO (Normally Open) or
Output to Model 2102 Alarm
Table 6.1
The terminal strip on the electronics board in the
module. The wiring must be connected as indicated in Figure 6.1 depending upon the controller
or relay configuration being used.
2050/2060 Gas Monitors (5/04)
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Instruction Manual
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Figure 6.1
Interconnect Wiring T able
9
2050/2060 Gas Monitors (5/04)
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y Op
y Op
7.0 ALARM CONFIGURATION
Mo de l 20X or 200X C onfig ure d wi th Ala rm Rel a y O utpu t
Buzzer Active
Yes No
Default
Install Jumper
JP6
TB1-1 TB1-2 TB2-1 TB2-2
+ DCV
(9-24 V D C )
Mo del 20X or 200X Co nfigu re d for In terfa ce to M o del 2102 Alarm P an e l
Yes No
Default Default
Install Jumper
JP6
Remove Jumper
(Bes t for 20X)
Power S upply
Buzzer Active Relay Operation Interface Selection
Remove Jumper
(Bes t for 20X)
JP 6
0 DC
Common
JP 6
Configuration Jum pers
Relay Ope ration
Norma lly
Not E nergized
Default
Install Jumper
JP2 pins 1-2
W iring Termina tions
Output Terminals
NC Comm on
Configuration Jum pers
Norm ally
Not E nergized
N/A N/A
Normally
Energized
Instruction Manual
Normally
Energize d
Install Jumper
JP2 pins 2-3
TB2-3
NO
Model 2102
Install Jum pers
JP3 pins 1-2
JP2 pins 1-2
W iring Termina tions
Power S upply
TB1-1 TB1-2 TB2-1 TB2-3
+ DCV
To Model 2102
Term in a l J5 -2
or J6-2
0 DC
To Model 2102
Term i na l J5 -3
or J6-3
Jumpe r Configuration and W iring Term inations
Safe
To Model 2102
Term i na l J5 -1
or J6-1
Table 6.2
Rela
Terminal J5 -4 or
eration
Nor m a lly No t En e r g ize d
TB2-1 NC TB2-2 Common TB2-3 NO
No P o we r Ope n
Sensor Fail
Safe Open
Connec ted
Oscillating
Connec ted
Alarm Open
Normally Energized - Fail Safe
TB2-1 NC TB2-2 Common TB2-3 NO
No P o we r Ope n
Sensor Fail
Connec ted
Oscillating
Safe Open
Alarm Open
Connec ted
Table 6.3
Rela
erating States
Output Terminals
TB2-2
Alarm
To Model 2102
Not Used
J6-4
Connected
Connected
2050/2060 Gas Monitors (5/04)
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Instruction Manual
8.0 SPECIFICA TIONS
Indicators: Green LED for Monitor “ON”/Safe
Red LED for Alarm
Sensor Type: Solid-state metal oxide semiconduc-
tor
Alarm Setpoint::
2050 Series 100 ppm NH
2060 Series R1 1 500 ppm
R1 2 500 ppm
R2 2 50 ppm
R113 100 ppm
R123 70 ppm
R134a 50 ppm
R141b 40 ppm
R142b 40 ppm
R500 40 ppm
R502 70 ppm
User adjustable with calibration over
range of 50 to 500 ppm
9.0 ACCESSORIES AND REPLACEMENT P ARTS
3
Calibration Gas:
2050 Series 80 ppm Hydrogen (H2)
2060 Series 150 ppm Carbon Monoxide (CO)
Power: 9 VDC, 250 mA
Signal Output::
2050-00/2060-00 Nominal 5 volt DC, source 25 mA.
SAFE and ALARM Signals
0.5 AMP dry contact, 100 VDC, 130
VAC
Response Time: Less than 90 seconds
Operating T emperature Range:
-4o to 158oF (-20o to 70oC)
Enclosure Material: Polystyrene
Size: 5.6 x 3.1 x 2.1 in.
(14.2 x 7.9 x 5.3 cm)
Weight: 0.3 lb (0.15 Kg)
Alarm Panels
Model 2102-00 Alarm Panel - 2 channel
Model 2102-01 Alarm Panel - 2 channel with audible
Calibration Accessories
1200-26 Gas Sensor Calibrator w/2 gas cylinders
(specify gas type/conc)
1290-10 Gas Cylinder - Carbon Monoxide 150 PPM
1290-11 Gas Cylinder - Hydrogen 80 PPM
10.0 LIMITED WARRANTY
SIERRA MONIT OR CORPORATION warrant s its products
to be free from defects in workmanship or material under
normal use and service for two year after date of shipment.
SMC will repair or replace without charge any equipment
found to be defective during the warranty period. Final
determination of the nature and responsibility for defective
or damaged equipment will be made by SMC personnel.
All warranties hereunder are contingent upon proper use in
the application for which the product was intended and do
not cover products which have been modified or repaired
without SMC approval or which have been subjected to
accident, improper maintenance, installation or application,
or on which original identification marks have been removed or altered. This Limited Warranty also will not apply
to interconnecting cables or wires, consumables (ie. calibration gases, batteries), nor to any damage resulting from battery leakage.
Replacement parts
SPF22073 Sensor for 2050-XX
SPF22074 Sensor for 2060-XX
In all cases SMC’s responsibility and liability under this
warranty shall be limited to the cost of the equipment. The
purchaser must obtain shipping instructions for the prepaid
return of any item under this warranty provision and compliance with such instruction shall be a condition of this
warranty .
Except for the express warranty stated above, SMC disclaims
all warranties with regard to the products sold hereunder
including all implied warranties of merchantability and fitness and the express warranties stated herein are in lieu of all
obligations or liabilities on the part of SMC for damages
including but not limited to consequential damages arising
out of/or in connection with the use or performance of the
product.
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2050/2060 Gas Monitors (5/04)
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